Vapor Diffusion
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Vapor-Variable Membranes
An explanation of how 'smart' vapor retarders work, when they are needed, and the available products
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Vapor: Pressure, Permeance, and Permeability
A few mental visuals to help understand that elusive moisture menace
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Martin’s Six Rules for Polyethylene
A fresh look at the use of interior plastic sheeting on walls
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My Top 10 Building Science and Energy Efficiency Ideas of 2015
A year-end review of the articles and ideas that made me think
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All About Vapor Diffusion
Even if a material has no holes, water can often move right through it
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Outward Vapor Diffusion
Airtight wall and roof assemblies must accound for outward wintertime vapor diffusion to prevent moisture accumulation problems
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The Physics of Water in Porous Materials
Water has unique properties that govern its interaction with wood and other construction materials
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Do I Need a Vapor Retarder?
Someday, builders will stop asking this recurring question — but unfortunately, that day has not yet come
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When Sunshine Drives Moisture Into Walls
Because of inward solar vapor drive, vapor diffusion from the outside inward is often more worrisome than vapor diffusion from the inside outward — so you need a good vapor barrier strategy
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Forget Vapor Diffusion — Stop the Air Leaks!
Building codes are finally beginning to recognize that air barriers matter more than vapor barriers
