Im in the process of re-finishing my basement with a 2" slotted styrofoam (R-10)strapped with 1x3's. Is it necessary to place a vapour barrier on top or in back of the insulation or is it necessary to place any material directly against the concrete wall prior to placing the slotted sheets up?
Second question...With what do I insulate inbetween my joists at the top of the basement wall. Currently I have a fibreglass insulation that comes halfway down my walls but I am removing this to gain more room. Should I just remove the existing insulation to the bottom of the joist and leave the fibreglass there and vapour barrier it to the styrofoam I will be putting against the wall?
I will be finishing with a suspended ceiling and the frost depth is about 4' where I live
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