Insulating floor

[builderboy]

I'm looking at insulating my floor which will vary from 1 to 4 ft above ground. A previous topic suggested covering the bottom with tyvek, pegboard or osb/plywood with vent holes drilled. I'v got a chance to get a bunch of vinyl soffit free. It provides the venting and won't wick moisture like masonite pegboard. Since it's free it's my cheapest option. I'll only need to buy about 20% of my requirement. Any bad consequences here?

[jraabe]

That would be a sturdy material that will not trap moisture. Be sure the insulation fully fills the joist cavity and the soffit material holds it up against the subfloor.

Good find!

[Chateau_Prideaux]

Assuming that you're using batts, which way should the insulation's backing face? Do you need to install this before laying down the subfloor decking?

[builderboy]

Vapor barrier to the warm side of the bats ie between bats and floor decking. I'm doing it from above before installing the decking because I have little room to work underneath. The trick is keeping the bats dry until the building is weather tight. Got my tarps ready for rain!!