deglosser: A chemical that destroys the smooth, glossy finish on a surface so that the surface is rougher, allowing the paint to grip the surface.

demi-canopy: An artificial canopy, usually in a half round, which is draped above a bed in place of a headboard.

distressing: Distressing is the process of making a piece of furniture look artificially aged by adding nicks and scratches to the finish.

dormer valley: The dormer valley is the point at which the dormer meets the rest of the roofline.

double-hung windows: The most popular window style, which has an upper and a lower sash that move vertically in separate channels. The sashes are separated by a small piece of wood called a parting strip; the upper and lower sashes also have meeting rails that helps keep the seal tight between the rails. A lock secures the sashes together to create a tight seal and minimize air loss.

dressmaker details: Pleats, ribbon, welting, and other trim as might be used by a dressmaker.

drop cloth: A drop cloth is a piece of fabric or plastic that is used to protect items from paint or splatter.

dropped pattern: Dropped-pattern wallpaper calls for careful planning, because the pattern needs to be aligned both horizontally and vertically with the strip of wallpaper on both sides. Because of the dual alignment, dropped patterns incur a good deal of waste in order to have enough paper to make all the necessary pattern matches. There are two different kinds of dropped patterns: half-drops and multiple drops.

drum sander: A large machine used for sanding floors that is roughly the size of a lawn mower.

dry rot: The damage caused by a fungus that eats away at wood causing extensive damage.

drywall: Drywall is a construction material that is made of plasterboard in the center with a heavy paper on the outside. Drywall is used to finish the walls in most houses made since the mid-1960s.

dye lot: Dye lot refers to the color pass that is used to make a certain batch of tiles or wallpaper rolls. There can be color variations from dye lot to dye lot even though the pattern name and number do not change.