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Old 03-03-2018, 03:07 PM   #16
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Re: Insulating Cabin ceiling


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Originally Posted by Marson View Post
I would skip the ventilation personally. Venting isn't going to help the insulating value; it just provides a way for humidity to vent out of the building instead of condensing on the underside of the sheathing. It also can keep shingles cooler, but that is a non factor here. I would pack those rafter cavities full and and install a good 6 mil poly vapor/air barrier.

If you only use this cabin a few times in the winter, the amount of indoor humidity is really going to be negligible, and thus the chance of condensation in the roof cavity.. With only 2x4's in the lid, you might melt some snow off of the steel roof when you get your wood stove cranking, but that is no big deal.

I built a cabin for myself, and while I have more insulation than you are planning (9" of dense pack cellulose), there is no ventilation whatsoever. Have not seen a problem yet.
Any batt insulation that is better than others with regards to deterring mice?
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Old 03-03-2018, 09:29 PM   #17
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Re: Insulating Cabin ceiling


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Originally Posted by 13moe View Post
Any batt insulation that is better than others with regards to deterring mice?
Sorry, I don't know the answer to that one. Maybe roxul or something would be better? Do you have red squirrels? They will strip the fiberglass clean out of your walls/roof. Might be a good reason to go with rigid foam.

Probably too late for this advice, but when I built my cabin I was very anal retentive about not allowing any gaps in the sheathing, including very tight bird blocking between the rafters.
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