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

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Comprehensive water management features include a capillary break (≥ 6-mil polyethylene sheeting) at all crawlspace floors

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An uninsulated (or existing insulated) basement slab is retrofitted to reduce moisture transmission by sealing with epoxy paint.

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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.

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

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Taping polyethylene sheeting at interior pier footings

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Spray foam extends down the foundation wall to the slab, which has been retrofitted by adding dimple plastic drainage mat and rigid foam insulation.

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Rigid insulation and water control layers are installed on the exterior of a flat foundation wall; spray foam insulates the rim joist

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Spray foam extends down the inside of the foundation wall to the uninsulated slab; because the wall lacked exterior perimeter drainage, the slab was cut and an interior footing drain was installed.

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Spray foam insulation extends down the foundation wall to the slab, which has been retrofitted by cutting the slab to install drainage mat against the wall and a new perimeter footing drain, along with rigid foam plastic above the slab.

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Exterior Insulation for Existing Foundation Walls

Guide

Guide describing how to insulate a new foundation wall or an existing foundation wall by adding rigid insulation to the exterior side.

Capillary Break at Crawlspace Floor - Polyethylene Sheeting under Concrete Slab

Guide

Guide describing how to install a capillary break to help manage moisture in foundations.

Water Management of Existing Basement Floor

Guide

Guide describing how to retrofit an existing basement floor or slab to reduce moisture issues.

Capillary Break Beneath Slab - Polyethylene Sheeting or Rigid Insulation over Aggregate or Sand and Geotextile Mat

Guide

Guide describing how to install a capillary break under a slab foundation using either polyethylene sheeting or rigid insulation installed over aggregate or over sand and geotextile matting.

Insulating Crawl Space Floors in Existing Homes

Guide

Guide describing how to upgrade a crawlspace floor in an existing home by adding insulation.

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.