Batter board
One of a pair of horizontal boards nailed to posts set at the corners of an excavation, used to indicate the desired level, also as a fastening for stretched …
Batten
Narrow strips of wood used to cover joints or as decorative vertical members over plywood or wide boards.
Batt
A section of fiberglass or rock-wool insulation measuring 15 or 23 wide by four to eight feet long and various thickness. Sometimes “faced” (meaning to have a paper covering …
Base or baseboard
A trim board placed against the {wall} around the room next to the {floor}.
Barge board
A decorative board covering the projecting rafter (fly rafter) of the gable end. At the cornice, this member is a fascia board.