Glossary

Acoustics
The science of sound and sound control. Adhesion - The property of a coating or sealant to bond to the surface to which it is applied.

Adhesive Failure
Loss of bond of a coating or sealant from the surface to which it was applied.

Air Infiltration
The amount of air leaking in and out of a building through cracks in walls, windows and doors.

Adobe
Unfired brick dried in the sun, commonly used for building in the American Southwest, Spain, and Latin America. Usually covered with stucco in home building.

Adhesion
The property of a coating or sealant to bond to the surface to which it is applied.
Adhesive Failure - Loss of bond of a coating or sealant from the surface to which it was applied.

Air Infiltration
The amount of air leaking in and out of a building through cracks in walls, windows and doors.

Air Side
In reference to float glass, the side that was up or exposed to the "air" when it was manufactured. The bottom side is referred to as the "tin" side because it floated on a liquid tin bath. Coatings are applied to the air side.

Annealed
Raw glass with low, residual stresses. This enables cutting and fabrication.

Annealing
In the manufacturing of float glass, it is the process of controlled cooling done in a lehr to prevent residual stresses in the glass. Re-annealing is the process of removing objectionable stresses in glass by re-heating to a suitable temperature followed by controlled cooling.

Annealing Lehr
An in-line, controlled heating/cooling apparatus located after the tin bath and before the cooling conveyor of a float glass production line. Its purpose is to relieve induced stress from the flat glass product to allow normal cold end processing.


Anti-Walk Blocks

Elastomeric blocks that limits lateral glass movement in the glazing channel, which may result from thermal, seismic, wind load effects, building movement, and other forces that may apply.

Argon Gas
An invisible, non toxic gas used in insulating units to enhance the units insulating performance (u-value).

Aspect Ratio
The quotient of the long side of a glazing lite over the short side of that lite.
Arch - The curved or pointed top on a door or open entryway. Arches come in many different shapes and styles.

Art Nouveau
A style of architecture and interior decorating of the late 1800s and marked by the overly ornate use of undulating imagery, such as waves, flames, flower stalks, and flowing hair.

Art Deco
A popular design style of the 1920s and 1930s characterized by bold outlines, and geometric and zigzag forms.

Atrium
An inner courtyard of a house or building that is open to the sky or covered by a skylight.

Autoclave
A vessel that employs high pressure and heat. In the glass industry, used to produce a bond between glass and PVB or urethane sheets, thus creating a laminated glass product Backer Rod - A polyethylene or polyurethane foam material installed under compression and used to control sealant joint depth, provide a surface for sealant tooling, serve as a bond breaker to prevent three-sided adhesion, and provide an hour-glass contour of the finished bead.

Bead
An applied sealant in a joint irrespective of the method of application, such as caulking bead, glazing bead, etc. Also a molding or stop used to hold glass or panels in position.

Bent Glass
Flat glass that has been shaped while hot into curved shapes.

Bevel of Compound Bead
In glazing, a bead of compound applied to provide a slanted top surface so that water will drain away from the glass or panel.

Beveling
The process of edge finishing flat glass to a bevel angle.

Bite
The dimension by which the framing system overlaps the edge of the glazing infill.

Balcony
Platform projecting from a wall, enclosed by a railing or balustrade, supported on brackets or cantilevered outward.

Baluster - Short post or pillar in a series that supports a rail, thus forming a balustrade. May be curved or straight.

Barrel Tiles
Rounded clay roof tiles most often used on Spanish-style houses. Usually red but available in many colors.

Bay, Bow and Oriel Windows
Windows that project out from the front or side of a house. Oriel windows generally project from an upper story, supported by a bracket. Bay windows are angled projections that rise up from the ground on the first floor. Bow windows are rounded projections, often formed of the window glass itself.

Bead Molding
Small, cylindrical molding enriched with ornaments resembling a string of beads.

Blast Resistant Glass
A laminated glazing construction commonly specified to mitigate injuries from flying glass resulting from an air-blast explosive. Breather Tube Units - An insulating glass unit with a tube and/or hole factory-placed into the unit’s spacer to accommodate pressure differences encountered in shipping due to change in elevation. The tube and/or hole are to be properly sealed on the jobsite prior to unit installation. Consult IG unit fabricator.

Bubbles
In laminated glass, a gas pocket in the interlayer material or between the glass and the interlayer. In float glass, a gaseous inclusion greater than 1/32" (.8 mm) in diameter.

Bubbling
Open or closed pockets in a sealant caused by release, production, or expansion of gasses.

Bulb Edge
In float glass manufacture, the extreme lateral edge of the ribbon as drawn.

Bullet Resistant Glass
A multiple lamination of glass or glass and plastic that is designed to resist penetration from medium-to-super-power small arms and high-power rifles.

Buttering
Application of sealant or compound to the flat surface of some member before placing the member in position, such as the buttering of a removable stop before fastening the stop in place.

Butt Glazed
The installation of glass products where the vertical glass edges are without structural supporting mullions.

Bonus Room
Returns house plans with any space that can be finished after construction of a house is completed. Most often located over a garage or in an unfinished daylight basement, and consequently, not included in the total square footage listed on the house plan.

Bracket
Small supporting piece of wood or stone, designed to bear a projected weight, such as a window. Often in the shape of scrolls or other decorative forms.

Breezeway
Returns house plans with a covered portion of open space that connects a detached garage to the main house. This can be as narrow as a hallway or be wide enough to create a comfortable outdoor living space.

Butler's Pantry
Returns house plans with a space that is located between the kitchen and dining room, and features cabinets and, typically, a serving area that serves as a staging area to the dining room. Amenities, such as a wine refrigerator, warming drawers, china storage, are often included.

Butyl
Shortened term for polyisobutylene. The primary seal of an insulating unit and key component in restricting moisture vapor transmission.

Capillary Tube
A small tube factory-placed into the air spacer of an insulating unit used for balancing interior and exterior pressures during transportation over higher elevations, i.e. mountain ranges or air transport. Caulk - (v) The application of a sealant to a joint, crack or crevice. (n) A compound used for sealing that has minimum joint movement capability; sometimes called low performance sealant.

Canopy
Projection or hood over a door, window, niche, etc.

Cantilever
Horizontal projection from a building, such as a step, balcony, beam, or canopy, that is without external bracing and appears to be self-supporting.

Capital
Head or crowning feature of a column.

Carport
Returns house plans with a garage without walls. A very economical way to protect you and your car from the elements.

Casement Window
Metal or wooden window that opens outward or inward.

Castellated
Decorated with battlements (a parapet with alternating indentations and raised portions); also called crenellation. Buildings with battlements are usually brick or stone.

Ceramic Frit
A ceramic frit enamel applied to glass for decorative/aesthetic appearances. Applied with a large roller for full coverage applications or through a screen for silk-screening applications. Channel Glazing - The installation of glass products into U-shaped glazing channels. The channels may have fixed stops; however, at least one glazing stop on one edge must be removable.

