Walls

Fastening Furring Strips to a Foam-Sheathed Wall

Posted on March 01,2015 by user-756436 in foam sheathing

UPDATED March 1, 2012 If you’re building a house with foam sheathing, and your siding is installed over vertical rainscreen strapping installed on top of the foam, how should you attach the strapping? Most builders screw the strapping through the foam into the studs; so far, so good. But what length screws should you use? And how closely should you space the screws?

How Risky Is Cold OSB Wall Sheathing?

Posted on March 01,2015 by user-756436 in cold OSB

During the winter months, wall sheathing is usually cold. Cold sheathing is risky, since it tends to accumulate moisture during the winter. Unless the sheathing can dry out during the summer months, damp sheathing can rot.

Calculating the Minimum Thickness of Rigid Foam Sheathing

Posted on March 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 March 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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