Manufactured Home Construction: Thermal Protection Mobile App

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  §3280.

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  §3280.

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  3280.502(a) The following definitions are applicable to subpart F only:

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  Pressure envelope means that primary air barrier surrounding the living space which serves to li...

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  Thermal envelope area means the sum of the surface areas of outside walls, ceiling and floor, in...

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  §3280.

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  §3280.

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  Ceiling vapor retarders.

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  (a)(1) In Uo Value Zones 2 and 3, ceilings shall have a vapor retarder with a permanence of not g...

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  For manufactured homes designed for U.

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  Exterior walls.

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  3280.504(b)(1) Exterior walls shall have a vapor barrier not greater than 1 perm (dry cup method)...

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  unventilated wall cavities shall have an external covering and/or sheathing which forms the pres...

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  wall cavities shall be constructed so that ventilation is provided to dissipate any condensation...

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  Attic or roof ventilation.

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  3280.504(c)(1) Attic and roof cavities shall be vented in accordance with one of the following:

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  A minimum free ventilation area of not less than 1/300 of the attic or roof cavity floor area.

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  A mechanical attic or roof ventilation system may be installed instead of providing the free ven...

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  Single section manufactured homes constructed with metal roofs and having no sheathing or underl...

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  Parallel membrane roof section of a closed cell type construction are not required to be ventila...

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  The vents provided for ventilating attics and roof cavities shall be designed to resist entry of...

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  §3280.

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  Envelope air infiltration.

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  Envelope penetrations.

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  Joints between major envelope elements.

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  §3280.

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  Coefficient of heat transmission.

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  To assure uniform heat transmission in manufactured homes, cavities in exterior walls, floors, a...

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