Channel Width
The distance between opposing glazing stops.

Checks
Very small cracks in flat glass, usually at the edge.

Chemically Strengthened Glass
Glass that has been strengthened by ion-exchange to produce a compressive stress layer at the treated surface.

Chipped Edge
An imperfection due to breakage of a small fragment from the cut edge of the glass. Generally this is not serious except in heat absorbing glass.

Clips
Wire spring devices used to hold glass in rabbeted sash, without stops, and face glazed.

Coated Glass
A general reference to any glass incorporating a reflective or low-e coating.

Cohesive Failure
Internal splitting of a compound resulting from over-stressing of the compound.

Consistency
Degree of softness or firmness of a compound as supplied in the container and varying according to method of application, such as gun, knife, tool, etc.

Compound
A chemical formulation of ingredients used to produce a caulking, elastomeric joint sealant, etc.

Condensation
The appearance of moisture (water vapor) on the surface of an object caused by warm moist air coming into contact with a colder object.

Ceramic Tile
Any of a wide range of sturdy floor and wall tiles made from fired clay and set with grout. May be glazed or unglazed. Colors and finishes vary. May be used indoors or out.

Chair Rail Molding
Wooden molding placed along the lower part of the wall to prevent chairs, when pushed back, from damaging the wall. Also used as decoration.

Clapboard
Overlapping horizontal boards that cover the timber-framed wall of a house.

Clerestory Window
Window (usually narrow) placed in the upper walls of a room, usually at an angle, to provide extra light.

Concrete
Cement mixed with coarse and fine aggregate (pebbles, crushed stone, and brick), sand and water in specific proportions. Available in three types: precast, reinforced, and prestressed.

Conventionally Glazed
A framing system that captures the glazing component in the glazing channel.

Corinthian Column
in classical architecture, a column decorated at the top with a mixed bag of curlicues, scrolls, and other lavish ornamentation.

Cornice
Any projecting ornamental molding that finishes or crowns the top of a building, wall, arch, etc.

Covered Front Porch
Returns house plans with porches big enough to accommodate two or more chairs. (Porches that are covered just enough to temporarily protect you from the elements have been excluded from this definition.)

Courtyard
Returns house plans with a broad expanse in the front or rear. Often the focal point of the home and adorned with features like a fountain.

Cove molding
large concave molding produced by the sloped or arched junction of a wall and ceiling. Popular accent for dramatic living rooms.

Covered Rear Porch
Returns house plans with a space similar to a covered front porch but attached to the rear of the house. Includes house plans with a covered back porch large enough to provide ample escape from the elements, plus a protected spot for your barbecue.

Cupola
Dome, especially a small dome on a circular or polygonal base crowning a roof or turret. Usually only decorative in modern homes. (Older cupolas, typically, are accessible by stairs.)

Crush
A lightly pitted area on glass resulting in a dull gray appearance.

Cullet
Broken glass, excess glass from a previous melt or edges trimmed off when cutting glass to size. Cullet is an essential ingredient in the raw batch in glass-making because it facilitates melting.

Cut Sizes
Glass cut to specified width and length.Deflection (framing member) The amount of bending movement of any part of a structural member perpendicular to the axis of the member under an applied load.

Deflection (center of glass)
The amount of bending movement of the center of a glass lite perpendicular to the plane of the glass surface under an applied load.

Delamination
An unbonded area in laminated glass between glass and PVB.

Design Pressure
Specified pressure a product is designed to withstand.

Diffusing
Scattering, dispersing, as the tendency to eliminate a direct beam of light.

Digs
Deep, short scratches.

Distortion
Waviness imparted to horizontal heat-treated glass while the glass is transported through the furnace on a roller conveyor. The waves produce a distortion when the glass is viewed in reflection.

Desiccant
Small, extremely porous beads used to absorb moisture in the sealed air spacer of an insulating unit.

Daylight Basement
Returns house plans with a full or partial basement well-suited for sloping lots. Can either be partially above ground, allowing larger windows exposed to daylight, or a walk-out basement that, typically, has a door leading to a walkway or lower patio.

Den/Office Computer
Returns house plans with a private room that can be closed off from household traffic or serve as the location of the family computer. Also returns house plans for a computer alcove for children that is becoming increasingly more popular.

Detatched Garage
Returns house plans with a garage not connected to the house, regardless of its location. Often connected to the house with an open breezeway.

Distortion
General areas of optical deviation or image deformation as seen looking at the glass.

Double Glazing
In general, any use of two lites of glass, separated by an air space, within an opening, to improve insulation against heat transfer and/or sound transmission. In insulating glass units the air between the glass sheets is thoroughly dried and the space is sealed, eliminating possible condensation and providing superior insulating properties.

Dry Glazing
Also called compression glazing, a term used to describe various means of sealing monolithic and insulating glass in the supporting framing system with synthetic rubber and other elastomeric gasket materials.

Dry Seal
Accomplishment of weather seal between glass and sash by use of strips or gaskets of Neoprene, EPDM, silicone or other flexible material. A dry seal may not be completely watertight.

Double Laminated Insulating Glass
An insulating glass unit in which both the interior and exterior components are a laminated glass.

Dome
Arched roof or ceiling of a uniform curvature erected on a circular or square base. Domes can be segmented, semicircular, pointed, or bulbous. Often decorated with stained or painted glass. Adds light, color, and drama to a room or foyer.

Doric Column
Greek-style column with only a simple decoration around the top, usually a smooth or slightly rounded band of wood, stone, or plaster.

Dormer Window
Window placed vertically in a sloping roof that has a tiny roof of its own. Most often seen in second-floor bedrooms.

Eaves
Under part of a sloping roof that hangs over a wall.

Ell
Single-story lean-to wing of a building that usually contains a kitchen. Added to many houses with wooden frameworks in New England.

Empty Nester
Returns house plans for homes that are focused on those of us who's children have grown and moved out. All of the bedrooms are no longer needed or, at the least, ready access to them. So more attention is given to more elegant master suites, main floor dens, centrally located great rooms, etc. Some returned house plans have all secondary bedrooms in a daylight basement for visiting family members.

Etch
To alter the surface of glass with hydrofluoric acid or other caustic agents. Permanent etching of glass may occur from alkali and other runoff from surrounding building materials.

European U-Value (formerly K-Value)
Based on ISO-DP10292 draft standard conditions. It is based on an outdoor temperature of 5.5°C, and indoor temperature of 20.5°C and a 4.8 m/s outdoor air velocity Exterior Glazed - Glazing infills set from the exterior of the building.

Exterior Stop
The molding or bead that holds the lite or panel in place when it is on the exterior side of the lite or panel.

Facade (face)
The whole exterior side of a building that can be seen at one view; strictly speaking, the principal front. Commonly used as reference to the exterior skin of a building.

