1/19/21 1/19/21

Cold-Rolled Steel

Steel rolled to the final desired shape at a temperature at which it is no longer plastic.

1/19/21 1/19/21

Collar beam

Nominal 1- or 2-inch-thick members connecting opposite roof rafters. They serve to stiffen the roof structure.

1/19/21 1/19/21

Cohesion

The molecular forces between particles within a body which acts to unite them.

1/19/21 1/19/21

Collar

Preformed flange placed over a vent pipe to seal the roofing above the vent pipe opening. Also called a vent sleeve.

1/19/21 1/19/21

Cohesive Soil

A soil that when unconfined has considerable cohesion when submerged and considerable strength when air dried.

1/19/21 1/19/21

Cogeneration Systems

Systems using fossil fuel, geothermal energy, wind, or solar energy to produce electricity and heat.

1/19/21 1/19/21

Cofferdam

A temporary watertight enclosure around an area of water-bearing soil or an area of water from which water is pumped allowing construction to take place in the water-free area.

1/19/21 1/19/21

Cold air return

The ductwork (and related grills) that carries room air back to the furnace for re-heating.

1/19/21 1/19/21

Collector Street

A street into which minor streets empty and which leads to a major arterial.

1/19/21 1/19/21

Cohesionless Soil

A soil that when unconfined has little or no cohesion when submerged and no significant strength when air dried.

1/19/21 1/19/21

Combustion chamber

The part of a boiler, furnace or woodstove where the burn occurs; normally lined with firebrick or molded or sprayed insulation.

1/19/21 1/19/21

Comfort Zone

Any combination of temperature and himidity in which the average person feels comfortable.

1/19/21 1/19/21

Combustion air

The duct work installed to bring fresh, outside air to the furnace and/or hot water heater. Normally 2 separate supplies of air are brought in: One high and One low.