Basement – How to insulate interior basement walls that are not against the exterior walls

basementinsulation

I'm in the process of building an office and family room in my basement and need some help with the walls and insulation.

There is a perimeter drain in the slab around the exterior walls that collects a small amount of water that weeps through the walls during the wet season. This perimeter drain will require me to place the studs about 4" from the wall.

In this scenario, with an airgap between the interior/exterior wall, should I use rigid foam insulation attached to the block wall, or traditional fiberglass insulation within the studs? Also, if fiberglass is used, should I include a vapor-barrier and on which side of the wall should it be placed?

Best Answer

I think based on the comments I better understand your scenario now.

Building Science has a lot of great information on basement insulation and the suggested method is to use XPS foam against the walls, optionally bats between the studs and no vapor barrier (since the XPS foam is the vapor barrier).

I would suggest that you use 1 1/2 - 2" XPS foam against the walls, and then space your studs another inch or so away from the wall (to allow your water to drain). If you need higher R values then the XPS provides you can use bats between the studs and I would suggest something like Roxul insulation which is stone wool instead of fiberglass since it is not affected by moisture like fiberglass is.

It would also be advisable to use steel studs so that they don't rot should they come in contact with moisture. You might also opt to put the bottom plate on top of a piece of XPS foam so that there is a less likelihood of the metal studs rusting.