Face Glazing
A system having a triangular bead of compound applied with a putty knife, after bedding, setting and clipping the glazing infill in place on a rabbetted sash.
Fenestration - Any glazed panel, window, door, curtain wall or skylight unit on the exterior of a building.

Fillet Bead
Caulking or sealant placed in such a manner that it forms an angle between the materials being caulked.

Fire Polish
To make glass smooth or glossy by the action of fire or intense heat.

Fire Protection Rating
The period of time that an opening protective assembly will maintain the ability to confine a fire as determined by tests – NFPA 252/ NFPA 257/UL 9/UL 10c/ASTM E 2010/ASTM E 2074.

Fire Resistance
That property of materials or their assemblies that prevents or retards the passage of excessive heat, hot gases or flames under conditions of use.

Fire Resistance Rating
The period of time a building element, component or assembly maintains the ability to confine a fire, continues to perform a given structural function, or both, as determined by tests – NFPA 251/ASTM E 119/UL 263 (wall assemblies).Flare - A protrusion on the edge of a lite of glass.

Flat Glass
A general term that describes float glass, sheet glass, plate glass and rolled glass.

Float Glass
Raw glass, float refers to the process in which the glass was made.

Flush Glazing (Pocket Glazing)
The setting of a lite of glass or panel into a four-sided sash or frame opening containing a recessed "U" shaped channel without removable stop on three sides of the sash or frame and one channel with a removable stop along the fourth side.

Frosted Finish
A surface treatment for glass, consisting of an acid etching of one or both surfaces that diffuses transmitted light and reduces glare.

Fully Tempered Glass (FT)
Glass that has been heat-treated to have either a minimum surface compression of 10,000 psi or an edge compression not less than 9,700 psi in accordance with the requirements of ASTM C 1048, kind FT or meet the requirements of ANSI Z97.1 or CPSC 16 CFR 1201 safety glazing standards. Tempered glass is 4-5 times stronger than annealed glass, and when broken, breaks into small, relatively harmless, pieces.

Flush Glazing (Pocket Glazing)
The setting of a lite of glass or panel into a four-sided sash or frame opening containing a recessed "U" shaped channel without removable stop on three sides of the sash or frame and one channel with a removable stop along the fourth side.

Frosted Finish
A surface treatment for glass, consisting of an acid etching of one or both surfaces that diffuses transmitted light and reduces glare.

Gas-Filled Units
Insulating glass units with a gas other than air in the air space to decrease the unit’s thermal conductivity (U-value) or to increase the unit’s sound insulating value.

Gaskets
Pre-formed shapes, such as strips, grommets, etc., of rubber or rubber-like composition, used to fill and seal a joint or opening either alone or in conjunction with a supplemental application of a sealant.

Girth
In bent glass, the distance around the concave or convex surface measured perpendicular to the height, including any flats.

Glass
A hard brittle substance, usually transparent, made by fusing silicates, under high temperatures, with soda, lime, etc.

Glass Clad Polycarbonate (GCP)
One or more lites of flat glass bonded with an aliphatic urethane interlayer to one or more sheets of extruded polycarbonate in a pressure/temperature/vacuum laminating process.

Glass Fines
Minute glass particles typically resulting from glass fabrication processes (i.e. cutting, grinding, polishing, drilling, edging, etc.)

Glass Quality (Flat)
Defined by ASTM C 1036 on the basis of end use and allowable blemishes. Glazing - (n) A generic term used to describe an infill material such as glass. (v) The process of installing an infill material into a prepared opening in windows, door panels, partitions, etc.

Glazing Bead
A strip surrounding the edge of the glass in a window or door, which holds the glass in place.

Glazing Channel
A three-sided, U-shaped sash detail into which a glass product is installed and retained.

Ground Edge
A special fabrication done to the edge of a piece of glass. Makes the edge smooth and gives it a whitish/gray appearance.

Gun Consistency
Sealant formulated in a degree of viscosity suitable for application through the nozzle of a caulking gun.

Heat-Absorbing Glass
Glass that absorbs an appreciable amount of solar energy.

Heat Resisting Glass
Glass able to withstand high thermal shock, generally because of a low coefficient of expansion.

Heat Soak
A process of heating glass to a specific temperature for a specified time in a special oven in an attempt to find any impurities in the glass known as "nickel sulfide inclusions".

Exercise Room
Returns house plans with a space for exercise equipment.

Facing
Covering applied to the outer surface of a building.

Family Room
Returns house plans with a casual living space, usually adjacent to the kitchen and nook where most family activities take place. Most often located to the rear of the home with access to the back yard.

Fanlight
window, often semicircular, with radiating glazing bars suggesting a fan that is placed over a door.

Fascia
horizontal piece (such as a board) covering the joint between the top of a wall and the projecting eaves; also called fascia board.

Festoon
carved or painted ornament in the form of a garland of fruit and flowers tied with ribbons and suspended at both ends in a loop; also called a swag.

Fieldstone
rough, irregularly shaped pieces of rock that can be used to cover the surface of a building, make a walkway, line a garden bed, etc.

Finial
formal ornament at the top of a canopy, gable, pinnacle, etc., usually in the general shape of a fleur-de-lis.

Fluting
shallow, concave grooves running vertically on the shaft of a column, pilaster, or other surface.

Foyer
entrance hall of a home.

French Door
tall casement window that reaches to the floor and opens like a door. A popular accent that brings more light into a house.

Friend’s Entry
returns house plans with a casual entrance usually located on the side and close to the garage entrance. Often considered a "mud room" with laundry facilities included. Can also be a small side or rear entrance for guests to use without walking around to the front door. It is most often seen on house plans with a side entry garage.

Frieze
decorated band along the upper part of an interior wall.

Gable
triangular upper portion of a wall at the end of a pitched roof. Typically has straight sides, but there are many variations.

Gallery
long room, often on an upper floor, for recreation, entertainment, or display of artwork.

Gambrel Roof
roof with one low, steep slope and an upper, less-steep one on each of its two sides, giving the look of a traditional American hay barn.

Garage Under
returns house plans with a garage that is well suited to homes that are built on sloping lots. Most plans of this type are for lots that slope up from the street, but they are also well-suited for lots that slope to one side or the other or even in the rear.

Gargoyle
figurine carved as a grotesque figure, human or animal that projects from a roof or the parapet of a wall or tower.

Gazebo
small lookout tower or summerhouse with a view, usually in a garden or park, but sometimes on the porch or roof of a house; also called a belvedere.

Geodesic Dome
building that features a lightweight, domed frame covered with wood, plywood, glass, or aluminum. An inexpensive and effective shelter that can be built quickly and can cover a large area.

Great Room
returns house plans with a large room in an average-size home that accommodates a wide variety of functions. Typically handles the functions of the living and/or family room with casual dining spaces and entertainment centers, providing visibility to the kitchen areas.

Guest / In-Law Quarters
returns house plans with a main-floor bedroom and bath, except it can be located anywhere. Often seen on main floors but also can be found in daylight basements, providing more privacy from the family quarters.

