2009 Commercial Energy Efficiency
For commercial buildings and residential buildings over three stories in height the building must comply with the energy efficiency requirements set forth in Chapter 5 of the 2009 IECCÂ® or ASHRAE/IESNA 90.1. The 2006 version of the IECC diferentiated between Glass and Plastic skylights while the 2009 version does not. The tables below summarizes the prescriptive paths in a chart form.
Source: IECC 2009 Table 502.3 |
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Climate Zone |
1 |
2 |
3 |
4 Except Marine |
5 and Marine 4 |
6 |
7 |
8 |
Vertical Fenestration (40% maximum of above-grade wall) |
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U-Factor |
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Framing materials other than metal with or without metal reinforcement of cladding |
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U-Factor |
1.2 |
0.75 |
0.65 |
0.4 |
0.35 |
0.35 |
0.35 |
0.35 |
Framing with or without thermal break |
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Curtain Wall/Storefront U-Factor |
1 |
0.7 |
0.6 |
0.5 |
0.45 |
0.45 |
0.4 |
0.4 |
Entrance Door U-Factor |
1.2 |
1.1 |
0.9 |
0.85 |
0.8 |
0.8 |
0.8 |
0.8 |
All other U-Factor |
1.2 |
0.75 |
0.65 |
0.55 |
0.55 |
0.55 |
0.45 |
0.45 |
SHGC-All Frame Types |
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SHGC: PF < 0.25 |
0.25 |
0.25 |
0.25 |
0.4 |
0.4 |
0.4 |
0.45 |
0.45 |
SHGC: 0.25 < PF < 0.5 |
0.33 |
0.33 |
0.33 |
NR |
NR |
NR |
NR |
NR |
SHGC > 0.5 |
0.4 |
0.4 |
0.4 |
NR |
NR |
NR |
NR |
NR |
Skylights (3% Maximum) |
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U-Factor |
0.75 |
0.75 |
0.65 |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
SHGC |
0.35 |
0.35 |
0.35 |
0.4 |
0.4 |
0.4 |
NR |
NR |
a. All others includes operable windows, fixed windows and nonentrance doors.
Source: IECC 2009 Table 502.2(1) |
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Climate Zone |
1 |
2 |
3 |
4 Except Marine |
5 and Marine 4 |
6 |
7 |
8 |
Roofs |
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Insulation entirely above deck |
R-15ci |
R-20ci |
R-20ci |
R-20ci |
R-20ci |
R-20ci |
R-25ci |
R-25ci |
Metal Buildings (with R-5 thermal blocks)^{a,b} |
R-19 |
R-13+R-13 |
R-13+R-13 |
R-13+R-13 |
R-13+R-13 |
R-13+R-19 |
R-13+R-19 |
R-11+R-19 |
Attic and Other |
R-30 |
R-38 |
R-38 |
R-38 |
R-38 |
R-38 |
R-38 |
R-49 |
Walls, Above Grade |
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Mass |
NR |
R-5.7ci |
R-7.6ci |
R-9.5ci^{c} |
R-11.4ci |
R-13.3ci |
R-15.2ci |
R-25ci |
Metal Building^{b} |
R-16 |
R-16 |
R-19 |
R-19 |
R-13 + |
R-13 + |
R-19 + |
R-19 + |
Metal Framed |
R-13 |
R-13 |
R-13 |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
Wood Framed and Other |
R-13 |
R-13 |
R-13 |
R-13 |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
Walls, Below Grade |
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Below Grade Wall |
NR |
NR |
NR^{} |
NR^{} |
R-7.5ci |
R-7.5ci |
R-7.5ci |
R-7.5ci |
Floors |
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Mass |
NR |
R-6.3ci |
R-6.3ci |
R-10ci |
R-10ci |
R-12.5ci |
R-15ci |
R-15ci |
Joist/Framing |
NR |
R-19 |
R-19 |
R-19 |
R-19 |
R-30 |
R-30 |
R-30^{e} |
Slab-on-Grade Floors |
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Unheated Slabs |
NR |
NR |
NR |
NR |
NR |
R-10 for 24in. |
R-10 for 24in. |
R-10 for 24in. |
Heated Slabs |
R-7.5 for |
R-7.5 for |
R-10 for |
R-15 for |
R-15 for |
R-15 for |
R-20 for |
R-20 for |
