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TOPIC: Insulation Concerns

Insulation concern

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Building a camp with 8/12 pitch metal roofing over 2x4 purlins, tar paper, 3/4" decking atached to 2x10 rafters, 16" O.C. with collar beams, 4' O.C. NO SOFFIT Vents(builder says not required) and ridge is caped, but underside of decking is only about 1/4" to 3/4" opening. Area between rafters has R-30 fibergalss insulation installed. Catherdal ceiling-T&G paneling to be installed up to and ACROSS collar beams. Last weekend-VERY HUMID- insulation at inside peak was very wet-From humidity? Was wondering if I should be concerned, and how to fix problem if need be. Thanks
Greg Kriger

4/28/2009
Thanks Greg. Unless I am mistaken we corresponded direct via email about this and hopefully I was able to help some. Let me know if that was actually someone else I corresponded with. Thanks. Todd Miller
Todd Miller
Isaiah Industries, Inc.

4/29/2009
Todd, I don't see any e-mail from you, could you please try again or should I try to call you? Thanks for your help.
Greg Kriger

4/29/2009
Perhaps it was someone else. Sorry. Ideally, from the inside out, you want drywall, vapor barrier, insulation, vented airspace, decking, underlayment, roofing. Anything less than this could result on condensation issues. In some minor cases you may control things with a dehumidifier insider the structure or with a ceiling fan mounted at the peak to keep air circulating. I hope this helps. Todd Miller
Todd Miller
Isaiah Industries, Inc.

4/29/2009
Todd, So as I understand you I would have to remove the insulation that is place, install soffit vents, install venting between insulation and underside of decking-between rafters, then open up decking to ridge cap?
Greg Kriger

4/29/2009
Yes. Good summary Todd Miller
Todd Miller
Isaiah Industries, Inc.

5/2/2009