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Posted By

DARRYL HALE (Flagstaff, AZ)

Category

Roofing

Posted Date

3/13/2018 12:00:00 AM

Forum Title

Frost inside attic question.

I got a call today for a roof tear off and replacement. I go out and the guy takes me in his attic and the decking looks good except for in 1 area?.it is kind of darkening. He goes on to tell me his house was built with plenty of soffit vents but no roof vents, so he had them added 10-15 years ago. I figured the darkening was from before he had good venting. Then he tells me he was up in his attic back in the winter and the dark area had frost all over that decking..and ice hanging on nails that came thru shingles. I ask if it frosted everywhere and he said no, just one part of the back side of home. This house is a ranch home?with a 6/12 roof and over 18? of unfaced insulation in attic. It is about a 2000 Square foot living area home and has a bunch of good, unblocked soffit vents and 8 roof vents. What causes this frost in attic? Could it be because it is so well insulated? Thanks!
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