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Concrete crawl space wall with interior spray foam insulation

Concrete crawl space wall with interior spray foam insulation

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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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Rigid Foam Board Interior Insulation for Existing Foundation Walls

Guide

Guide describing how to insulate closed crawlspace walls and band joist areas with rigid foam board insulation.

Vented crawlspace foundation insulated at floor joist with rigid foam.

Vented crawlspace foundation insulated at floor joist with rigid foam.

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Vented crawlspace foundation insulated under floor joists with rigid foam.

Vented crawlspace foundation insulated under floor joists with rigid foam.

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Moisture problems must be dealt with before sealing and insulating a crawlspace

Moisture problems must be dealt with before sealing and insulating a crawlspace

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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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Keeping The Heat In - Chapter 6: Basement Insulation Floors, Walls and Crawl Spaces

Reference

Information sheet providing links and resources for insulating basements in cold climates.

Exterior XPS basement insulation is correctly installed to completely cover the foundation wall

Exterior XPS basement insulation is correctly installed to completely cover the foundation wall

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This house with interior insulated crawlspace is protected from pests with termite shield at sill plate, borate-treated framing, flashing at end of wall insulation, and a termite inspection gap at the top of the rigid foam

This house with interior insulated crawlspace is protected from pests with termite shield at sill plate, borate-treated framing, flashing at end of wall insulation, and a termite inspection gap at the top of the rigid foam

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Unvented air-sealed crawlspace is insulated along the perimeter walls with rigid foam

Unvented air-sealed crawlspace is insulated along the perimeter walls with rigid foam

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Right - This unvented crawlspace is insulated along the walls and between the floor joists with 2-inch foil-faced polyisocyanurate; a termite inspection gap is visible above of the wall insulation and below the band joist.

Right - This unvented crawlspace is insulated along the walls and between the floor joists with 2-inch foil-faced polyisocyanurate; a termite inspection gap is visible above of the wall insulation and below the band joist.

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Air seal your crawlspace access hatch with weatherstripping and insulate the hatch panel with rigid foam and/or batt insulation to minimize air leakage at this common air leakage location.

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Right - Spray foam insulates and air-seals the stone walls of this unvented crawlspace.

Right - Spray foam insulates and air-seals the stone walls of this unvented crawlspace.

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This floor assembly above a vented crawlspace controls vapor and heat transmission by using foil-faced isocyanurate rigid foam insulation installed underneath the floor joists and fiberglass insulation in the floor joist cavities

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Unvented crawl space with interior insulation - designed for termite resistance in heavily infested areas

Unvented crawl space with interior insulation - designed for termite resistance in heavily infested areas

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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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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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Batt insulation has been attached to this crawlspace hatch cover using twine and heavy-duty staples.

Batt insulation has been attached to this crawlspace hatch cover using twine and heavy-duty staples.

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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.

Rigid foam insulation applied to the crawlspace walls, allowing a 3-in. pest control inspection strip at the top

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Unvented concrete masonry unit crawl space with exterior insulation - designed for termite resistance in moderately infested areas

Unvented concrete masonry unit crawl space with exterior insulation - designed for termite resistance in moderately infested areas

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Wrong - Crawlspace hatches should have weatherstripping and insulation when excluding the crawlspace from the building thermal envelope.

Wrong - Crawlspace hatches should have weatherstripping and insulation when excluding the crawlspace from the building thermal envelope.

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Wrong – A clothes dryer that vents to the crawlspace can contribute moisture to the crawlspace; this can result in damp, molding, and rotting insulation

Wrong – A clothes dryer that vents to the crawlspace can contribute moisture to the crawlspace; this can result in damp, molding, and rotting insulation

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Right - the vapor barrier is extended up the sides of the piers in this crawlspace, which is sealed and insulated to house the HVAC ducts.

Right - the vapor barrier is extended up the sides of the piers in this crawlspace, which is sealed and insulated to house the HVAC ducts.

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Because the above-grade potions of the wall lack exterior insulation, condensation and even ice form during cold winter conditions

Because the above-grade potions of the wall lack exterior insulation, condensation and even ice form during cold winter conditions

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A concrete slab-on-grade foundation with exterior insulation, which can be elevated above the local grade as a flood-prevention strategy.

A concrete slab-on-grade foundation with exterior insulation, which can be elevated above the local grade as a flood-prevention strategy.

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The sealed, insulated crawlspace is a clean, dry location to house the main floor heating ducts and also provides bonus storage space.

The sealed, insulated crawlspace is a clean, dry location to house the main floor heating ducts and also provides bonus storage space.

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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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