Insulation

From Foam Roofing and Solar Power Wiki

Insulation

(1) Any of a variety of materials designed to reduce the flow of heat, either from or into a building. (See also Thermal Insulation.)

(2) Generally, any material which slows down or retards the flow or transfer of heat. building insulation types are classified according to form as loose fill, flexible, rigid, reflective, and foamed in place. all types are rated according to their ability to resist heat flow (r value).

(3) In electrical contracting, rubber, thermoplastic, or asbestos wire covering. the thickness of insulation varies with wire size and type of material, application or other code limitations.

(4) Materials with low thermal conductivity characteristics that are used to slow the rate of heat transfer.