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we own a30x28 log cabin and are having a bad time with our roof. camp has 4x6 rafters, tongue and grooves boards, 2 layers of 4x8 insulation, 1'air space, plywood and asphalt shingles. Roof started to show water marks. Took the roof and insulation off. Replaced with closed cell foam insulation ,plywood and new shingles. Two years later our roof looks like a waffle board, bumps and sags all over. Would you have some idea of why I'm having such a hard time with this roof, Thanx JOE


Sounds like a venting problem to me. You should get a couple of roofing companies to look at it for a couple of different opinions.

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