This effect and other conditions that regulate frost penetration into the ground are illustrated in Figure 2. Heat input to the ground from buildings effectively raises the frost depth at the perimeter of the foundation. The frost protected shallow foundation technology recognizes the thermal interaction of building foundations with the ground. Recommended Construction Methods and Detailsĭetailed Method for Heated Buildings How FPSF Works History of frost-protected shallow foundationsįrost Action and Foundations (the nitty gritty on how frost heave works) The FPSF is considered standard practice for residential buildings in Scandinavia. The most extensive use has been in the Nordic countries, where over one million FPSF homes have been constructed successfully over the last 40 years. An FPSF incorporates strategically placed insulation to raise the frost depth around a building, thereby allowing foundation depths as shallow as 16 inches, even in the most severe climates. The 1995 edition of the Council of American Building Officials (CABO) One and Two-Family Dwelling Code includes simplified guidelines for building slab-on-grade homes with shallow foundations that are protected from frost by rigid foam insulation.Ī frost protected shallow foundation (FPSF) is a practical alternative to deeper, more-costly foundations in cold regions with seasonal ground freezing and the potential for frost heave.įind slab and foundation contractors near meįigure 1 shows an FPSF and a conventional foundation. There is an exception to this standard: many codes permit foundations to lie above the frost line as long as they're "protected from frost." However, approval depends on local code officials, and may require special engineering. The goal is to protect foundations from frost heaving. Most building codes in cold-climates require foundation footings be placed below the frost line, which can be about 4-feet deep in the northern United States. Frost-Protected Shallow Foundations (FPSF) What are Frost-Protected Shallow Footings and Why Are They Used?
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