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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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Rigid foam wraps the exterior of the foundation slab.

Rigid foam wraps the exterior of the foundation slab.
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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

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

Rigid Insulation Over Aggregate

Preview Image
Rigid Insulation Over Aggregate
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Slab independent of foundation wall

Slab independent of foundation wall
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Slab-on-grade foundation and safe room.

Slab-on-grade foundation and safe room.
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Slab-on-grade radon control techniques

Slab-on-grade radon control techniques
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Slab-on-grade with concrete masonry stem wall and exterior insulation

Slab-on-grade with concrete masonry stem wall and exterior insulation
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Slab-on-grade with concrete stem wall and slab insulation

Slab-on-grade with concrete stem wall and slab insulation
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Slab-on-grade with concrete stem wall and under slab insulation

Slab-on-grade with concrete stem wall and under slab insulation
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Slab-on-grade with integral grade beam and exterior and slab insulation

Slab-on-grade with integral grade beam and exterior and slab insulation
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Slab-on-grade with integral grade beam with exterior insulation

Slab-on-grade with integral grade beam with exterior insulation
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Slab-on-grade with masonry stem wall and interior and slab insulation

Slab-on-grade with masonry stem wall and interior and slab insulation
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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.

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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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.

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.

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.
Video:

Structural Foundation Slab | Madrona Passive House

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Structural system components of slab-on-grade foundation with grade beam

Structural system components of slab-on-grade foundation with grade beam
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Taping polyethylene sheeting at interior pier footings

Taping polyethylene sheeting at interior pier footings
Case Study:

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

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The basement is constructed with precast concrete walls lined with R-21.3 foil-faced rigid foam while an R-10 layer of XPS rigid foam covers the ground under the slab.

The basement is constructed with precast concrete walls lined with R-21.3 foil-faced rigid foam while an R-10 layer of XPS rigid foam covers the ground under the slab.
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The basement slab is wrapped in a blanket of insulation including R-27 of closed-cell spray foam under the slab and R-22 ICF blocks wrapping the slab edges.

The basement slab is wrapped in a blanket of insulation including R-27 of closed-cell spray foam under the slab and R-22 ICF blocks wrapping the slab edges.
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The builder laid down a 4-inch base of aggregate rock, then covered that with a plastic vapor barrier that is taped at all seams and around all penetrations before installing the rigid foam under-slab insulation.

The builder laid down a 4-inch base of aggregate rock, then covered that with a plastic vapor barrier that is taped at all seams and around all penetrations before installing the rigid foam under-slab insulation.
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The builder’s crews spray foam directly onto the ground to provide a vapor barrier and insulation layer under the slab.

The builder’s crews spray foam directly onto the ground to provide a vapor barrier and insulation layer under the slab.