Half–Timbering
a method of construction featuring walls built of timber framework with the spaces filled in by plaster or brickwork. Often, some of the exposed planks are laid at an angle to create a pattern. In modern homes, half-timbering is usually not authentic, but used only as decoration in small areas.

Header
a brick laid in a wall so that only its end appears on the face of the wall. To add a varied appearance to brickwork, headers are alternated with stretchers, that is, bricks laid full length on their sides.

Heat Strengthened Glass
Flat or bent glass that has been heat-treated to have a surface compression between 3,500 and 7,500 psi (24 to 52 MPa) and meet the requirements of ASTM C 1048, kind HS. Heat-strengthened glass is not a safety glazing material and will not meet the requirements of ANSI Z97.1 or CPSC 16 CFR 1201.

Heat Transfer Methods
Heat transfers from one place to another via convection, conduction or radiation. Convection occurs from the upward movement of warm, light air currents. Conduction occurs when energy passes from one object to another. Radiation occurs when heat is sent through space and is capable of traveling to a distant object where it can be reflected, absorbed or transmitted.

Herringbone Work
stone, brick, or tile work in which the components are laid diagonally instead of horizontally, forming a distinctive zigzag pattern along a wall face.

Hipped Roof
roof with sloped, instead of vertical, ends.

Hobby/Recreation Room
returns house plans with a space that is more casual than a family room. Often located away for the main floor, either in a basement or upper floor, providing a great space to lay out a project or for children to play in.

Hurricane / cyclic wind-resistant glass
Laminated glazing tested to one or more test protocols for high velocity hurricane winds and windborne debris. Infrared (IR) - IR is part of the solar spectrum, or sunlight, that is invisible to the human eye. It has a wavelength range of ~790-3000 nanometers and has a penetrating heat effect. Short-wave IR converts to heat when it is absorbed by an object.

Insulating Glass (IG)
Two glass components separated by an air spacer and hermetically sealed. Inherently, insulating glass increases a window's thermal performance. Insulating Laminated Glass - An insulating glass unit in which the exterior component is a monolithic glass ply and the interior component is a laminated glass .

Interior Glazed
Glazing infills set from the interior of the building.Interior Stop - The removable molding or bead that holds the lite in place when it is on the interior side of the lite. Interlayer - Refers to the plastic or vinyl in a laminated unit. Examples are PVB, SentryGlas Plus, Saflex HP, Vanceva Storm, etc.

Iridescence
Also called strain pattern or Q-lines. It is a pattern in heat treated glass not normally visible except under certain lighting conditions. It is especially visible with the use of a polarized lens. Iridescence is an inherent characteristic of heat treated glass.

Island
returns house plans with a free-standing cabinet in the center of the kitchen that often includes an eating bar and room for bar stools. Can also include a smaller salad sink and/or cooking range.

Jambs
The vertical frame members at the perimeter of the opening.

Joint
The space or opening between two or more adjoining surfaces.

Kink
An abrupt deviation from a flat plane or the normal contours of bow and warp, and most commonly found near the edge of a piece of heat-treated glass.
Knocked Down (KD) - Fabricated framing components shipped loose for assembly at another location.

Laminated Glass -Two or more pieces of glass bonded together by a piece of plastic/vinyl called polyvinyl butyral (PVB.) A minimum interlayer thickness of .030 (.76mm) meets the requirements of ANSI Z97.1 or CPSC 16 CFR 1201 safety glazing standards.

Lattice Window
window with diamond-shaped leaded lights or glazing bars arranged like an openwork screen. Also, loosely, any hinged window, as distinguished from a sash window.

Laminated Insulating Glass
An insulating glass unit in which the exterior component is a laminated glass and the interior component is a monolithic glass ply. Laminated Plastics (Plastic Laminates) - Two or more lites (or sheets) of polycarbonate (or acrylic) with an aliphatic urethane interlayer between polycarbonate or acrylic bonded together under heat and pressure.

Library
returns house plans with a space that is normally set off from the normal noise of normal house traffic for reading or study.

Light to Solar Gain Ratio (LSG)
The ratio is equal to the Visible Light Transmittance divided by the Solar Heat Gain Coefficient. The Department of Energy's Federal Technology Alert publication of the Federal Energy Management Program (FEMP) views and LSG of 1.25 or greater to be Green Glazing/Spectrally Selective Glazing.

Lehr
A long, tunnel-shaped oven for annealing glass, usually by a continuous process.

Lite -Another term for a pane of glass. Sometimes spelled "light" in industry literature.

Live Load
Loads produced by the use and occupancy of the building or other structure and do not include construction or environmental loads such as wind load, snow load, ice load, rain load, seismic load or dead load.

Lintel
a horizontal beam or stone bridging an opening. Most often a door.

Loft/Balcony
returns house plans with any space that looks down onto another, whether inside or out. Can be a transition space in a second floor that looks down onto a great room or an exterior deck that looks over, for example, a duck pond. Loft is used to describe a second floor space that is most often seen in vacation house plans and usually is open to the floor below.

Log Construction
a form of timber construction in which walls are made of tree trunks (or logs planed down to create flat or rounded sides) that are laid horizontally on top of each another.

Loggia
a gallery open on one or more sides, sometimes pillared. Also can be a separate structure, usually in a garden.

Low-E -An abbreviation for Low Emissivity coatings. They are applied to glass to reflect invisible long-wave infrared or heat. They reduce heat gain or loss in a building by redirecting the heat. In addition, they typically provide greater light transmission, low reflection and reduce heat transfer.

Lucor -A powder used to separate lites of glass to prevent damage from scratching or rubbing.

Luminous Efficacy (Light-to-Solar Gain Ratio)
The visible transmittance of a glazing system divided by the solar heat gain coefficient (or shading coefficient). This ratio is helpful in selecting glazing products for different climates in terms of those that transmit more heat than light and those that transmit more light than heat.

Mastic
Descriptive of heavy-consistency compounds that may remain adhesive and pliable with age.

Mock-Up
A full size sample or model of a unit normally used to judge appearance and performance.

Modulus
Stress at a given strain. Also tensile strength at a given elongation.

Main Floor Bedroom & Bath
house plans with a space normally intended as a guest room but usually not as large as a typical master suite.

Main Floor Master - returns house plans for two-story homes with the master bedroom suite on the main floor. Will also return main floor master bedroom suites if you select one story.

Mansard Roof
flat on top, sloping steeply down on all four sides, thus appearing to sheath the entire top story of a house or building.

Mantelpiece
the wood, brick, stone, or marble frame surrounding a fireplace, sometimes including a mirror on the wall above.

Master Sitting area
returns house plans with a space designed for reading with a chair and side table.

Media Room
returns house plans with a space for all high-tech gadgets, big-screen TV, home theater, and video games. Space can be acoustically designed to accommodate a movie theater-like sound system.

Monolithic
Refers to a single lite of glass as a finished product.

