08:55AM | 10/18/05
Member Since: 10/17/05
1 lifetime posts
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


02:56PM | 10/18/05
Member Since: 04/25/05
1915 lifetime posts
The use of styrofoam insulation against a concrete wall is a great insulation system.

You don't need any extra vapor retarder with it, the foam is all that is needed.

For insulation the rim joist (band joist) I would cut the foam to fit and then seal it on all edges with Great Stuff canned foam.

The problem with using FG insulation is that that it is very hard to get a good seal on a vapor retarder and moist warm interior air can get behind it and them condense on the cold wood.

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