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https://www.metalroofing.com/spirit/comment/10232/find/
Always inspect it closely for cracks and tears. How long it lasts depends a lot upon how bad the weather has been. Expecting it to last 90 days would not be unreasonable. The new synthetic underlayments seem to last longer.
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There is no specific warranty period on asphalt impregnated saturated felt underlayment. In most cases the manufacturer recommends the felt and shingles(or other suitable roofing material) be applied simultaneously. Felt underlayment should not be exposed to the weather, however it is common practice. As long as the product isn't torn or damaged, it doesn't have to be replaced prior to application of the final roof covering.
9/13/2007
Isaiah Industries, Inc.
9/16/2007
1/24/2008
Isaiah Industries, Inc.
1/24/2008