Mullion
a vertical post or other upright that divides a window or other opening into two or more panes, sometimes only ornamental.

Niche
a recess in a wall (interior or exterior), especially for a statue. Usually curved at the back.

Nickel Sulfide
an inclusion in float glass that can cause spontaneous breakage in fully tempered glass. Offset - Either a laminated or insulating unit wherein the two edges don't match up.

Nook/Breakfast
returns house plans with a space adjacent to the kitchen for casual dining and identified only when it is in addition to a formal dining room.

Nursery
returns house plans with a bedroom for babies and small children, usually adjacent to and accessible from the master bedroom.

OITC Rating
An abbreviation for Outside-Inside Transmission Class Rating. This rating is used to classify the performance of glazing in exterior applications. It is based on ASTM E-1332 Standard Classification for the Determination of Outdoor-Indoor Transmission Class. While STC rating is based on a "White' noise spectrum, this standard utilizes a source noise spectrum that combines Aircraft/Rail/Truck traffic and is weighted more to lower frequencies.

Opacifier Film
An adhesive film applied to glass for spandrel applications. Organic - Any compound which consists of carbon and hydrogen with a restricted number of other elements, such as oxygen, nitrogen, sulphur, phosphorous, chlorine, etc.

Open Floor Plan
returns house plans with open floor plans that accommodate the flow of today's casual lifestyles. Combines smaller single-purpose spaces to make large multifunction gathering areas, so, for example, the cooks aren't isolated in the kitchen while the rest of the family is in the next room socializing and playing games. Ideal for creating spacious, sunny rooms.

Oversized Garage
returns house plans with any garage space for parking, storage, or a workshop that can accommodate three or more cars.

Palladian Window
a window with three openings: the central one arched and wider than the other two.

Parapet
a low wall placed to protect any spot where there's a sudden drop, such as at the edge of a bridge or housetop.

Parquet Flooring
flooring of thin hardwood laid in patterns on a wood sub floor. Inlaid parquet is decorative hardwood veneer glued in patterns to squares of softwood backing, then laid on a sub floor.

Patio
paved recreation area, usually at the rear of a home.

Patterned Glass
One type of rolled glass having a pattern impressed on one or both sides. Used extensively for light control, bath enclosures and decorative glazing. Sometimes called "rolled," "figured" or "obscure" glass.

Permanent Set
The amount by which a material fails to return to its original dimensions after being deformed by an applied force or load.

Pocket (Channel)
A three-sided, U-shaped opening in a sash or frame to receive glazing infill. Contrasted to a rabbet, which is a two-sided, L-shaped section, as with face glazed window sash. Pocket (Channel) Depth - The inside dimension from the bottom of the pocket to the top. Pocket depth equals the bite plus the edge clearance.

Pocket (Channel) Width
The measurement between stationary stops (or stationary stop and removable stop) in a U-shaped channel points - Thin, flat, triangular or diamond shaped pieces of zinc used to hold glass in wood sash by driving them into the wood.

Polariscope
A device for examining the degree of strain in a sample of glass. Polished Edge - A special fabrication done to the edge of a piece of glass. Makes the edge smooth and gives it an extremely shiny or polished appearance. Polished Wired Glass - Wired glass that has been ground and polished on both surfaces

Pedestal
in classical architecture, the base supporting a column or colonnade.

Pediment
in classical architecture, a low-pitched gable above a portico. Also a similar feature above doors in homes. May be straight or curved, "broken" in the center, or solid.

Peninsula/Eating Bar
returns house plans with a feature similar to an island, but a peninsula is normally attached to the main kitchen cabinets and, like its metaphor, open on three sides instead of four. A peninsula usually includes an overhanging eating bar that allows room for bar stools, but it is common for it to not have this feature. The sink or cooking range can also be located here.

Penthouse
a separately roofed structure on the top of a tall block of apartments or condominiums. Also, the top-floor unit in a residential high-rise.

Pergola
a covered walk in a garden, usually formed by a double row of posts or pillars with joists above and covered by climbing plants.

Pilaster
a shallow pier or a rectangular column projecting only slightly from a wall that is primarily decorative.

Polycarbonate
Extruded plastic sheet that can be glazed singly or as a component of a laminated glazing product.

Polyisobutylene (PIB)
The primary seal of an insulating unit and the key component in restricting moisture vapor transmission. Polymer - A chemical structure consisting of long chains of molecular units.

Polysulfide Sealant
Polysulfide liquid polymer sealant, which are mercaptan terminated, long chain aliphatic polymers containing disulfide linkages. They can be converted to rubbers at room temperature without shrinkage upon addition of a curing agent.

Polyurethane
Also commonly called urethane. Used by some insulating fabricators for a secondary sealant. It is also an interlayer used in polycarbonate security products. Polyurethane Sealant - An organic compound formed by the reaction of a glycol with an isocyanate.

Polyvinyl Butyral (PVB)
The plastic or vinyl used in the makeup of a laminated unit, the vinyl is what holds that unit together.

Polyvinyl Chloride (PVC)
Polymer formed by polymerization of vinyl chloride monomer. Sometimes called vinyl.

Pot Life
The time interval following the addition of an accelerator before a chemically curing material will become too viscous to apply satisfactorily.

Positive Air
The opposite of negative air. In an insulating unit, where the center of the unit is farther apart than around the air spacer, these units have a bowed out appearance.

Pre-Shimmed Tape Sealant
A sealant having a pre-formed shape containing solids or discrete particles that limit its deformation under compression.

Primer
A coating specifically designed to enhance the adhesion of sealant systems to certain surfaces, to form a barrier to prevent migration of components, or to seal a porous substrate.

Priming
Sealing of a porous surface so that compound will not stain, lose elasticity, shrink excessively, etc., because of loss of oil or vehicle into the surround. A sealant primer or surface conditioner may be used to promote adhesion of a curing type sealant to certain surfaces.

Pyrolytic Deposition
A process of applying a thin metallic coating to the surface of flat glass during the float glass manufacturing process.

R-Value
Thermal resistance is expressed in ft^2/hr/°F/BTU. It is the reciprocal of U-value. The higher the R-value, the less heat is transmitted through the glazing material.

Rabbet
An "L" shaped section, which can be face glazed or receive a removable glazing bead to hold the lite of glass in place.

Racking
A movement or distortion of sash or frames causing a change in angularity of corners.

RAT Equation
The RAT equation accounts for 100 percent of solar energy, which is equal to the sum of solar reflectance, absorption and transmittance. For example, with a single pane of 1/8" (3mm) clear glass, 83 percent of solar energy is transmitted, 8 percent is reflected and 9 percent is absorbed by the glass. Of the solar energy absorbed, portions are emitted back towards the exterior and towards the building interior.

Porch
the roofed entrance to a house.

Portico
a roofed entrance to a house with columns, creating a temple-like facade.

Porte-Cochere
a roofed structure extending from the side or front entrance of a home over an adjacent driveway to shelter those entering or exiting a vehicle.

