![]() However, regardless of the roof slope of the manufactured home, the vertical roof projection shall be included when determining the wind loading for split level or clerestory-type roof systems. (4) Whenever the roof slope does not exceed 20 degrees, the design horizontal wind loads required by § 3280.305(c)(1) may be determined without including the vertical roof projection of the manufactured home. (3) When engineering calculations are performed, allowable unit stresses may be increased as provided in the documents referenced in § 3280.304 except as otherwise indicated in §§ 3280.304(b)(1) and 3280.306(a). The roof live load or snow load shall not be considered as acting simultaneously with the wind load and the roof live or snow load and floor live loads shall not be considered as resisting the overturning moment due to wind. The design live loads and wind and snow loads shall be as specified in this section and shall be considered to be uniformly distributed. Design dead loads shall be the actual dead load supported by the structural assembly under consideration. Uncompressed finished flooring greater thanġ/8 inch in thickness must not extend beneath load-bearing walls that are fastened to the floor structure. In multistory construction, each story must be securely fastened to the story above and/or below to provide continuity and resist design loads in this part. Roof framing must be securely fastened to wall framing, walls to floor structure, and floor structure to chassis to secure and maintain continuity between the floor and chassis, so as to resist wind overturning, uplift, and sliding as imposed by design loads in this part. Each manufactured home must be designed and constructed as a completely integrated structure capable of sustaining the design load requirements of this part and must be capable of transmitting these loads to stabilizing devices without exceeding the allowable stresses or deflections. § 3280.305 Structural design requirements.
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