My unfinished basement has a 87" ceiling height right now. I don't know I should use 1", 1.5" or 2" XPS foam on the floor? The whole basement floor plan will be 6mil poly + XPS foam + 23/32" T&G plywood + engineered wood floor.
Personal preference, how tall are the people who live there?
Can I ask the purpose of the poly? If your basement floor is allowing water up from beneath then you're likely going to have issues no matter what you do (IMHO).
I use ship-lapped, rigid foam insulation and use 2" on the walls and 1" on the floor. Glue to the walls & floor with the correcct adhesive and each seam should be tuck-taped, and spray foam used to fill any gaps around the edges. All rigid foam insulation is mould and mildew resistant and won't hold moisture, even if you have a flood in your basement. You can use mould-resistant drywall as well.
The goal of insulating in this manner is creating a thermal break between the air inside your basement and the air outside. It will eliminate any air movement behind the walls that could lead to condensation.
Can I ask the purpose of the poly? If your basement floor is allowing water up from beneath then you're likely going to have issues no matter what you do (IMHO).
Mold only grows on organic materials, concrete, poly, foam, etc. etc. none of them support the growth of mold.
If your basement floods, having gimmicky drywall wont make a difference.
If you need an interior weeping system, then you probably should have a gap as well. Something like dimpled plastic under the insulation, or skip the insulation and put in DRIcore. Insulation on the floor has little payback.
http://www.dricore.com/en/eIndex.aspx
Insulation on the floor has little payback.
I'm really getting fed up with all of the mis-information going on here...
My unfinished basement has a 87" ceiling height right now. I don't know I should use 1", 1.5" or 2" XPS foam on the floor? The whole basement floor plan will be 6mil poly + XPS foam + 23/32" T&G plywood + engineered wood floor.
PFFT! We are talking about a basement below grade were the temps are nothing like a room over the garage. Try some
ROLAIDS®.
This is awkward, but...
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