Pre-cast Concrete
concrete components cast in a factory or on-site before they're used in construction.

Pre-fabrication
the manufacture of entire buildings or their components cast in a factory or on-site before they're used in construction.

Pre-stressed Concrete
evolved from reinforced concrete by replacing the reinforcing steel with wire cables in ducts.

Quoins
dressed stones at the corners of buildings, usually laid so their faces are alternately large and small. Most often in a contrasting color of brick from the rest of the wall. Common accent in Georgian homes.

Rear Entry Garage
returns house plans with a garage that has doors that are not visible from the front. This type of garage is well-suited to corner lots or lots with alley access.

Rear Garage
returns house plans with a garage that is located to the rear of the home regardless of the door location.

Reflective Glass
Glass with a metallic coating to reduce solar heat gain.

Relative Heat Gain
The amount of heat gain through a glass product taking into consideration the effects of solar heat gain (shading coefficient) and conductive heat gain (U-value). The value is expressed in Btu/hr/ft2 (W/m2). The relative heat gain is calculated as RHG = (Summer U-value x 14oF) + (Shading Coefficient x 200). The lower the relative heat gain, the more the glass product restricts heat gain.

Removable Double Glazing (RDG)
A removable glazed panel or sash on the inside or outside of an existing sash or window, such as a storm panel, used for additional insulation and protection against the elements. Roll (or Roller)

Roll Impressions
Indentations in the surface of rolled glass that are caused by contact of the glass with the rolls and/or displaced roll disks while the glass surface is in a plastic state.

Roll Marks (also Roll Scratches)
A series of the fine parallel scratches or tears on the surface of rolled glass in the direction of draw. They are 1/8" (3 mm) long or smaller, but usually so fine and so close together that they appear to be a series of incipient checks rather than scratches. They are caused by a difference in velocity between rolls and the sheet of glass.

Rolled Glass
Glass formed by rolling, including patterned and wired glass.

Reinforced Concrete
the result of inserting steel rods in concrete beams to help them withstand longitudinal stress without collapsing. Enables the construction of very large structures using concrete beams.

Roller Wave
The appearance of waviness sometimes seen in heat treated glass caused by the glass moving over rollers in the tempering furnace. Rough Opening - The opening in a wall into which a door or window is to be installed.

Rub
A series of small scratches in glass generally caused during transport by a chip lodged between two lites.

R-Value
The thermal resistance of a glazing system expressed ft2/hr/oF/Btu (m2/W/oC). The R-value is the reciprocal of the U-value. The higher the R-value, the less heat is transmitted throughout the glazing material.

Rustication
masonry cut in massive blocks separated by deep joints. Used to give a rich, bold texture to an outside wall. Common in Romanesque homes. Effect sometimes simulated in stucco and other building materials.

Sandblasted Finish
A surface treatment for flat glass obtained by spraying the glass with hard particles to roughen the surface. The method restricts vision while maintaining a level of light transmission. Sash - The window frame, including muntin bars if used, to receive the glazing infill.

Score
To penetrate the surface of a lite of glass by means of a cutting device, e.g. a glass cutter, along a predetermined line in order to produce a lite of glass of a specific size and/or shape.

Scratches
Any marking or tearing of the surface appearing as though it had been done by either a sharp or rough instrument.

Screw-On Bead (or Applied Stop)
Stop, molding or bead fastened by screws as compared with those that snap into position without additional fastening.

Sealant
An elastomeric material with adhesive qualities, applied between components of a similar or dissimilar nature to provide an effective barrier against the passage of the elements.

Seam (verb)
To grind, usually with an abrasive belt, wet or dry, the sharp edges of a piece of glass.

Seeds
Minute bubbles in float glass less than 1/32" (.8 mm) in diameter.

SentryGlas® Plus (SGP)
A laminate that incorporates an ionoplast interlayer which is bonded directly between two layers of glass. The product was originally marketed for hurricane protection but is also used for blast mitigating applications.

Setting
Placement of lites or panels in sash or frames. Also action of a compound as it becomes more firm after application.

Sash Window
a window formed with sashes or sliding frames running in vertical grooves.

Setting Blocks
Small pieces of neoprene or other material which are placed under the lower edge of a lite of glass to support it within a frame.
Screened Porch/sunroom - returns house plans with any space that either allows ample sunshine or protection from pests such as mosquitoes. Because most often it is not a heated or cooled space, it is not included in the total square footage.

Shading Coefficient
Shading coefficient is the ratio of solar heat gain through a specific type of glass that is relative to the solar heat gain through a 1/8" (3mm) ply of clear glass under identical conditions. As the shading coefficient number decreases, heat gain is reduced, which means a better performing product. Shadowgraph - A device for inspecting glass with respect to distortion and other defects.

Shelf Life
Used in the glazing and sealant business to refer to the length of time a product may be stored before beginning to lose its effectiveness. Manufacturers usually state the shelf life and the necessary storage conditions on the package.

Shore "A" Hardness
Measure of firmness of a compound by means of a Durometer Hardness Gauge (Shore A hardness range of 20-25 is about the firmness of an art gum eraser. A hardness of 90 is about the firmness of a rubber heel).

Sight Line
The line along perimeter of glazing infills corresponding to the top edge of stationary and removable stops. The line to which sealants contacting the glazing infill are sometimes finished off.

Silicone Sealant
A sealant having as its chemical composition a backbone consisting of alternating silicon-oxygen atoms.

Silkscreen
A process of applying a specific design or pattern to glass. The design is made by placing a screen over a piece of glass and then pressing ceramic frit, by means of a large squeegee, through the pores of the screen. After the frit is applied, the glass goes through an infra-red oven to dry the frit and then through a tempering furnace to fire (bond) the frit to the glass permanently.

Shutters
window or door screens featuring horizontal slats that may be articulated, allowing control over air and light transmission. Usually made of wood. While they may be hinged, modern exterior shutters are often decorative and remain fixed to the wall alongside the window or door opening.

Side Entry Garage
returns house plans with a garage whose doors are not located in front of the house. Can be located facing the side of the property, making them well-suited for a corner lot or one that is wide enough to allow a car to back up. Doors can also be located on the side facing inward so that cars pass the front entry to enter the garage.

Sill
the lower horizontal part of a window frame. Materials vary widely from wood to marble.

Skylight
a window set into a roof and ceiling to provide extra lighting. Sizes, shapes, and placement vary widely. A window glazed in a roof or ceiling of a building.

Sloped Glazing
Glass units that are glazed more than 15° off vertical.

Soffit
the underside of any architectural element (for example, a building overhang or staircase). In modern homes, the wood or metal screening used to cover such areas.

Solarium
a glass-enclosed porch or room, often used to display flowers and other plants; also called a sunroom or garden room.

Solar Control Glass
Tinted and/or coated glass that reduces the amount of solar heat gain transmitted through a glazing product.

