ASHRAE R-Value Climate Zone Map

Climate Zones

Building codes require a structure to meet certain R-values to achieve a specific level of efficiency. The climate zone plays a big role in determining what the minimum R-value has to be for a specific region. Additionally, each state or local code body may be at differing levels of adoption of energy codes.

The chart below provides minimum above deck roof insulation R-value requirements for commercial buildings, residential buildings higher than three stories, and semi-conditioned buildings (warehouses, etc.).

Climate Zone Map
 

ZONE

ASHRAE 90.1 -
2004
(IECC 2006)

ASHRAE 90.1 -
2007
(IECC 2009)

ASHRAE 189.1 -
2009

ASHRAE 90.1 - 2010
(proposed)

IECC 2012

IGCC 2012

 

Zone 1

R-15

R-15

R-20

R-20

R-20

R-22.2

 

Zone 2

R-15

R-20

R-25

R-25

R-20

R-22.2

 

Zone 3

R-15

R-20

R-25

R-25

R-20

R-22.2

 

Zone 4

R-15

R-20

R-25

R-30

R-25

R-27.8

 

Zones 5 & 4 Marine

R-15

R-20

R-25

R-30

R-25

R-27.8

 

Zone 6

R-15

R-20

R-30

R-30

R-30

R-33.3

 

Zones 7 & 8

R-15/R-20

R-20

R-35

R-35

R-35

R-38.9

Breathe In The AtlasPHERE™
LEARN, SHARE, CONNECT

  • Social
  • News
VIEW MORE