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 |
§ 3280.506 - Heat loss/heat gain.
-
§ 3280.506 Heat loss/heat gain.
of this subpart(a) The manufactured home heat loss/heat gain shall be determined by methods outlined in §§ 3280.508 and 3280.509. The Uo (Coefficient of heat transmission) value zone for which the manufactured home is acceptable and the lowest outdoor temperature to which the installed heating equipment will maintain a temperature of 70 F shall be certified as specified in § 3280.510
506.. The Uo value zone shall be determined from the map in figure
below:(b) The overall coefficient of heat transmission (Uo) of the manufactured home for the respective zones and an indoor design temperature of 70 F, including internal and external ducts, and excluding infiltration, ventilation, and condensation control, shall not exceed the Btu/(hr.) (sq. ft.) (F) of the manufactured home envelope are as tabulated
in the table to this paragraph (b):
Table 1 to Paragraph (b)
Uo value zone Maximum coefficient of heat transmission 1 0.116 Btu/(hr.) (sq. ft.) (F). 2 0.096 Btu/(hr.) (sq. ft.) (F). 3 0.079 Btu/(hr.) (sq. ft.) (F). b(
shallc) To assure uniform heat transmission in manufactured homes, cavities in exterior walls, floors, and ceilings
must be provided with thermal insulation. (c) For insulation purposes, the fire separation wall between each single family attached manufactured home shall be considered an exterior wall (see subpart K of this part).
(d) Manufactured homes designed for Uo Value Zone 3 shall be factory equipped with storm windows or insulating glass.
[58 FR 55009, Oct. 25, 1993; 59 FR 15113, Mar. 31, 1994; 86 FR 2521, Jan. 12, 2021]