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asphalt shingles and foam insulation

16 years ago

Putting foam insulation under roof deck and using asphalt shingles. Recently advised that #30 felt should not be used and that a water proof underlayment should be used due to some sort of water penetration that occurs through the shingles because of the hot and humid climate in south Louisiana. Told that because felt permeable, the moisture will get to the wood deck and that the foam will exacerbate the problem. Anyone know anything about this?

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