ú Demolition permit - Authorization to tear down and remove an existing structure.

Level - True horizontal. Also a tool used to determine level.

J Channel - Metal edging used on drywall to give the edge a better finished appearance when a wall is not "wrapped" Generally, basement stairway walls have drywall only on the stair side. J Channel is used on the vertical edge of the last drywall sheet

Limit switch - A safety control that automatically shuts off a furnace if it gets too hot. Most also control blower cycles.

Vapor barrier - A building product installed on exterior walls and ceilings under the drywall and on the warm side of the insulation. It is used to retard the movement of water vapor into walls and prevent condensation within them. Normally, polyethylene plastic sheeting is used.

Siding - The finish material of an exterior wall. Types include wood, aluminum, vinyl and hardboard.

Expansion joint - Flexible material between two surfaces that enables joints to ride out differing rates of expansion and contraction.

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