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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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Technology Solutions Case Study: Exterior Rigid Foam Insulation at the Edge of a Slab Foundation, Fresno, California

Case Study

Case study describing installation of exterior rigid foam insulation on a slab foundation.

2021 IECC Climate Zone 5: Vented Attic, 2x4 Wall, Interior Insulated Basement

2021 IECC Climate Zone 5: Vented Attic, 2x4 Wall, Interior Insulated Basement

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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 - Potential locations for crawlspace insulation: vapor sheeting should always cover the floor with insulation (a) outside walls, (b) inside walls, (c) both sides of walls, (d) sandwiched inside walls, or (e) under the first floor.

Right - Potential locations for crawlspace insulation: vapor sheeting should always cover the floor with insulation (a) outside walls, (b) inside walls, (c) both sides of walls, (d) sandwiched inside walls, or (e) under the first floor.

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Right – Rigid foam was attached to the tops of the precast foundation walls to form an insulated edge for the floor slab.

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2021 IECC Climate Zone 5: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

2021 IECC Climate Zone 5: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

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2021 IECC Climate Zone 4C: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

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2021 IECC Climate Zone 6: Vented Cathedral ceiling, 2x6 Wall, interior Insulated Basement

2021 IECC Climate Zone 6: Vented Cathedral ceiling, 2x6 Wall, interior Insulated Basement

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2021 IECC Climate Zone 6B: Vented Attic, Interior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zones 7 and 8: Vented Attic, Interior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zones 7 and 8: Vented Attic, Exterior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5C: Vented Attic, Interior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 6A: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

2021 IECC Climate Zone 6A: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

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2021 IECC Climate Zone 6A: Vented Attic, Exterior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 6B: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

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2021 IECC Climate Zone 4C: Vented Attic, Exterior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 4C: Vented Attic, Interior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5B: Vented Attic, Exterior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5B: Vented Attic, Interior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5C: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5C: Vented Attic, Exterior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5A: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5A: Vented Attic, Exterior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5A: Vented Attic, Interior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zone 5B: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

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2021 IECC Climate Zone 6B: Vented Attic, Exterior Double Wall, Interior Insulated Basement

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2021 IECC Climate Zones 7 and 8: Vented Cathedral Ceiling, 2x6 Wall, Interior Insulated Basement

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Technology Fact Sheet Slab Insulation: Improve Comfort and Save Energy in Homes with Slab-on-Grade Floors

Reference

Brochure describing insulation approaches for homes with slab-on-grade floors.

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