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 IECC® 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
Building DevelopmentRequirements: Fenestration

Climate Zone

1

2

3

4 Except Marine

5 and Marine 4

6

7

8

Vertical Fenestration (40% maximum of above-grade wall)

U-Factor

Framing materials other than metal with or without metal reinforcement of cladding

U-Factor

1.2

0.75

0.65

0.4

0.35

0.35

0.35

0.35

Framing with or without thermal break

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

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)

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)
Building Envelope Requirements: Opaque Assemblies

Climate Zone

1

2

3

4 Except Marine

5 and Marine 4

6

7

8

Roofs

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

Mass

NR

R-5.7ci

R-7.6ci

R-9.5cic

R-11.4ci

R-13.3ci

R-15.2ci

R-25ci

Metal Buildingb

R-16

R-16

R-19

R-19

R-13 +
R-5.6ci

R-13 +
R-5.6ci

R-19 +
R-5.6ci

R-19 +
R-5.6ci

Metal Framed

R-13

R-13

R-13

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-7.5ci

Wood Framed and Other

R-13

R-13

R-13

R-13

R-13 +
R-3.8ci

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-15.6ci

Walls, Below Grade

Below Grade Wall

NR

NR

NR

NR

R-7.5ci

R-7.5ci

R-7.5ci

R-7.5ci

Floors

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-30e

Slab-on-Grade Floors

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
12in. below

R-7.5 for
12in. below

R-10 for
24in. below

R-15 for
24in. below

R-15 for
24in. below

R-15 for
24in. below

R-20 for
24in. below

R-20 for
24in. below

Opaque Doors

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)
Building Envelope Requirements: Opaque Assemblies "Group R"

Climate Zone

1

2

3

4 Except Marine

5 and Marine 4

6

7

8

Roofs

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

Mass

R-5.7ci

R-7.6ci

R-9.5ci

R-11.4cic

R-13.3ci

R-15.2ci

R-15.2ci

R-25ci

Metal Buildingb

R-16

R-16

R-19

R-19

R-13 +
R-5.6ci

R-13 +
R-5.6ci

R-19 +
R-5.6ci

R-19 +
R-5.6ci

Metal Framed

R-13

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-15.6ci

R-13 +
R-15.6ci

Wood Framed and Other

R-13

R-13

R-13

R-13 +
R-3.8ci

R-13 +
R-3.8ci

R-13 +
R-7.5ci

R-13 +
R-7.5ci

R-13 +
R-15.6ci

Walls, Below Grade

Below Grade Walld

NR

NR

NR

R-7.5ci

R-7.5ci

R-7.5ci

R-7.5ci

R-7.5ci

Floors

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-30e

R-30e

R-30

Slab-on-Grade Floors

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
12in. below

R-7.5 for
12in. below

R-10 for
24in. below

R-15 for
24in. below

R-15 for
24in. below

R-20 for
48in. below

R-20 for
48in. below

R-20 for
48in. below

Opaque Doors

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