BASC Search | Building America Solution Center

Wrong - This batt insulation is not aligned with the subfloor and joists.

Wrong - This batt insulation is not aligned with the subfloor and joists.

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Rigid Foam Insulation Installed over Existing Foundation Slabs

Guide

Guide describing how to insulate an existing slab floor by adding rigid foam insulation over the slab then installing a floating subfloor.

Wrong - Sub-floor insulation is not properly installed or supported.

Wrong - Sub-floor insulation is not properly installed or supported.

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Right - Sub-floor insulation is properly installed and supported.

Right - Sub-floor insulation is properly installed and supported.

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Wrong - Sub-floor insulation has gaps, compression, and misalignment.

Wrong - Sub-floor insulation has gaps, compression, and misalignment.

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Rigid foam insulation and a thin slab were installed over the dirt and gravel of this sealed crawlspace

Rigid foam insulation and a thin slab were installed over the dirt and gravel of this sealed crawlspace

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The existing slab is retrofitted with epoxy paint, rigid foam insulation, sleepers (furring strips), and subfloor.

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The existing slab is retrofitted by coating with epoxy paint, then installing rigid foam insulation and a floating subfloor.

The existing slab is retrofitted by coating with epoxy paint, then installing rigid foam insulation and a floating subfloor.

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Right - Retrofit of an existing basement slab by adding dimple plastic mat, rigid foam insulation, and a floating subfloor.

Right - Retrofit of an existing basement slab by adding dimple plastic mat, rigid foam insulation, and a floating subfloor.

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Right - The existing basement slab is retrofitted by installing a dimple plastic drainage mat, rigid foam insulation, and a floating subfloor.

Right - The existing basement slab is retrofitted by installing a dimple plastic drainage mat, rigid foam insulation, and a floating subfloor.

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Air seal the floor above an unconditioned basement or crawlspace and make sure floor insulation is in full contact with the underside of the subfloor.

Air seal the floor above an unconditioned basement or crawlspace and make sure floor insulation is in full contact with the underside of the subfloor.

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Floor Above Unconditioned Basement or Vented Crawlspace

Guide

Guide describing how to air-seal and insulate the floor above an unconditioned basement or crawl space.

Water Management of Existing Crawlspace Floor

Guide

Guide providing information about treating bulk water drainage issues and moisture control measures in existing basements and crawl spaces.

Concrete Floor Problems, BSI-003

Reference

Information guide describing issues with concrete floors, in multiple climate zones.

Cold Climate Building Techniques and Concepts: building a raised floor

Video

Video from Cold Climate Housing Research Center describing building a raised floor in cold climates for air-sealing and insulation purposes.