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2018 National Home Improvement Estimator, All Rights Reserved Page 188

Door Terms
•Interior doors are usually 1-3/8" thick and have a “hollow” core. A wood frame is filled with a matrix of
corrugated paper and covered with a thin veneer.
•Exterior doors are usually 1-3/4" thick and solid core – again a thin veneer laid over a frame, but with
some other material filling the door cavity. This filler could be foam or composition board or even lumber.
Other popular exterior door choices include solid wood, steel and fiberglass.
•French doors are mostly glass, with one, to as many as fifteen panes set in wood sash.
•Insulated French doors have dual layers of glass, usually with a dividing grille installed between
layers.
•Colonial doors have raised decorative wood panels that resemble doors popular in colonial America.
Six or nine panels are most common.
•Flush doors are smooth and flat, with no decorative treatment.
•Louver doors include wood louvers that allow air to circulate but obscure vision, an advantage for
enclosing a closet, pantry or water heater.
•Grilles (grids) are laid over the glass in a single-pane French door to create the illusion of multiple
glass panes.
•Paint grade doors are usually primed at the factory and are designed to be painted after installation.
•Unfinished doors can be stained or given a clear coating, such as urethane, to enhance the beauty of
the wood.