In light of these events, it seems a review of roofing industry
guidelines for underlayment use as temporary weather protection is
For steep-slope roof systems, underlayment serves several
functions, including being a secondary weatherproofing barrier
should moisture infiltrate the primary roof covering; meeting
building code requirements and fire-rating classifications for roof
assemblies; and complying with manufacturers' warranties. In some
instances, underlayment also serves as temporary weather protection
until a primary roof covering is installed. But for underlayment to
perform adequately as temporary weather protection, it should shed
water without allowing...
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