Roofing Underlayment as WRB on Side Wall
What are the problems, if any, with using Roofing Underlayment on the side wall as a weather-resistant barrier, provided that the product has the desired physical characteristics (perm rating, etc...)?
Asked by J L
Posted Tue, 03/19/2013 - 17:15
Posted Tue, 03/19/2013 - 17:15
Tags: General questions
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J.L.,
All building codes require that a layer of asphalt felt, a roofing underlayment, be installed on walls as a water-resistive barrier (WRB). Other products, including plastic housewrap, have been approved as acceptable substitutes for the code-required layer of asphalt felt.
More information here: All About Water-Resistive Barriers.
Whatever you do, don't install synthetic roofing underlayment as a WRB on wall. Most synthetic roofing underlayments are vapor-impermeable. That's bad.
Posted Wed, 03/20/2013 - 09:07