Smoke
Streaked areas appearing as slight discoloration on glass.

Solar Control Glass
Tinted and/or coated glass that reduces the amount of solar heat gain transmitted through a glazed product.

Solar Energy
The sum total of the solar spectrum. Solar Energy Reflectance - In the solar spectrum, the percentage of solar energy that is reflected from the glass surface(s).

Solar Energy Transmittance
The percentage of ultraviolet, visible and near infrared energy within the solar spectrum (300 to 2100 nanometers) that is transmitted through the glass. Solar Heat Gain Coefficient (SHGC) - The portion of directly transmitted and absorbed solar energy that enters into the building's interior. The higher the SHGC, the higher the heat gain.

Solar Reflectance
The percentage of solar energy that is reflected from the glass surface(s)

Solar Reflective Coatings
Coatings that reduce heat gain through higher solar reflection.

Solar Spectrum
The solar spectrum, commonly referred to as sunlight, consists of ultraviolet light, (UV), visible light and infrared (IR). The energy distribution within the solar spectrum is approximately 2 percent UV, 47 percent visible light and 51 percent IR. One aspect of the solar spectrum is its wavelength in which nanometer (nm) is the unit of length [1 nm+10^-9 m].

Solar Transmittance
The percentage of ultraviolet, visible and near infrared energy (300 - 3000 nanometers) that is transmitted through the glass.

Solarization
Change in transmission, and sometimes color, of plastics as a result of exposure to sunlight or other radiation.

Spacers (Shims)
Small blocks of neoprene, EPDM, silicone or other suitable material, placed on each side of the glass product to provide glass centering, maintain uniform width of sealant bead and prevent excessive sealant distortion.

Spandrel
The panel(s) of a wall located between vision areas of windows, which conceal structural columns floors and shear walls. Glass panels incorporate either a ceramic frit, opacifier film, or are installed into a shadow box application. Spectrally

Selective Glass
Tinted and/or coated flat glass that reduces the amount of solar heat gain transmitted through a glazed product. STC (Sound Transmission Class) - A single number rating derived from individual transmission losses at specified test frequencies (for more information see ASTM E 90 and ASTM E 413). It is used for interior walls, ceilings and floors and in the past was also used for preliminary comparison of the performance of various glazing materials.

STL (Sound Transmission Loss)
The reduction of the amount of sound energy passing through a wall, floor, roof, etc. It is related to the specific frequency (Hz) at which it is measured and it is expressed in decibels (dB). Also called "Transmission Loss (TL)." STC Rating - Abbreviation for Sound Transmission Class Rating. When glass is used on the building interior, the sound transmission classification (STC) value can be used to categorize the glass performance. The STC rating is a single-number rating system for interior building partitions and viewing windows. The STC rating is derived by testing in accordance with ASTM E90, 'Laboratory Measurement of Airborne sound Transmission of Building Partitions". The STC value is achieved by applying the Transmission loss (TL) values to the STC reference contour of ASTM E413, "Determination of Sound Transmission Class". The STC rating is a basis for glass selection. Its original intent was to quantify interiro building partitions, not exterior wall components. As a result, it is not recommended for glass selection of exterior wall applications, since the single-number rating was achieved under a specific set of laboratory conditions. Stones - Any crystalline inclusion imbedded in the glass.

Stop
Either the stationary lip or the removable molding of the rabbet, serving to hold the glazing infill in the sash or frame, with the help of spacers.

Storm Door
A panel or sash door placed on the outside of an existing door to provide additional protection from the elements.

Storm Window
A glazed panel or sash placed on the inside or outside of an existing sash or window as additional protection against the elements.

Stain
Discoloration of either a glass or finished aluminum surface caused by alkalis that leach from surrounding materials such as pre-cast or cast-in-place concrete or from sealants, pollutants or other contaminants.

Split Bedrooms
returns house plans where the master bedroom is on one end of the house and the secondary bedrooms are on the other. Typically, the next stop after the nursery.

Stanchion
a vertical supporting beam that is mainly steel.

Storage
returns house plans with extra space ideal for seasonal storage: Christmas decorations, snow skis, sports equipment, and anything else you don't use everyday but want immediate access to if you need it.

Strain
The percentage of elongation or compression of a material or portion of a material caused by an applied force.

Strain Pattern
A specific geometric pattern of iridescence or darkish shadows that may appear under certain lighting conditions, particularly in the presence of polarized light (also called quench marks). The phenomenon is caused by the localized stresses imparted by the rapid air cooling of the tempering operation. Strain pattern is characteristic of heat-treated glass.

Stress (Residual)
Any condition of tension or compression existing within the glass, particularly due to incomplete annealing, temperature gradient, or inhomogeneity.

Striking Off
The operation of smoothing off excess compound or sealant at sight line when applying same around lites or panels.

Structural Glazing Gaskets
Cured elastomeric channel-shaped extrusions used in place of a conventional sash to install glass products onto structurally supporting sub-frames, with the pressure of sealing exerted by the insertion of separate lockstrip wedging splines.

Structural Silicone Glazing
The use of a silicone sealant for the structural transfer of loads from the glass to its perimeter support system and retention of the glass in the opening.

Strut
a roof timber, either upright and connected to the rafter above it, or sloping, connecting another post to the rafter.

Stucco
a sturdy type of plaster used on exterior walls. Often spread in a decorative pattern.

Studs
smaller upright beams in a house, to which drywall panels, or laths for plaster, are attached.

Substrate
The raw glass or base material to which other materials or fabrication procedures are applied.

Suited for a Narrow Low
returns house plans that are no wider than 50 feet.

Suited for a sloping lot
house plans that fit well into a sloping lot. Returned plans range from a full slope to the rear of the house creating a daylight basement to a simple side-to-side slope that can accommodate a garage tucked under a portion of the house.

Suited for a vacation Home
returns house plans for homes that shouldn't be excluded from the mainstream residential market, but would also make a great vacation getaway home.

Suited for a view Lot
returns house plans that have living spaces positioned in such a way to take advantage of a view. This can be from any direction, not just out the back. Many beautiful view properties have their views out the front.

Tandem Garage
returns house plans with a garage most often used with homes that are to be built on narrow lots but where an oversized garage is still desired. Provides a similar amount of square footage as a three-or-more car garage, but the entrance is only two doors. The disadvantage is having to park cars behind one another.

Tape Sealant
A sealant having a pre-formed shape, and intended to be used in a joint under compression.

Thermal Endurance
The relative ability of glass to withstand thermal shock. Tin Side - The bottom side of float glass as it was manufactured. Called "tin side" because float glass rides on a bath of liquid tin while it is being cooled.

Tinted Glass
Glass with colorants added to the basic glass batch that give the glass color, as well as, light and heat-reducing capabilities. The color extends throughout the thickness of the glass. Typical colors include bronze, gray, dark gray, aquamarine, green, deep green, blue and black.

