0 Helpful?

In order to get R-15 in Zone 5 on a 60-year crawlspace concrete wall, can I run R-10 outside and R-6 inside?

Need help. The code says "continuous," but ICF walls are not.

Asked by Charles Nelson
Posted Jun 28, 2018 11:14 AM ET
Edited Jun 28, 2018 12:42 PM ET


3 Answers

Select your preferred way to display the comments and click "Save settings" to activate your changes.

R-10 outside and R-6 inside is fine with me. But you should talk to your local code inspector (if in fact a code inspector is involved with this project) -- because it's the local code enforcement authority that you have to convince, not me.

Answered by Martin Holladay
Posted Jun 28, 2018 12:34 PM ET


I'm not sure how ICF walls are not considered continuous- please explain!

Note: In zone 5 when more than half the insulation is on the exterior of a mass wall even R13 would meet code for above-grade walls. You might run that by the inspector as well.

Answered by Dana Dorsett
Posted Jun 28, 2018 1:45 PM ET


Charles, the intent of "continuous" in the code means no interruptions by studs or similar. Although the concrete obviously splits your two layers of insulation, each layer is continuous. At least that's my common-sense interpretation. Like Martin says, it's your AHJ who makes the call.

Answered by Michael Maines
Posted Jun 28, 2018 2:40 PM ET

Other Questions in Building Code Questions

How long for interior to dry out?

In General questions | Asked by Peter L | Jul 22, 18

Raised Floor Insulation and Foam Sheathed Walls

In Green building techniques | Asked by user-7124491 | Jul 22, 18

Insulation Retrofit

In General questions | Asked by user-7117614 | Jul 22, 18

Thoughts on negative pressure after balancing an Venmar X24ERV?

In Mechanicals | Asked by David Goodyear | Jul 20, 18

Looking for options: concrete pad detail

In General questions | Asked by tech1234 | Jul 22, 18
Register for a free account and join the conversation

Get a free account and join the conversation!
Become a GBA PRO!