Page 241 - Masonry and Concrete

Footings, Foundation Walls, Basements, and Slabs
240 CHAPTER SIX

walls. Below this level, the cumulative thermal resistance of the soil is
sufficient to prevent serious heat loss.

6.8 Frost-Protected Shallow Foundations

Deep foundations required to reach below the frost line add cost to the
construction of homes. Some codes, including the CABO One and Two
Family Dwelling Code allow the construction of shallow slab-on-grade
foundations for heated buildings in cold climates if certain precau-
tions are taken to protect against frost heave. This type of foundation
design is sometimes referred to as frost-protected shallow foundations,
insulated footings, or frost-protected footings and was first developed
in Scandinavia.
A layer of polystyrene insulation applied to the vertical stem of the
foundation wall, and a horizontal “wing” of insulation placed outside

HEAT FLOW PATH

FIGURE 6-44
Heat loss at foundation perimeter. (from Donald Watson and Kenneth Labs, Climatic
Building Design, McGraw-Hill, 1983).

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