2012 Commercial Energy Efficiency

Source: IECC 2012 Table C402.2
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-20ci

R-20ci

R-20ci

R-25ci

R-25ci

R-30ci

R-35ci

R-35ci

Metal Buildings (with R-5 thermal blocks)a,b

R-19+R-11 LS

R-19+R-11 LS

R-19+R-11 LS

R-19+R-11 LS

R-19+R-11 LS

R-25+R-11 LS

R-30+R-11 LS

R-30+R-11 LS

Attic and Other

R-38

R-38

R-38

R-38

R-38

R-49

R-49

R-49

Walls, Above Grade

Mass

R-5.7ci

R-5.7ci

R-7.6ci

R-9.5ci

R-11.4ci

R-13.3ci

R-15.2ci

R-25ci

Metal Buildingb

R-13+R-6.5ci

R-13+R-6.5ci

R-13+R-6.5ci

R-13+R-13ci

R-13 +
R-13ci

R-13 +
R-13ci

R-13 +
R-13ci

R-13 +
R-19.5ci

Metal Framed

R-13+R-5ci

R-13 +
R-5ci

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-7.5ci

Wood Framed and Other

R-13+R-3.8ci or R-20

R-13+R-3.8ci or R-20

R-13+R-3.8ci or R-20

R-13+R-3.8ci or R-20

R-13 +
R-3.8ci or R-20

R-13 +
R-7.5ci or R-20+R-3.8ci

R-13 +
R-7.5ci or R-20+R-3.8ci

R-13 +
R-15.6ci or R-20+R-10ci

Walls, Below Grade

Below Grade Walld

NR

NR

NR

R-7.5ci

R-7.5ci

R-7.5ci

R-10ci

R-10ci

Floors

Mass

NR

R-6.3ci

R-10ci

R-10ci

R-10ci

R-12.5ci

R-15ci

R-15ci

Joist/Framing

NR

R-30

R-30

R-30

R-30

R-30

R-30e

R-30e

Slab-on-Grade Floors

Unheated Slabs

NR

NR

NR

R-10 for 24in. below

R-10 for 24in. below

R-10 for 24in. below

R-15 for 24in. below

R-15 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
36in. below

R-15 for
48in. below

R-20 for
24in. below

R-20 for
48in. below

Opaque Doors

Swinging

U-0.61

U-0.61

U-0.61

U-0.61

U-0.37

U-0.37

U-0.37

U-0.37

Roll-up or Sliding

R-4.75

U-4.75

U-4.75

U-4.75

U-4.75

U-4.75

U-4.75

U-4.75


Source: IECC 2012 Table C402.2
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-25ci

R-25ci

R-30ci

R-35ci

R-35ci

Metal Buildings (with R-5 thermal blocks)a,b

R-19+R-11 LS

R-19+R-11 LS

R-19+R-11 LS

R-19+R-11 LS

R-19+R-11 LS

R-25+R-11 LS

R-30+R-11 LS

R-30+R-11 LS

Attic and Other

R-38

R-38

R-38

R-38

R-49

R-49

R-49

R-49

Walls, Above Grade

Mass

R-5.7ci

R-7.6ci

R-9.5ci

R-11.4ci

R-13.3ci

R-15.2ci

R-15.2ci

R-25ci

Metal Buildingb

R-13+R-6.5ci

R-13+R-13ci

R-13+R-13ci

R-13+R-13ci

R-13 +
R-13ci

R-13 +
R-13ci

R-13 +
R-19.5ci

R-13 +
R-19.5ci

Metal Framed

R-13+R-5ci

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-17.5ci

Wood Framed and Other

R-13+R-3.8ci or R-20

R-13+R-3.8ci or R-20

R-13+R-3.8ci or R-20

R-13+R-3.8ci or R-20

R-13 +
R-7.5ci or R-20+R3.8

R-13 +
R-7.5ci or R-20+R3.8

R-13 +
R-7.5ci or R-20+R3.8

R-13 +
R-15.6ci or R-20+R-10ci

Walls, Below Grade

Below Grade Walld

NR

NR

NR

R-7.5ci

R-7.5ci

R-7.5ci

R-10ci

R-12.5ci

Floors

Mass

NR

R-8.3ci

R-10ci

R-10.4ci

R-12.5ci

R-12.5ci

R-16.7ci

R-16.7ci

Joist/Framing

NR

R-30

R-30

R-30

R-30

R-30e

R-30e

R-30e

Slab-on-Grade Floors

Unheated Slabs

NR

NR

NR

R-10 for 24in. below

R-10 for 24in. below

R-15 for 24in. below

R-15 for 24in. below

R-20 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
36in. below

R-20 for
48in. below

R-20 for
48in. below

R-20 for
48in. below

Opaque Doors

Swinging

U-0.61

U-0.61

U-0.61

U-0.61

U-0.37

U-0.37

U-0.37

U-0.37

Roll-up or Sliding

R-4.75

U-4.75

U-4.75

U-4.75

U-4.75

U-4.75

U-4.75

U-4.75

For SI: 1 inch=25.4mm. ci=Continuous insulation. NR=No requirement.

LS=Linear System - A continuous membrane installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins.

  • a. Assembly descriptions can be found in ANSI/ASHRAE/IESNA Appendix A.
  • b. Where using R-value compliance method, a thermal spacer block shall be provided, otherwise use the U-factor compliance method in Table C402.1.2.
  • c. R-5.7ci is allowed to be substituted with concrete block walls complying with ASTM C 90, ungrouted or partially grouted at 32 inches or less on center vertically and 48 inches or less on center horizontally, with ungrouted cores filled with materials having a maximum thermal conductivity of 0.44 Btu-in/h-f2 °F.
  • d. Where heated slabs are below grade, below-grade walls shall comply with the exterior insulation requirements for heated slabs.
  • e. Steel floor joist systems shall be insulated to R-38.

Source: IECC 2012 Table C402.3
Building Envelope Requirements: Fenestration

Climate Zone

1

2

3

4 Except Marine

5 and Marine 4

6

7

8

Vertical Fenestration

U-factor

Fixed fenestration

0.50

0.50

0.46

0.38

0.38

0.36

0.29

0.29

Operable fenestration

0.65

0.65

0.60

0.45

0.45

0.43

0.37

0.37

Entrance doors

1.10

0.83

0.77

0.77

0.77

0.77

0.77

0.77

SHGC

SHGC

0.25

0.25

0.25

0.40

0.40

0.40

0.45

0.45

Skylights

U-factor

0.75

0.65

0.55

0.50

0.50

0.50

0.50

0.50

SHGC

0.35

0.35

0.35

0.40

0.40

0.40

NR

NR