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Bryan Uhler walks through the building science behind constructing an unvented crawl space, focusing on the proper sequencing of insulation, soil gas and vapor control, air sealing, and drainage. He explains how horizontal and vertical insulation work together to reduce thermal bridging while a durable membrane helps control moisture and radon.

The discussion also covers variable vapor-permeable materials, seam sealing, dehumidification, and planning for mechanical systems and radon ventilation. Uhler emphasizes treating the assembly like a recipe, where product selection, compatibility, and installation sequence all work together to create a durable, conditioned crawl space.

Huge thanks to our episode sponsor, ISI Building Products. To learn more, visit: vipercs.com

Resources Mentioned:

ISI Viper Double Bond Tape
ISI Viper CS Crawl Space Vapor Retarder
ISI Viper Vapor Tape
Rockwool Smartrock
Pro Clima Intello Plus
Santa Fe Compact 070
Aerosmith EXIF Insulation Fastening Tools
Tescon Vana
Rockwool Comfortboard 80
Hultafors Insulation Knife
DAP Barrier Multi-Project Foam Sealant
PWT LVL
Polyguard Stretch Flex

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