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Slab independent of foundation wall

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Flood-Resistant Raised-Slab Foundations

Guide

Guide describing ways to construct a raised-slab foundation to increase a home's resistance to floods.

Structural Foundation Slab | Madrona Passive House

Video

Video explaining the structural foundation slab in a passive house.

Drainage techniques for slab-on-grade foundations

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Exterior Edge Insulation for Existing Foundation Slabs

Guide

Guide describing how to install slab edge insulation when retrofitting existing slab-on-grade foundations.

Caulk the seam between the slab and foundation wall

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Rigid foam wraps the exterior of the foundation slab.

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Slab-on-grade foundation and safe room.

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Seismic and Thermal Resistance in Slab-on-Grade Foundations with Turned-Down Footings (Monolithic Slabs)

Guide

Guide describing how to construct and retrofit homes built on slab-on-grade foundations in earthquake-prone areas to withstand seismic forces by properly installing wall-to-foundation connections.

High-Performance Slab-on-Grade Foundation Insulation Retrofits

Reference

Report assessing slab-on-grade foundation insulation energy savings.

A raised slab foundation elevates the level of the floor above grade

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Rigid Foam Insulation Installed over Existing Foundation Slabs

Guide

Guide describing how to insulate an existing slab floor by adding rigid foam insulation over the slab then installing a floating subfloor.

This raised-slab CMU and brick foundation includes flood-resistant features such as a sloped grade, capillary break under the slab (gravel or sand), vapor barrier under the slab (polyethylene sheet), and capillary break at the top of the foundation wall

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This raised-slab poured concrete foundation includes flood-resistant features such as a sloped grade, capillary break under the slab (gravel or sand), vapor retarder under the slab (rigid insulation), and capillary break at the top of the foundation wall

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

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Right – The seam between the slab and the foundation wall is sealed with urethane caulk.

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The home’s slab-on-grade foundation is wrapped in a blanket of rigid foam extending completely under the slab and along the edges.

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Raised-slab CMU foundation including flood-resistant features: sloped grade, damp proofed stem wall, capillary break under the slab (gravel or sand), vapor barrier under the slab and capillary break at the top of the foundation wall (polyethylene sheet)

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Externally insulated concrete slab-on-grade foundation with a turn-down footing, showing anchorage of the wall to the foundation for seismic resistance

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To help keep the monolithic slab-on-grade foundation dry, the site’s surfaces is graded away from the structure, the slab is poured on a bed of gravel, and using a vapor barrier will separate the foundation from the sill plates.

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Reinforce concrete slab and foundation walls to minimize future cracks that could let in pests

Concrete slab-on-grade foundation with a turn-down footing insulated on its top surface, showing anchorage of the wall to the foundation for seismic resistance

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Right - Additional potential locations for slab-on-grade insulation include (a) under the slab and outside the perimeter with optional underground moisture block, (b) under the whole foundation, or (c) on top of the slab.

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Externally insulated post-tensioned concrete slab-on-grade foundation wall with a turn-down footing showing anchorage of the wall to the foundation for seismic resistance

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Externally insulated post-tensioned concrete slab-on-grade foundation wall with a turn-down footing showing anchorage of the wall to the foundation for seismic resistance

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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.

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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ICF foundation walls wrap the floor slab in R-22 of insulation while the entire space under the slab is covered with 4.3 inches of closed-cell spray foam.

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Slab independent of foundation wall

Flood-Resistant Raised-Slab Foundations

Structural Foundation Slab | Madrona Passive House

Drainage techniques for slab-on-grade foundations

Exterior Edge Insulation for Existing Foundation Slabs

Caulk the seam between the slab and foundation wall

Rigid foam wraps the exterior of the foundation slab.

Slab-on-grade foundation and safe room.

Seismic and Thermal Resistance in Slab-on-Grade Foundations with Turned-Down Footings (Monolithic Slabs)

High-Performance Slab-on-Grade Foundation Insulation Retrofits

A raised slab foundation elevates the level of the floor above grade

Rigid Foam Insulation Installed over Existing Foundation Slabs

This raised-slab CMU and brick foundation includes flood-resistant features such as a sloped grade, capillary break under the slab (gravel or sand), vapor barrier under the slab (polyethylene sheet), and capillary break at the top of the foundation wall

This raised-slab poured concrete foundation includes flood-resistant features such as a sloped grade, capillary break under the slab (gravel or sand), vapor retarder under the slab (rigid insulation), and capillary break at the top of the foundation wall

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

Right – The seam between the slab and the foundation wall is sealed with urethane caulk.

The home’s slab-on-grade foundation is wrapped in a blanket of rigid foam extending completely under the slab and along the edges.

Raised-slab CMU foundation including flood-resistant features: sloped grade, damp proofed stem wall, capillary break under the slab (gravel or sand), vapor barrier under the slab and capillary break at the top of the foundation wall (polyethylene sheet)

Externally insulated concrete slab-on-grade foundation with a turn-down footing, showing anchorage of the wall to the foundation for seismic resistance

To help keep the monolithic slab-on-grade foundation dry, the site’s surfaces is graded away from the structure, the slab is poured on a bed of gravel, and using a vapor barrier will separate the foundation from the sill plates.

Reinforce concrete slab and foundation walls to minimize future cracks that could let in pests

Rigid foam extends under the full slab and lines the inside edges of the foundation walls.

Four inches of rigid foam separate the concrete slab from the ground and the foundation walls.

Concrete slab-on-grade foundation with a turn-down footing insulated on its top surface, showing anchorage of the wall to the foundation for seismic resistance

Right - Additional potential locations for slab-on-grade insulation include (a) under the slab and outside the perimeter with optional underground moisture block, (b) under the whole foundation, or (c) on top of the slab.

Externally insulated post-tensioned concrete slab-on-grade foundation wall with a turn-down footing showing anchorage of the wall to the foundation for seismic resistance

Externally insulated post-tensioned concrete slab-on-grade foundation wall with a turn-down footing showing anchorage of the wall to the foundation for seismic resistance

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

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

ICF foundation walls wrap the floor slab in R-22 of insulation while the entire space under the slab is covered with 4.3 inches of closed-cell spray foam.