Continuous insulation is an excellent addition to foundations. By isolating the foundation from the ground, foam plastic insulating sheathing limits thermal bridging and improves building performance, both from an energy standpoint as well as moisture management. All of this means greater building efficiency and occupant comfort.

For additional information about this topic visit Foundation Insulation & Frost Protection.
Tools & Education
Description

This gives an overview of value-added application of rigid foam sheathing to basement walls. 

Description

This standard is a code referenced guide for designing and constructing cost-effective and energy-efficient foundations using foam plastic sheathing. 

Description

Code-compliant details for the use of foam sheathing as thermal insulation in light frame construction. Available as a sealed code compliance report.

Description

This guide produced for the U.S. Dept. of Housing and Urban Development initiated modern recognition of frost-protected shallow foundations in the U.S. – ultimately resulting in building code acceptance and development of the ASCE 32 standard.

Description

To assist U.S. home builders, remodelers and trade contractors in the design, construction, and code approval of frost protected shallow foundations. This is an updated and more user friendly version of the HUD guide above.

Best Practices
New

This guide introduces some best practices for insulating foundations with FPIS properly installed as continuous insulation (ci). It provides details for basement walls, conditioned crawl space walls, slab-on-grade, and frost-protected shallow foundations.

New

Designed to be used in conjunction with the illustrative Foundation Insulation Fundamentals Quick Guide, this new addition to the library focuses on the proper specification of FPIS foundation insulation R-values for energy code compliance. This Guide is based on the 2024 IECC (and IRC Chapter 11) and addresses code-compliant foundation insulation R-value specification for all commercial buildings, residential Group R buildings, and  one- and two-family homes.

Provides information and construction details concerning thermal protection, subdrainage, waterproofing, vapor controls, structural requirements, radon control, and termite damage prevention when constructing or renovating residential or small commercial projects. 

What’s the best way to insulate a slab-on-grade foundation?

Additional Information

Comprehensive guide from the U.S. Department of Housing and Urban Development on “durability” in construction, or the ability of a material, system, or building to maintain its intended function for its intended life-expectancy with intended levels of maintenance in intended conditions of use.