D definitions - Building Terms Dictionary



D definitions - Do you know architectual drafting or building terms starting with the letter "D"?

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Damper:
A flap to control or obstruct the flow of gases,specifically, a metal control flap in the throat of a fireplace or in a air duct.

Dampproofing:
A coaing applied to the outside face of a basement wal as a barrier to the passage of water.

Dap:
A notch at the end of a piece of material.

Darby:
A stiff straightedge of wood or metal used to level the surface of wet plaster.

Daylighting:
Illuminating the interior of a building by natural means.

Dead Load:
The weight of the building or building component itself.

Deadman:
A large and/or heavy object buried in the ground as an anchor.

Decking:
A material used to span acrosss beams or joints to create a floor or roof surface.
Deformation:
A change in the shape of a structure or structural element caused by a load or forceacting on the structure.

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Depressed Strand:
Apretensioning tendon that is pulled to the bottom of the beam at the centre of the span to follow more closely the path of tensile forces in the member.

Derrick:
Any of the member of devices for hoisting building materials on the end of a rope or cable.

Dew Point:
The temperature at which water will begin to condense from a mass of air of a given temperature and moisture content.

Diamond Saw:
A tool with a moving chain,belt,wire,straight blade, or circular blade whose cutting action is carried out by diamonds.

Diaphragm Action:
A bracing action that derives from the stiffness of a thin pane of material when it is loaded in a direction parallel to the plane. Diaphgrms in buildings are typically floor,wall, or roof surfaces of wood panels,reinforced masonry, steel decking, or reinforced concrete.

Die:
An industrial tool for giving identical form of repeatedly produced or continously generated units, such as a shaped orifice for giving form to a column of clay,a steel wire,or an aluminum extrusion,a shaped punch for making cutouts ofsheet metal or paper, a mold for casting plastic or metal,a cutting tool that produces screw threads.

Die- Cut:
Manufactured by punching from a sheet material.

Differential Settlement:
Subsidence of various foundation elements of a building at differing rates.

Diffuser:
A louver shaped so as to distribute air about a room.

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Dimension Lumber:
Lengths of wood,rectangular in cross section, sawed directly from the log.

Dimension Stone:
Building stone cut to a Rectangular shape.

Distribution Rib:
A transverse beam at the minspan of a one-way concrete joist structure used to allow the joists to share concentrated loads.

Divider Strip:
A strip of material or plastic embedded in terrazzo to form control joints and decorative patterns.

Dome:
An arch rotated about its vertical axis to produce a structure shaped like an inverted bowl;a form used to make one of the cavities in a concrete waffle slab.

Dormer:
A structure protuding through the plane of a sloping roof,usually containing a window and having its own smaller roof.

Double glazing:
Two parallel sheets of glass with an airspace between.

Double-hung window:
A window with two overlapping sashes that slide vertically in tracks.

Double shear:
Acting to resist shear forces at two locations, suck as a bolt that passes through a steel supporting angle,a beam web, and another supporting angle.

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Double-strength glass:
Glass that is approximately 1/8 inch(3mm) in thickness.

Double tee;
A precast concrete slab element that resembles the letters TT in cross section.

Dovetail slot anchor:
A system for fstening to concrete structure that uses metal tabs inserted into a slot that is small at the face of the concrete and larger behind.

Dowel:
A short cylinderical rod of wood or steel,a steel reinforcing bar that projects from a foundation to tie it to a column or wall, or from one section of a concrete slab or wall to another.

Downspout:
A vertical pipe for conducting water from a roof to a lower level.

Drainage:
Removal of water.
D definitions Top

Draped tendon:
A posttensioning strand that is placed along a curving profile that approximates the path of the tensile forces in a beam.

Drawing:
Shaping a material by pulling it through an orifice, as in the drawing of steel wire or the f=drawing of a sheet of glass.

Drawn glass:
Glass sheet pulled directly from a container of molten glass.

Drift:
Lateral deflection of a building caused by wind and earthquake loads.

Drift pin:
A tapered steel rod used to algin bolt holes in steel connections during erection.

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