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Dewatering

Pumping subsurface water from an excavation to maintain dry and stable working conditions.

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Direct Current (DC)

Electricity that flows in one direction.

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Discount rate

A mortgage interest rate that is lower than the current rate for a certain period of time, e.g. 2.00% below variable rate for 2 years.

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Dioxin

According to the World Health Organization, dioxins are some of the most potent toxins known to humans, with no known safe limit for exposure and a strong propensity for bioaccumulation. In addition, dioxins are highly persistent in the environment. https://healthymaterialslab.org/tool-guides/hml-resources

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Disclosure

The reporting by manufacturers about product ingredients, impacts, or other attributes to the public or to third parties. https://healthymaterialslab.org/tool-guides/hml-resources

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Disconnect

A large (generally 20 Amp) electrical ON-OFF switch.

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Dielectric Strength

The maximum voltage a dielectric (nonconductor) can withstand without fracture.

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Dimensional Lumber

Lumber from 2 inches (50.8 mm) up to, but not including, 5 inches (127 mm) thick and 2 inches (50.8 mm) or greater in width.

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Diffuser

A circular, square, or rectangular air distributing outlet, usually in the ceiling, that has members to discharge supply air in several directions, mixing the supply air with the secondary air in the room.

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Diaphragm

A horizontal roof or floor structural element designed to resist lateral loads and transmit them to shear walls (vertical resisting elements).

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Double glass

Window or door in which two panes of glass are used with a sealed air space between. Also known as Insulating Glass.

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Door Buck

Structural element of a door opening. May be the same element as the frame if frame is structural, as in the case of heavy steel frames.

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Double-Hung Window

Window sash that slides vertically and is offset in a double track.

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Double Glazing

Two parallel sheets of glass with an air space in between.

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Dormer

An opening in a sloping roof, the framing of which projects out to form a vertical wall suitable for windows or other openings.

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Double hung window

A window with two vertically sliding sashes, both of which can move up and down.

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Double Tees

T-shaped precast floor and roof units that span long distances unsupported.

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Door operator

- An automatic garage door opener.

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Door stop

- The wooden style that the door slab will rest upon when it's in a closed position.

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Doorjamb, interior

The surrounding case into which and out of which a door closes and opens. It consists of two upright pieces, called side jambs, and a horizontal head jamb. These 3 jambs have the "door stop" installed on them.