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U0 (Btu/h-sqft-ºF)

Heating Degree Days (HDD)

Maximum U0-Factor

0 - 1,000 1,001 - 2,500 2,501 - 15,500 15,501 - 16,500 > 16,500

0.08 0.07 0.05 0.05 - [(HDD - 15,500) x 0.00001] 0.04

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

0

1

2

3

4

5

6

17

18

Figure 1. U-value of floor over unconditioned space (excerpted from ICC 2003)

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20

21

16

7 8 9 10 11 12 13 14 Annual Heating Degree Days, Base 65

15

U0 (Btu/h-sqft-ºF)

Heating Degree Days

Maximum U0-Factor

(HDD)

0 - 499

None Required

500 - 2,000

0.15

2,001 - 5,000

0.21 - (HDD x 0.00003)

> 5,000

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

Figure 2. Crawl space wall U-value (excerpted from ICC 2003)

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18

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20

6

7 8 9 10 11 12 13

Annual Heating Degree Days, Base 65

14

6

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