Design & Construction Resources
475 Does WUFI®: Mold Potential and Historic Masonry Retrofits in Climate Zone 6 (Burlington, VT)
475 Does WUFI®: Mold Potential and Historic Masonry Retrofits in Climate Zone 6 (Burlington, VT) A key piece of the puzzle as we decarbonize our building stock is successfully retrofitting...
Read MoreCan't vent at valleys and dormers? Use a smart vapor retarder (not foam)
Straight gable roofs are easy to vent, and ideally would be vented. But often we end up with dormers, valleys and other complications. In this post we feature Alex Wilson's house...
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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...
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Unvented Flat Roofs: A Technical Discussion
Flat roofs have often been built with the insulation all on top of the vapor closed drainage plane - as this avoids dew point condensation issues inboard of the roofing....
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A High Performance Roof Should Be Vented: How to Do This Properly
Vented roofs work, and are the best solution to eliminate many issues that appeared when we started to insulate buildings - 'leaks' caused by condensation, mold, water damaged sheathing and...
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Blower Door Protocol for Passive House Certification
Automated blower door test according to EN13829 with DG700 manometer controlled by laptop Building air-tightness below 0.6 air changes per hour at 50 pascals pressure (0.6ACH50) is a simple target...
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