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U0 (Btu/h-sqft-ºF)

R-Value (h-sqft-ºF/Btu)

Heating Degree Days (HDD)

Maximum U0-Factor

0 - 1,499 1,500 - 4,500 4,501 - 8,500 8,501 - 9,000 > 9,000

None Required 0.205 - (HDD x 0.0000233) 0.11125 - (HDD x 0.0000025) 0.6 - (HDD x 0.00006) 0.06

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

  • 0

    1

2

3

4

5

15

16

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20

6

7 8 9 10 11 12 13

Annual Heating Degree Days, Base 65

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Figure 3. Basement wall U-value (excerpted from ICC 2003)

Heating Degree Days (HDD)

Heated Slab

0 - 499 500 - 4,500 4,501 - 19,000 > 19,000

Unheated Slab

0 - 2,499 2,500 - 4,500 4,501 - 19,500 > 19,500

20

18

16

14

12

10

8

6

4

Heated Slab

Unheated Slab

Minimum R-Value

None Required R-6 2.5862 + (HDD x 0.000759) R-17

None Required R-4 1.0 + (HDD x 0.000666) R-14

2

2 ft

4 ft

0

0

1

2

3

4

5

6 7 8 9 10 11 12 13 14

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Annual Heating Degree Days, Base 65 (In Thousands)

Figure 4. Slab insulation R-value and depth (excerpted from ICC 2003)

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