1/19/21 1/19/21

Dielectric Strength

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

1/19/21 1/19/21

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.

1/19/21 1/19/21

Direct Current (DC)

Electricity that flows in one direction.

1/19/21 1/19/21

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.

1/19/21 1/19/21

Disconnect

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

1/19/21 1/19/21

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

1/19/21 1/19/21

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.

1/19/21 1/19/21

Dewatering

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

1/19/21 1/19/21

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

1/19/21 1/19/21

Diaphragm

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

1/19/21 1/19/21

Double Tees

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

1/19/21 1/19/21

Double glass

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

1/19/21 1/19/21

Double hung window

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

1/19/21 1/19/21

Dormer

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

1/19/21 1/19/21

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.

1/19/21 1/19/21

Double Glazing

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

1/19/21 1/19/21

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.