Understanding Frost-Protected Shallow Foundations (FPSF): Winter Maintenance Tips

A frost-protected shallow foundation (FPSF) is a type of foundation system designed to prevent frost heave in colder climates without requiring deep excavation. Instead of extending the foundation below the frost line, this system uses strategically placed rigid foam insulation to retain ground heat and prevent freezing temperatures from affecting the soil under the foundation.

Because FPSFs rely on stable soil temperatures, homeowners must maintain a minimum interior temperature (typically around 64°F or as specified in local code) during the winter months to ensure proper thermal performance. Letting the interior of the home get too cold can compromise the insulation’s ability to prevent frost penetration.

To protect your FPSF, follow these essential maintenance steps:

• Keep downspouts extended away from the home so water doesn’t pool near the foundation, which can freeze and cause frost heave.

• Ensure proper grading and drainage around the home to prevent standing water or ice buildup near the foundation.

• Inspect the exterior foam insulation regularly and repair any damage caused by animals, lawn equipment, or UV exposure. Exposed or compromised insulation reduces the foundation’s ability to resist frost.

By maintaining the proper temperature inside your home and ensuring good drainage and insulation condition, you’ll help protect the integrity and performance of your frost-protected shallow foundation for years to come.

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