Climate Zone Requirements

The national requirement for thermal insulation varies depending on the climate you live in. The warmer the climate you live in the lower the requirements for thermal insulation. The colder the climate the greater the requirements are for thermal insulation. Each wall type, floor type, and ceiling type has a different requirement and each building department has adopted a custom version of the requirements. The following chart represents commonly used wall and ceiling assemblies with R value requirements and where the R value should be installed. This chart does not represent all the options and configurations available in your local market. For a complete 2009 IECC analysis of your home call or email one of our professionals. 

Exterior Wall Assemblies Zone 4 Zone 5 Zone 6 Zone 7 & 8
Wood Framed (All) 13 20 20 21
Concrete wood furred - Interior side 8 10 9 11
Concrete wood furred - Exterior side 5 7 10 10
Crawlspace wall - Interior side 5 8 8 13
Crawlspace wall - Exterior side 5 5 5 10
Other Assemblies Zone 4 Zone 5 Zone 6 Zone 7 & 8
Under Slab 10 - 2' from perimeter 10 - 2' from perimeter 10 - 4' from perimeter 10 - total area
Under Heated Slab 15 - 2' from perimeter 15 - 2' from perimeter 15 - 4' from perimeter 15 - total area
Ceiling Insulation 38 38 49 49
Garage Ceiling wiht Living Above 19 30 30 38
Floor over crawlspace 19 30 30 38
Interior floors 19 19 19 19