vapor barrier under concrete floor?
We are getting ready to pour the concrete floor in our basement, and then we will do the garage floor. We have decided to do 2 inch rigid insulation under the cement in the basement floor and are wondering if we should also do a vapor barrier?
In terms of the garage floor, we are laying down the 2 inch rigid insulation around the perimeter of the garage floor, with just the gravel in the centre of the garage. The insulation is rather costly and the garage will not be heated (hence only putting it in the perimeter). However, we also wondered if we need a vapor barrier under the garage floor?
I am getting conflicting info on the necessity of a vapor barrier so I would appreciate hearing what others who live in a heat dominated climate have done under their garage and basement concrete floors. BTW, I live in southern Ontario so it is not that cold (sort of like a Niagara Falls NY).