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 Tue, 12/08/2009 - 19:12
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Since drywall has a permeance of 0.02 liter/sec - m at 75 PA is ever possible to have sheathing dry to the interior of the home?