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 15# or 30#
Felt ~
Felt paper is most commonly used as a moister barrier between
sheetrock and brick or siding on a home or business. In roofing, felt
paper is used to keep the chemicals sprayed on plywood off the backside of
the laminated shingles. The 15# felt is the preferred weight of all major
manufacturers because it absorbs less condensation allowing the shingles
to last longer. The 30# felt is mostly used on very steep roofs to help
installers get a better grip to walk on and 30# felt is also mandatory in
hurricane zones. |
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