Vapor Retarder in crawlspace

[retire09]

Is a vapor retarder required between the floor joists and behind the rim board in a heated crawlspace?

The foundation walls are concrete and a vapor retarder is covering the gound in the crawlspace.

The floor above is not insulated and the crawlspace is not vented.

 

[fatboy]

No, as long as you meet the requirements of R408.3, which it appears maybe you do with #2.2, vapor barrier and conditioned air, do you meet the rest of the requirement?

 

[retire09]

Yes, I would say they meet the requirements of 2.2

 

[fatboy]

Then they are good to go......and so are you.

 

[lunatick]

What part of the country is the project in.

You may need it to address Radon Gas concerns. Not just energy. Not just subgrade moisture.