A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Controlling Moisture in the Roof Cavities of Manufactured Housing
A detailed computer analysis is conducted to investigate whether moisture problems occur in the roof cavity of manufactured homes constructed in compliance with the current Department of Housing and Urban Development (HUD) Standards for manufactured housing. The current HUD Standards require a ceiling vapor retarder, but do not require outdoor ventilation of the roof cavity. In cold climates, the analysis revealed that moisture accumulates at lower roof surface and poses a risk of material degradation. The analysis found the following combination of passive measures to be effective in preventing detrimental winter moisture accumulation at lower surface of the roof: (1) providing a ceiling vapor retarder, (2) sealing penetrations and openings in the ceiling construction, and (3) providing natural ventilation of the roof cavity. In addition, the performance of a roof cavity subjected to a hot and humid climate is investigated. The analysis revealed that outdoor ventilation of the roof cavity causes the monthly mean relative humidity at the upper surface of the vapor retarder to exceed 80%. The condition is conducive to mold and mildew growth.
Controlling Moisture in the Roof Cavities of Manufactured Housing
A detailed computer analysis is conducted to investigate whether moisture problems occur in the roof cavity of manufactured homes constructed in compliance with the current Department of Housing and Urban Development (HUD) Standards for manufactured housing. The current HUD Standards require a ceiling vapor retarder, but do not require outdoor ventilation of the roof cavity. In cold climates, the analysis revealed that moisture accumulates at lower roof surface and poses a risk of material degradation. The analysis found the following combination of passive measures to be effective in preventing detrimental winter moisture accumulation at lower surface of the roof: (1) providing a ceiling vapor retarder, (2) sealing penetrations and openings in the ceiling construction, and (3) providing natural ventilation of the roof cavity. In addition, the performance of a roof cavity subjected to a hot and humid climate is investigated. The analysis revealed that outdoor ventilation of the roof cavity causes the monthly mean relative humidity at the upper surface of the vapor retarder to exceed 80%. The condition is conducive to mold and mildew growth.
Controlling Moisture in the Roof Cavities of Manufactured Housing
D. M. Burch (author)
1992
51 pages
Report
No indication
English
Construction Materials, Components, & Equipment , Roofs , Moisture resistance , Construction materials , Prefabricated buildings , Attics , Humidity , Porosity , Moisture content , Ventilation , Permeability , Diffusion , Boundary conditions , Interfaces , Residential buildings , Manufactured housing
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