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2021 IECC Climate Zone 4C: Unvented Attic, 2x4 Wall, Unvented Crawlspace

2021 IECC Climate Zone 4C: Unvented Attic, 2x4 Wall, Unvented Crawlspace

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2021 IECC Climate Zone 3A: Unvented Attic, 2x4 Wall with Exterior Insulation, Unvented Crawlspace

2021 IECC Climate Zone 3A: Unvented Attic, 2x4 Wall with Exterior Insulation, Unvented Crawlspace

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2021 IECC Climate Zone 3A: Unvented Attic, 2x4 Wall with Exterior Insulation, Unvented Crawlspace (with notes)

2021 IECC Climate Zone 3A: Unvented Attic, 2x4 Wall with Exterior Insulation, Unvented Crawlspace (with notes)

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The Scary Crawlspace

Reference

Article describing the risks associated with vented and unvented crawlspaces in different climate zones.

Closed Crawlspace - Finished Tour

Video

Video showing the components and design of an unvented, insulated crawlspace that provides a temperate climate for HVAC ducts.

Right - This unvented crawlspace is insulated along interior walls with rigid foam and air-sealed by covering the floor with vapor retarder that is sealed to the rigid foam which is taped at the seams.

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