Page 245 - Masonry and Concrete

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

FLASHING HORIZONTAL
CAP INSULATION
PROTECTIVE
COVERING

12" MAX. FOUNDATION
PERIMETER
12" MIN. PLAN

C
4" THICK
GRANULAR BASE B A C

1
Minimum insulation requirements for frost-protected footings in heated buildings
Air Freezing Vertical Horizontal Insulation Horizontal Insulation Dimensions
3,5
Index Insulation R-Value Inches
(°F Days) 2 R-Value 3,4 along walls at corners A B C
1,500 4.5 Not Not Not Not Not
or less Required Required Required Required Required
2,000 5.6 Not Not Not Not Not
Required Required Required Required Required
2,500 6.7 1.7 4.9 12 24 40
3,000 7.8 6.5 8.6 12 24 40
3,500 9.0 8.0 11.2 24 30 60
4,000 10.0 10.5 13.1 24 36 60
NOTES: 1. Insulation requirements are for protection against frost damage in heated buildings. Greater val-
ues may be required to meet energy conservation standards. Interpolation between values is
permitted.
2. See Figure 6-47 for Air-Freezing Index values.
3. Insulation materials shall provide the stated minimum R-values under long-term exposure to
moist, below-ground conditions in freezing climates. The following R-values shall be used to
determine insulation thickness required for this application: Type II expanded polystyrene 2.4 R
per inch; Type IV extruded polystyrene 4.5 R per inch; Type VI extruded polystyrene 4.5 R per
inch; Type IX expanded polystyrene 3.2 R per inch; Type X extruded polystyrene 4.5 R per inch.
4. Vertical insulation shall be expanded polystyrene insulation or extruded polystyrene insulation,
and the exposed portions shall have a rigid, opaque and weather-resistant protective covering to
prevent the degradation of thermal performance. Protective covering shall cover the exposed por-
tion of the insulation and extend to a minimum of 6 in. below grade.
5. Horizontal insulation shall be extruded polystyrene insulation.
FIGURE 6-48
1
Minimum insulation requirements for frost-protected footings in heated buildings (from Council of American
Building Officials One and Two-Family Dwelling Code,, Falls Church, VA).

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