T & G, tongue and groove - A joint made by a tongue (a rib on one edge of a board) that fits into a corresponding groove in the edge of another board to make a tight flush joint. Typically, the subfloor plywood is T & G.

Chase - A framed enclosed space around a flue pipe or a channel in a wall, or through a ceiling for something to lie in or pass through.

Ground iron - The plumbing drain and waste lines that are installed beneath the basement floor. Cast iron was once used, but black plastic pipe (ABS) is now widely used.

Cornice - The projection from a building that crowns or finishes the edge. Horizontal projection at the top of exterior wall which finishes the eaves of a building.

Plan view - Drawing of a structure with the view from overhead, looking down.

Concrete - The mixture of Portland cement, sand, gravel, and water. Used to make garage and basement floors, sidewalks, patios, foundation walls, etc. It is commonly reinforced with steel rods (rebar) or wire screening (mesh).

Compression web - A member of a truss system which connects the bottom and top chords and which provides downward support.

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