18 Jun '11, 8pm

Proper materials for moisture control with a SIP roof #green

I'd like to suggest a specific assembly for a SIP roof in your climate. A SIP roof, while performing very well, is extremely sensitive to moisture in the panel seams. Air infiltration can is still a problem in this assembly when the steps that Martin outlined are followed correctly: "The most important step is to get a good air barrier. I like redundant systems -- spray foam in the SIP seams, plus high quality interior tape at every seam." Further air infiltration problems can exist in three significant ways over the life of the building: 1, The SIP panel has an internal network of wire chase's that make air-sealing below 1.5 ACH a significant challenge to many builders. Interior vapor laden air can travel this network and reach the interior side of the exterior OSB skins of the roof panel. 2, Building movement over time can affect the interior joint "foaming" beyond what ...

Full article: http://www.greenbuildingadvisor.com/community/forum/green...

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