The complete source for building, designing, and remodeling green homes

Product Guide
Vapor-Variable Membranes

An explanation of how 'smart' vapor retarders work, when they are needed, and the available products
Building Science
The Ratio Rule for Hybrid Roof Insulation

Ensuring the right combination of R-values above and below a roof deck
Musings of an Energy Nerd
All About Vapor Diffusion

Even if a material has no holes, water can often move right through it
Building Science
Permeability of Oriented Strand Board

A look at whether the claims around OSB's permeability ratings prove true in practice

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Vapor-Variable Membranes