Code of Federal Regulations (Last Updated: July 5, 2024) |
Title 24 - Housing and Urban Development |
Subtitle B - Regulations Relating to Housing and Urban Development |
Chapter XX - Office of Assistant Secretary for Housing - Federal Housing Commissioner, Department of Housing and Urban Development |
Part 3280 - Manufactured Home Construction and Safety Standards |
Subpart F - Thermal Protection |
§ 3280.502 - Definitions.
Latest version.
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§ 3280.502 Definitions.
(a) The following definitions are applicable to subpart F only:
(1) Pressure envelope means that primary air barrier surrounding the living space which serves to limit air leakage. In construction using ventilated cavities, the pressure envelope is the interior skin.
(2) Thermal envelope area means the sum of the surface areas of outside walls, ceiling and floor, including all openings. The wall area is measured by multiplying outside wall lengths by the inside wall height from floor to ceiling. The floor and ceiling areas are considered as horizontal surfaces using exterior width and length.