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Image:

Vented crawlspace foundation insulated at floor joist with rigid foam.

Vented crawlspace foundation insulated at floor joist with rigid foam.
Case Study:

Veridian Homes: Cold Climate Region 40+% Energy Savings

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Walls in cold climates with a Class 3 vapor retarder (latex paint) and a vapor-open continuous insulation like mineral wool allow drying to the interior or the exterior

Walls in cold climates with a Class 3 vapor retarder (latex paint) and a vapor-open continuous insulation like mineral wool allow drying to the interior or the exterior
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Walls in cold climates with a polyethylene vapor barrier interior of the wall cavity should have either no exterior insulation or a vapor-open continuous insulation like mineral wool that allows drying to the exterior

Walls in cold climates with a polyethylene vapor barrier interior of the wall cavity should have either no exterior insulation or a vapor-open continuous insulation like mineral wool that allows drying to the exterior
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Weather resistant barrier is wrapped over the edge from roof to wall sheathing to provide a continuous air barrier at this transition.

Weather resistant barrier is wrapped over the edge from roof to wall sheathing to provide a continuous air barrier at this transition.
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When rigid foam insulation is applied to the exterior side of the wall cavity under the cladding, with seams taped and an air gap provided, it acts as a vapor barrier, air barrier, and rain screen.

When rigid foam insulation is applied to the exterior side of the wall cavity under the cladding, with seams taped and an air gap provided, it acts as a vapor barrier, air barrier, and rain screen.
Video:

Why Close a Crawlspace?

Image:

Wind-Damage Reduction as a Function of Retrofit Level

Wind-Damage Reduction as a Function of Retrofit Level
CAD File:

Window head at window frame wall

Preview Image
Window head at window frame wall
CAD File:

Window head at wood frame wall

Preview Image
Window head at wood frame wall
CAD File:

Window sill at wood frame wall

Preview Image
Window sill at wood frame wall
CAD File:

Window sill at wood frame wall

Preview Image
Window sill at wood frame wall
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With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit

With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit
Case Study:

WPPI GreenMax-Chambers Residence: Near Zero Energy Monitoring Summary

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Wrong - A typical vented crawlspace in North Carolina exhibits water leakage, poor drainage, and a low-quality vapor retarder that does not cover all of the ground surface and is not sealed to the walls.

Wrong - A typical vented crawlspace in North Carolina exhibits water leakage, poor drainage, and a low-quality vapor retarder that does not cover all of the ground surface and is not sealed to the walls.
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Wrong - A vapor barrier should cover the top of the concrete block pier support in the crawl space.

Wrong - A vapor barrier should cover the top of the concrete block pier support in the crawl space.
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Wrong - Class I vapor retarder over framed basement walls can cause condensation, mold, and rotting because plastic prevents drying to the inside; the outside should have waterproofing and vertical drainage, and the framing should be spaced from the wall.

Wrong - Class I vapor retarder over framed basement walls can cause condensation, mold, and rotting because plastic prevents drying to the inside; the outside should have waterproofing and vertical drainage, and the framing should be spaced from the wall.
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Wrong - Crawl space floor is missing a vapor barrier.

Wrong - Crawl space floor is missing a vapor barrier.
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Wrong - Debris and potentially hazardous wiring are littering the crawl space floor, which also should be covered with a vapor barrier.

Wrong - Debris and potentially hazardous wiring are littering the crawl space floor, which also should be covered with a vapor barrier.
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Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.

Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.
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Wrong - Flashing tape was not pressure adhered to the housewrap; pressure sensitive tape must be rollered for proper adhesion.

Wrong - Flashing tape was not pressure adhered to the housewrap; pressure sensitive tape must be rollered for proper adhesion.
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Wrong - Lack of a weather-resistant barrier allowed water to get behind the siding and rot the framing in this corner rim joist area.

Wrong - Lack of a weather-resistant barrier allowed water to get behind the siding and rot the framing in this corner rim joist area.
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Wrong - Lack of house wrap or weather resistant barrier lead to significant water damage behind the brick veneer.

Wrong - Lack of house wrap or weather resistant barrier lead to significant water damage behind the brick veneer.
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Wrong - Missing house wrap contributed to water damage of fascia boards.

Wrong - Missing house wrap contributed to water damage of fascia boards.