foam thickness

Calculating the Minimum Thickness of Rigid Foam Sheathing

Posted on April 01,2015 by user-756436 in condensation

UPDATED on August 26, 2014 with new information on flash-and-batt requirements in the 2012 IRC If you plan to install exterior rigid foam on the walls of your house, how thick should the foam be? Although the GBA Web site has addressed this question several times in our Q&A column and various blogs, the question continues to perplex readers. New questions along these lines come our way regularly. The last time I answered the question was at the end of a long, very technical blog. In this blog, I'll cut to the chase.

Are Dew-Point Calculations Really Necessary?

Posted on April 01,2015 by user-756436 in condensation

Most builders understand that condensation can form when warm, moist air encounters a cold surface. Condensation is bad, and builders want to avoid it. There’s a solution, though: According to building scientists, we can prevent condensation problems in walls by determining a wall’s temperature profile and performing a dew-point calculation. This calculation may require the use of a psychrometric chart.

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