Energy-Efficient Resource-Efficient Frost-Protected Shallow Foundations Energy-Efficient Resource-Efficient Frost-Protected Shallow Foundations - 3/1/2000 (PDF - 342kb) This 12-page guide published by NAHB provides an introduction to Frost-Protected Shallow Foundations (FPSFs). It explains what FPSFs are, how they work, the benefits involved, where they are approved, and much more. Use this guide to learn more about the code requirements and find out if FPSFs are right for you. | 
