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New Mold Growth Index and Safe Double-Stud Walls: WUFI Pro Shows INTELLO Plus is Key

New Mold Growth Index and Safe Double-Stud Walls: WUFI Pro Shows INTELLO Plus is Key Double-stud walls have been regarded as a simple to build, low-cost, high-performance solution since the energy crisis in the 1970's.  (See our blog post The Double-Stud Wall Simplified: Low-Cost High Performance, and free CAD details)  Pack them righ … read more

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How To Stay Airtight Without A Service Cavity

How To Stay Airtight Without A Service Cavity Intro / Caveat As you may know, 475 recommends you use a service cavity on the interior of high performance, airtight building envelopes. We've enumerated the values of service cavities many times, in many ways. So to be clear, our stance on the subject remains firm: service cavities are the b … read more

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The Returns From Indiana Are In: 0.4 ACH50 For The Win!

The Returns From Indiana Are In: 0.4 ACH50 For The Win! Vertical furring strips make a vented rainscreen Cruz, Clinton, Trump, Sanders...Warkentien? Dave Warkentien lives in Indiana and recently earned winning numbers: 0.4 ACH50.   He also got winning returns on power usage: at negative 457kWh for the first three months of 2016 (an … read more

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Keeping Sheathing Dry in High-R Double-Stud Walls - a WUFI study

Keeping Sheathing Dry in High-R Double-Stud Walls: a WUFI study Double-stud walls have become a popular and cost efficient way to build well-insulated envelopes: two 2x4's spaced apart easily makes a R-40+/10.5" thick wall. Such walls also include a thermal break and can be insulated with densepacked cellulose or fiberglass, both quickl … read more

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