Topic: Civil & Architectural Engineering
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Guideline For Insulating Metal Buildings With Spray Applied Polyurethane Foam
Spray-applied polyurethane foam can provide an excellent insulating and/or weatherproofing augmentation to metal buildings. Polyurethane foam forms an integral bond with the metal building surface conforming to irregular surface profiles and providing an effective air seal.
Spray polyurethane foam (SPF) may be applied to metal building exteriors or interiors. When applied to exterior surfaces, the SPF must be covered with an elastomeric coating for weather protection. When applied to interior surfaces, the SPF must be covered with a 15-minute thermal barrier for fire protection. Vapor retarders may be required depending on the particulars of the project.
if the metal buildings intended use is as a cooler, a vapor retarder will likely be required if the SPF is applied to the building's exterior surface (the warm side of the building). Conversely, if the building site is in a cool climate and the building will be heated, a vapor retarder will likely be required if the spray foam is applied to the building's interior surface.
When polyurethane foam is spray applied to interior surfaces, it must be protected by a 15-minute thermal barrier. Various types of thermal barriers are available which may be sprayed, troweled, or mechanically fastened to the foam. For additional information on thermal barriers, see SPFA Publication Thermal Barriers for the Spray Polyurethane Foam Industry , Stock Number AY-126.
Source: www.sprayfoam.org
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