When is a continuous self-adhered membrane required on a roof?
Typical roofing details call for one course of self-adhered membrane (aka fully-adhered membrane waterproofing, ice & water shield, etc.) at roof edges and valleys. A continuous cover of self-adhered membrane, however, is often used (see BSC's Figure 9, RR-0404: Roof Design for an example) over roofs with metal roofing and spray foam in the cavity. Under what conditions is a continuous cover of self-adhered membrane required / recommended ?
- all metal roofing over unvented assemblies?
- only in cold climates?
- only in very cold climates?
- only under metal roofing when no exterior rigid is used?
- only when spray foam (open or closed) is used in the cavity?
- ..... etc.
Posted Dec 8, 2009 7:12 PM ET
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Can Unvented Roof Assemblies be Insulated with Fiberglass If I use Rigid foam on the exterior of the sheathing?