Originally Posted by plastic
I have already encapsulated the crawl space with a 12 mill vapor barrier and also used spray foam in the wall cavities.
but the house wood floors is still feel cold.
We removed the old fiber glass insulation and have not installed anything else yet.
I'd like to put roxul R23, which is 5 1/2" thick.
I live in Maryland and I like to know if I need a vapor barrier in between the floor joists before installing roxul.
Is this a good way to go.
I am doing a similar project also wanting to use Roxul and some very helpful folks have guided me. What kinda of crawl space is it? Do you know if it's vented (unconditioned) or unvented? I think you'll be ok without a vapor barrier as the plywood floor sitting on the joist acts a vapor retarder plus the roxul resists moisture. But that all depends on your setup!
Few other things to check since the floors still feel cold that I am in the process of doing in my home. Check the rim joists, mine were lightly stuffed with smashed up fiberglass. I can't tell you how much air they were letting in. I just sealed with a good sealant and cut to fit foam board (XPS) sealed in place with great stuff foam. Also seal the sill ledge, I had a quarter inch gap in some spots I checked where I can see outside. As you can imagine the air was just gushing in. Also seal up some holes for cable lines, electric, etc... if you have any running down there.