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Table 2. Opaque Wall U-Values (Uw) for Attached and Multi-Family Buildings (excerpted from ICC 2003)

Heating Degree Days Base 65 (HDD65) From Nearest Location

  • >

    9,000

7,100–8,999 3,000–7,099 2,800–2,999 2,600–2,799 < 2,600

U w A i r t o A i r , I n c l u d e s F r a m i n g ( B t u / h · f t 2 · ° F )

0.064 0.076 0.085 0.100 0.120 0.140

7,000

0.36

0.32

6,000–6,999

0.39

0.32

5,000–5,999

0.46

0.58

4,000–4,999

0.53

0.58

3,000–3,999

0.58

0.58

2,000–2,999

0.62

0.65

1,000–1,999

0.79

0.65

999

1.00

0.79

Table 3. Vertical Fenestration U-Values (UF) and SHGC

HDD65 From Nearest Location Based on TMY3 Data*

  • *

    Summary statistics for typical meteorological year (TMY3) sites can be found in the BA Analysis

Spreadsheet (http://www1.eere.energy.gov/buildings/building_america/perf_analysis.html)

UF Air to Air,

SHGC,

( ) u Bt /h·ft2·°F Includes Framing and Sash

Includes Framing

and Sash

  • o

    U-value of an insulated floor above a vented crawl space or other unconditioned space shall be as specified in Figure 1 (excerpted from ICC 2003). The ventilation rate shall be the same in the Benchmark as the Prototype, regardless of whether the ventilation is natural or fan induced.

    • o

      U-value of insulated walls in an unvented crawl space shall be as specified in Figure 2 (excerpted from ICC 2003). This U-value represents the combined effect of wall components and the surface air film, but it does not include adjacent soil.

    • o

      U-value of insulated basement walls shall be as specified in Figure 3 (excerpted from ICC 2003), and the insulation shall be located on the interior surface of the walls. This U-value represents the basement wall assembly, including the surface air film, but it does not include ground effects.

    • o

      R-value and depth of slab edge insulation for slab-on-grade construction shall be as specified in Figure 4 (excerpted from ICC 2003). This R-value is for rigid foam insulation and does not include the slab itself or ground effects.

    • o

      U-value of insulated roof/ceiling shall be as specified in Figure 5 (excerpted from ICC 2003), except for cathedral ceilings which shall have a U-value of 0.036 in all locations with more than 2500 heating degree-days. If the Prototype includes an attic, the Benchmark shall have an unconditioned attic with insulation at the attic floor.

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