Vapor Barrier
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Vapor Retarders for Basements and Crawlspaces
Do you need a vapor retarder on your basement wall? How about your basement floor?
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Building Codes Update Vapor Retarder Requirements
The code is more complicated than ever
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Vapor: Pressure, Permeance, and Permeability
A few mental visuals to help understand that elusive moisture menace
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The BS* + Beer Show: Do I Need a Vapor Barrier?
This episode tackles one of the most commonly asked building science questions on GBA and beyond
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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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Do These Walls Need a Vapor Barrier?
The owner-builder's uncle suggests poly in both the walls and ceiling. Is he right?
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Worries About Trapping Moisture
While some types of wall assemblies and roof assemblies are risky, many worries about ‘trapping moisture’ are baseless
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Smart Vapor Retarders for Walls and Roofs
Can a smart vapor retarder be used to make an otherwise risky assembly safe?
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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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Does This Roof Need a Vapor Retarder?
The open-cell spray foam in the rafter bays provides an air barrier but not a vapor retarder
