BP CANADA #15 PLAIN ROOF FELT RF403N | RONA- roofing felt 15 vs 30 ,Whereas rolled felt paper (15#) is water proof, it is not UV resistant, nor wind resistant. It will not withstand the elements unprotected, as an underlayment it provides the lower level to a 2 part roof materials. The top layer of shingles protect the roofing felt. Look for ...Double vs Single Layer Felt Underlayment on RoofsRoofing felt underlayment layers: Single layer vs. double layer or double-coverage roofing underlayment are defined here. We explain when double-coverage of felt underlayment is recommended and we describe how to figure out if your roofer installed a single-layer or double coverage layer (or maybe no layer) of felt under the roof shingles.
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