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Base or baseboard - A trim board placed against the wall around the room next to the floor.

Evaporator coil - The part of a cooling system that absorbs heat from air in your home. Also see condensing unit.

Fire brick - Brick made of refractory ceramic material which will resist high temperatures. Used in a fireplace.

Heat pump - A mechanical device which uses compression and decompression of gas to heat and/or cool a house.

Jack rafter - A rafter that spans the distance from the wall plate to a hip, or from a valley to a ridge.

Ledger strip - A strip of lumber nailed along the bottom of the side of a girder on which joists rest.

Panel - A thin flat piece of wood, plywood, or similar material, framed by stiles and rails as in a door (or cabinet door), or fitted into grooves of thicker material with molded edges for decorative wall treatment.

Post -and -beam - A basic building method that uses just a few hefty posts and beams to support an entire structure. Contrasts with stud framing.

Pressure Relief Valve (PRV) - A device mounted on a hot water heater or boiler which is designed to release any high steam pressure in the tank to prevent tank explosions.

Pump mix - Special concrete that will be used in a concrete pump. Generally, the mix has smaller rock aggregate than regular mix.

Shingle - A covering used to finish the sides or the roof of a house.

Slab on grade - A type of foundation with a concrete floor which is placed directly on the soil. The edge of the slab is usually thicker and acts as the footing for the walls.

Three-four-five triangle - An easy, mathematical way to check whether a large angle is square. Measure three feet along one side, four feet along the other; if the corner is square, the diagonal distance between those two points will equal five feet.