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Lag-Screws or Coach-Screws
Large, heavy screws, used where great strength is required, as in heavy framing or when
attaching ironwork to wood.
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Lally Column
A steel tube sometimes filled with concrete, used to support girders or other floor beams.
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Lath
One of a number of thin narrow strips of wood nailed to rafters, ceiling joists, wall studs,
etc. to make a groundwork or key for slates, tiles, or plastering.
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Leaching Bed
Tiles in the trenches carrying treated wastes from septic tanks.
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Ledger
A piece of wood which is attached to a beam to support joists.
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Lintel
The top piece over a door or window which supports walls above the opening.
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Load-Bearing Wall
A strong wall capable of supporting weight.
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Louver
An opening with horizontal slats to permit passage of air, but excluding rain, sunlight and
view.
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Masonry
Walls built by a mason, using brick, stone, tile or similar materials.
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Molding
A strip of decorative material having a plane or curved narrow surface prepared for
ornamental application. These strips are often used to hide gaps at wall junctures.
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Moisture Barrier
Treated paper or metal that retards or bars water vapor, used to keep moisture from passing
into walls or floors.
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Mullion
Slender framing which divides the lights or panes of windows.
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Newel
The upright post or the upright formed by the inner or smaller ends of steps about which
steps of a circular staircase wind. In a straight flight staircase, the principal post at the foot or the secondary post at a
landing.
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Nosing
The rounded edge of a stair tread.
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Parging
A rough coat of mortar applied over a masonry wall as protection or finish; may also serve
as a base for an asphaltic waterproofing compound below grade.
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Pilaster
A projection or the foundation wall used to support a floor girder or stiffen the wall.
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Pitch
The angle of slope of a roof.
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Plasterboard (See Dry Wall)
Gypsum board, used instead of plaster.
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Plates
Pieces of wood placed on wall surfaces as fastening devices. The bottom member of the wall
is the sole plate and the top member is the rafter plate.
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Plenum
A chamber which can serve as a distribution area for heating or cooling systems, generally
between a false ceiling and the actual ceiling.
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Pointing
Treatment of joints in masonry by filling with mortar to improve appearance or protect
against weather.
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Post-And- Beam Construction
Wall construction in which beams are supported by heavy posts rather than many smaller
studs.
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Prefabrication
Construction of components such as walls, trusses, or doors, before delivery to the building
site.
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Rabbet
A groove cut in a board to receive another board.
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Radiant Heat
Coils of electricity, hot water or steam pipes embedded in floors, ceilings, or walls to
heat rooms.
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Rafter
One of a series of structural roof members spanning from an exterior wall to a center ridge
beam or ridge board.
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Reinforced Concrete
Concrete strengthened with wire or metal bars.
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Ridge Pole
A thick longitudinal plank to which the ridge rafters of a roof are attached.
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Riser
The upright piece of a stair step, from tread to tread.
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Roof Sheathing
Sheets, usually of plywood, which are nailed to the top edges of trusses or rafters to tie
the roof together and support the roofing material.
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Sandwich Panel
A panel with plastic, paper, or other material enclosed between two layers of a different
material.
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Sash
The movable part of a window-the frame in which panes of glass are set in a window or door.
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Scotia
A concave molding.
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Scuttle Hole
A small opening either to the attic, to the crawl space or to the plumbing pipes.
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Seepage Pit
A sewage disposal system composed of a septic tank and a connected cesspool.
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Septic Tank
A sewage settling tank in which part of the sewage is converted into gas and sludge before
the remaining waste is discharged by gravity into a leaching bed underground.
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Shakes
Handcut wood shingles.
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Sheathing (See Wall Sheathing)
The first covering of boards or material on the outside wall or roof prior to installing the
finished siding or roof covering.
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Shim
Thin tapered piece of wood used for leveling or tightening a stair or other building
element.
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Shingles
Pieces of wood, asbestos or other material used as an overlapping outer covering on walls or
roofs.
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Shiplap
Boards with rabbeted edges overlapping.
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Shiplap
Siding Boards of special design nailed horizontally to vertical studs with or without
intervening sheathing to form the exposed surface of outside walls of frame buildings.
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Sill Plate
The lowest member of the house framing resting on top of the foundation wall. Also called
the mud sill.
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Skirtings
Narrow boards around the margin of a floor; baseboards.
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Slab
Concrete floor placed directly on earth or a gravel base and usually about four inches
thick.
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Sleeper
Strip of wood laid over concrete floor to which the finished wood floor is nailed or glued.
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Soffit
The visible underwide of structural members such as staircases, cornices, beams, a roof
overhang or eave.
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Softwood
Easily worked wood or wood from a conebearing tree.
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Soil Stack
Vertical plumbing pipe for waste water.
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Stringer
A long, horizontal member which connects uprights in a frame or supports a floor or the
like. One of the enclosed sides of a stair supporting the treads and risers.
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Studs
In wall framing, the vertical members to which horizontal pieces are nailed. Studs are
spaced either 16 inches or 24 inches apart.
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Subfloor
Usually, plywood sheets that are nailed directly to the floor joists and that receive the
finish flooring.
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Sump
A pit in the basement in which water collects to be pumped out with a sump pump.
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Swale
A wide shallow depression in the ground to form a channel for storm water drainage.
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Tie
A wood member which binds a pair of principal rafters at the bottom.
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Tile Field
Open-joint drain tiles laid to distribute septic tank effluent over an absorption area or to
provide subsoil drainage in wet areas.
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Toenail
Driving nails at an angle into corners or other joints.
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Tongue-And- Groove
Carpentry joint in which the jutting edge of one board fits into the grooved end of a
similar board.
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Trap
A bend in a water pipe to hold water so gases will not escape from the plumbing system into
the house.
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Tread
The horizontal part of a stair step.
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Truss
A combination of structural members usually arranged in triangular units to form a rigid
framework for spanning between load-bearing walls.
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Valley
The depression at the meeting point of two roof slopes.
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Vapor Barrier
Material such as paper, metal or paint which is used to prevent vapor from passing from
rooms into the outside walls.
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Venetian Window
A window with one large fixed central pane and smaller panes at each side.
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Vent Pipe
A pipe which allows gas to escape from plumbing systems.
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Verge
The edge of tiles, slates or shingles, projecting over the gable of a roof.
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Wainscoting
The lower three or four feet of an interior wall when lined with paneling, tile or other
material different from the rest of the wall.
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Wall Sheathing
Sheets of plywood, gypsum board, or other material nailed to the outside face of studs as a
base for exterior siding.
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Weather Stripping
Metal, wood, plastic or other material installed around door and window openings to prevent
air infiltration.
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Weep Hole
A small hole in a wall which permits water to drain off.
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