(a) *  *  *

(3) In multi-story manufactured homes, the ceiling vapor retarder is permitted to be omitted when the story directly above is part of the same manufactured home.

(b) Exterior walls. Exterior walls must be provided with a system or method to manage moisture and vapor accumulation with one of the elements in paragraphs (b)(1) through (4) of this section. For purposes of the requirement in this paragraph (b), the fire separation wall between each attached manufactured home must be considered to be an exterior wall. See subpart K of this part

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