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I am building a garage/shop using a pole barn style truss that incorporates edge mounted 2x6's on 24" centers and 3' ag style metal panels. The purlins run parallel with the ridge.It will not be conditioned but I want to insulate the roof to reduce the condensation and drips. One idea is to set 1" rigid foam board on top of the purlins and put the metal roofing on top of that, leave the eave edges open and use some type of ridge ventalation to ventilate the small rib spaces. The other way is to attach the metal to the top of the purlins and the insulation to the bottom of the purlins and vent the area in between(approx.5.5") with a soffit type of vent on the gable ends.What is your opinion? Thank you for your time. Greg
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I suggest dropping the insulation down even lower -- beneath the vertical trusses. Then, use eave soffit vents and a ridge vent to create a nicer ventilated area beneath the roof panels.
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What is the drawback to putting galvanzide metal roof directly on foam insulation? I am building an in-law suite and I would like to have vaulted ceilings with exposed rafters. I thought about nailing 1x10" on top of the trusses then putting down felt followed by 2" foam insulation and galvanized corrugated roofing. Will the condesation form in the ridges?
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Unless you have a complete vapor barrier below the insulation, warm moist air will filter up around the insulation sheets and condense on the back of the roofing sheets.
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I am looking for an all in one solution for the roofing/insulation requirement of a small owner built cabin. Are there reliable insulated steel roofing panel systems equivalent to sips?
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There are insulated metal roof and wall panels available, currently used primarily for commercial applications.
To find sources, go to www.metalconstruction.org and search for insulated panel manufacturers from their member list.
10/16/2003
Or copy this URL: https://www.metalroofing.com/spirit/comment/2340/find/Isaiah Industries, Inc.
10/19/2003
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Or copy this URL: https://www.metalroofing.com/spirit/comment/2344/find/Isaiah Industries, Inc.
1/16/2004
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