Toe Bead
Sealant applied at the intersection of the outboard glazing stop and the bottom of the glazing channel; must be sized to also provide a seal to the edge of the glass.

Tong Marks
Small, surface indentations near and parallel to one edge of vertically-tempered or vertically heat-strengthened glass resulting from the tongs used to suspend the glass during the heat treating process.

Tooling
The operation of pressing in and striking a sealant in a joint, to press the sealant against the sides of a joint and secure good adhesion; the finishing off of the surface of a sealant in a joint so that it is flush with the surface.

Toughened Glass
International terminology for fully tempered glass. (See Fully Tempered Glass)Transmittance - The ability of the glass to pass light and/or heat, usually expressed in percentages (visible transmittance, thermal transmittance, etc.).Two-Part (Multi-Component)

Sealant
A product comprised of a base and curing agent or accelerator, necessarily packaged in two separate containers, which are uniformly mixed just prior to use.

U-Value
A measure of heat gain or heat loss through glass due to the differences between indoor and outdoor temperatures. These are center pane values based on NFRC standard winter nighttime and summer daytime conditions. U-values are given in BTU/hr/ft^2/°F for the English system. Metric U-values are given in W/m^2/°C. NFRC winter nighttime U-values are based on an outdoor temperature of 0°F (-17.8°C), an indoor temperature of 70°F (21°C) and a 12.3 mph (19.8 km/h) outdoor air velocity. NFRC summer daytime U-values are based on an outdoor temperature of 89°F (32°C), an indoor temperature of 75°F (24°C), a 6.2 mph (10.1 km/h) outdoor air velocity and a solar intensity of 248 BTU/hr/ft^2/°F (782 W/m^2).

Teen Suite
returns house plans with a bathroom that serves two secondary bedrooms. Can be accessible from hallway but not necessarily. Also refers to a secondary bedroom that has its own private bath.

Terrace
a level promenade in front of a building. Usually made of stone and accented with plants, statuary, etc.

Terra-cotta
fired but unglazed clay, used mainly for floor and roof tiles. Can be fired in molds to produce a wide range of shapes. Usually red.

Terrazzo
a sturdy flooring finish of marble chips mixed with cement mortar. After drying, the surface is ground and polished.

Thatch
a roof covering of straw, reeds, or even living grass. In modern homes, most thatching is only decorative, simulated with shingles.

Thermal Windows
windows designed with multiple panes to trap air and provide greater insulation.

Tie Beam
the main horizontal beam in a roof, connecting the bases of the rafters, usually just above a wall.

Transom
usually rectangular or fanlight window over a door. Some transoms open to cross-ventilate a home, while others are only decorative.

Trim
the framing or edging of openings and other features on the facade of a building or indoors. Trim is usually a different color or material than the adjacent wall.

Truss
a number of wood planks framed together to bridge a space, such as a roof truss.

Turret
a very small, slender tower. In modern homes, usually only ornamental.

Unfinished Basement
returns house plans with a full "dark" basement that is built under a home on a flat lot. Building codes require that this type of basement have at least one window for escape that is the same size as a typical bedroom window.

Unit
Term normally used to refer to one single assembly of insulating glass.

Universal Design
returns house plans with provisions for people with mobility problems. Including, but not limited to, grab bars, wider doors and hallways, wheel chair maneuvering space, etc.

United Inches
Total of one width and one height of a lite of glass in inches.

Vacuum (Sputtering) Deposition - Process for applying multiple layers of metallic coatings to the surface of flat glass in a vacuum chamber.

Unfinished/Future Space
returns house plans with any space, regardless of its location, that can be finished at a later date. Often refers to a bonus room or an unfinished daylight basement.

Ultraviolet Light (UV)
The name of the invisible portion of the light spectrum with wavelengths shorter than 390 nanometers. The damaging effects on long-term UV exposure results in fabric fading and plastic deterioration.

Upstairs Laundry
returns house plans with a laundry space upstairs.

Upstairs Master
returns house plans for two-story homes with the master bedroom suite on the upstairs floor.

Vinyl Glazing
Holding glass in place with extruded vinyl channel or roll-in type.

Visible Light Reflectance
The percentage of visible light (390 to 770 nanometers) within the solar spectrum that is reflected from the glass surface.

Visible Light Transmittance
The percentage of visible light (380 - 780 nanometers) that is transmitted through the glass. (Visible light is the only portion of the solar spectrum visible to the human eye.)

Wave
An optical effect in flat glass due to irregularities in the surface of the glass that make objects viewed at various angles appear wavy or bent. Weathering (also Stain) - Attack of a glass surface by atmospheric elements. Weather-stripping - A material or device used to seal the opening between sash and/or sash and frame.

Weeps (or Weep Holes)
Drain holes or slots in the sash or framing member to prevent accumulation of condensation and water.

Wet Seal
Application of an elastomeric sealant between the glass and sash to form a weather-tight seal. Window - An opening constructed in a wall or roof and functioning to admit light or air to an enclosure, usually framed and spanned with glass mounted to permit opening and closing.

Wired Glass
Rolled glass having a layer of meshed or stranded wire completely imbedded as nearly as possible to the center of thickness of the lite. This glass is available as polished glass (one or both surfaces) and patterned glass. Approved polished wired glass is used as transparent or translucent fire protection rated glazing. Patterned wired glass is sometimes used as decorative glass. It breaks more easily than unwired glass of the same thickness, but the wire restrains the fragments from falling out of the frame when broken.

Work Life
The time during which a curing sealant (usually two compounds) remains suitable for use after being mixed with a catalyst.

Volume / Vaulted Ceilings
returns house plans with any ceilings that are over 9 feet or sloping. Can range from being just enough higher to create a greater sense of spaciousness to defining a space from which you can look down onto a room from an upper floor.

Wainscoting
decorative paneling covering the lower three to four feet of an interior wall. Usually wood in a plain design. May be painted or only varnished.

Walk-in Closet
returns house plans with a bedroom closet that you can walk into.

Walk-in Pantry
returns house plans with a generous storage area either in, or adjacent to, the kitchen. Unlike a cabinet attached to the others in the kitchen, a walk-in pantry can also include a baking area and provide an abundance of storage space.

Weeping Mortar
this decorative mortar appears to be dripping out between the exterior bricks.

Widow’s Walk
a small, railed observation platform built out from the roof. Once used to scout for returning ships, such walks are usually square, done in elaborately-worked wrought iron or wood.

Wine Cellar
returns house plans with a special place for your wine collection. Today's wine cellars are often greatly embellished spaces that can even be climate controlled for the serious connoisseur.

Workshop
returns house plans with a space usually adjacent to the garage but can also be located in an unfinished basement. Well suited for crafts and hobbies.

Wrap-around Porch
returns house plans with porches that conform to the outside shape of the house, from the front to the side or sides, although it may not extend to the back to join a rear porch.

Zebra Board
A board with alternating black and white diagonal lines used to observe optical transmission and reflection qualities in coated and uncoated glass.