Opaque Doors |
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Swinging |
U-0.7 |
U-0.7 |
U-0.7 |
U-0.7 |
U-0.7 |
U-0.7 |
U-0.5 |
U-0.5 |
Roll-up or Sliding |
U-1.45 |
U-1.45 |
U-1.45 |
U-0.5 |
U-0.5 |
U-0.5 |
U-0.5 |
U-0.5 |
- a. When using R-value compliance method, a thermal spacer block is required, otherwise use the U-factor compliance method. [see Tables 502.1.2 and 502.2(2)]
- b. Assembly descriptions can be found in Table 502.2(2)
- c. R-5.7ci is allowed to be substituted with concrete block walls complying with ASTM C90, ungrouted or partially grouted at 32 inches or less on center vertically and 48 inches or less on center horizontally, with ungrouted cores
- d. When heated slabs are placed below grade, below-grade walls must meet the exterior insulation requirements for perimeter insulation according to the heated slab-on-grade construction
- e. Steel floor joist systems shall to be R-38
Source: IECC 2009 Table 502.2(1) |
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Climate Zone |
1 |
2 |
3 |
4 Except Marine |
5 and Marine 4 |
6 |
7 |
8 |
Roofs |
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Insulation entirely above deck |
R-20ci |
R-20ci |
R-20ci |
R-20ci |
R-20ci |
R-20ci |
R-25ci |
R-25ci |
Metal Buildings (with R-5 thermal blocks)^{a,b} |
R-19 |
R-13+R-13 |
R-19 |
R-19 |
R-19 |
R-19 |
R-19+R-10 |
R-19+R-10 |
Attic and Other |
R-38 |
R-38 |
R-38 |
R-38 |
R-38 |
R-38 |
R-38 |
R-49 |
Walls, Above Grade |
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Mass |
R-5.7ci |
R-7.6ci |
R-9.5ci |
R-11.4ci^{c} |
R-13.3ci |
R-15.2ci |
R-15.2ci |
R-25ci |
Metal Building^{b} |
R-16 |
R-16 |
R-19 |
R-19 |
R-13 + |
R-13 + |
R-19 + |
R-19 + |
Metal Framed |
R-13 |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
Wood Framed and Other |
R-13 |
R-13 |
R-13 |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
R-13 + |
Walls, Below Grade |
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Below Grade Wall^{d} |
NR |
NR |
NR^{} |
R-7.5ci^{} |
R-7.5ci |
R-7.5ci |
R-7.5ci |
R-7.5ci |
Floors |
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Mass |
NR |
R-8.3ci |
R-8.3ci |
R-10ci |
R-12.5ci |
R-14.6ci |
R-16.7ci |
R-16.7ci |
Joist/Framing |
NR |
R-30 |
R-30 |
R-30 |
R-30 |
R-30^{e} |
R-30^{e} |
R-30 |
Slab-on-Grade Floors |
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Unheated Slabs |
NR |
NR |
NR |
NR |
R-10 for 24in. below |
R-10 for 24in. below |
R-10 for 24in. below |
R-10 for 24in. below |
Heated Slabs |
R-7.5 for |
R-7.5 for |
R-10 for |
R-15 for |
R-15 for |
R-20 for |
R-20 for |
R-20 for |
Opaque Doors |
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Swinging |
U-0.7 |
U-0.7 |
U-0.7 |
U-0.7 |
U-0.7 |
U-0.5 |
U-0.5 |
U-0.5 |
Roll-up or Sliding |
U-1.45 |
U-1.45 |
U-1.45 |
U-0.5 |
U-0.5 |
U-0.5 |
U-0.5 |
U-0.5 |
- a. When using R-value compliance method, a thermal spacer block is required, otherwise the U-factor compliance method [see Tables 502.1.2 and 502.2(2)]
- b. Assembly descriptions can be found in Table 502.2(2)
- c. R-5.7ci is allowed to be substituted with concrete block walls complying with ASTM C90, ungrouted or partially grouted at 32 inches or less on center vertically and 48 inches or less on center horizontally, with ungrouted cores
- d. When heated slabs are placed below grade, below-grade walls must meet the exterior insulation requirements for perimeter insulation according to the heated slab-on-grade construction
- e. Steel floor joist systems shall to be R-38