Hi, we live in Canada, my wife, which is from south America, has owned a house that has a fully nicely finished 2 bedroom basement that has no insulation. The basement was finished a few years ago by some people who didnt bother or didnt know that insulation was needed. The only thing that is between the foundation wall and the sheetrock, is a vapor barrier and a one inch thick board. Absolutely no room for blown in insulation. We must insulate the perimeter of the foundation. I notice that the new houses around here must have the perimeter of the foundation insulated with a 2 inch thick blue Styrofoam. I was thinking digging the perimeter to the bottom of the foundation, and put 2 layers of the same type of Styrofoam to insulate the foundation. I would like to know what they use to fix and seal the Styrofoam to the foundation.