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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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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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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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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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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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Closed Crawlspace - Finished Tour

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

Pest proofing of this unvented crawlspace includes a metal termite shield that extends out from sill plate, metal flashing wrapping bottom of exterior rigid foam, and a termite inspection gap above interior rigid foam.

Pest proofing of this unvented crawlspace includes a metal termite shield that extends out from the sill plate, metal flashing wrapping the bottom of exterior rigid foam, and a termite inspection gap above interior rigid foam.

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The Scary Crawlspace

Reference

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