Hi, I live in Hamilton Ont. I got a bunch of R-22 Batts of insulation from a friend, enough to insulate my basement walls.
My issue is this: as far as vapour barrier goes on concrete side of wall and finishing. Some people say (tar paper (15lb felt) or TYVEK, inch gap, stud wall,R22 insulation, 6mm vapour barrier) and others say (1" XPS rigid insulation, glue to foundation wall, inch gap, studded wall, R22 insulation, no vapour barrier needed because of 1" Rigid Insulation on concrete wall).
Which way is the right way to go since I have all this R22 batt insulation? I have read that Tar paper (felt) and TYVEK get mould after some years which is scary. Which way is best way to go?
This is the way I've done it for 30 years in Winnipeg (where we have real winters) and have never had a call back. Ever! I also wrap the base of the wall with 6 mill poly. This prevents the wood from absorbing any excess or concrete moisture. Using 2x4studs I would leave 1.5 in space between the concrete and framed wall. Using R22 will leave a bit of air space which will be enough. After framing. Install your batts flush with the face of your framing. Apply your poly from floor up to floor boards. I use a rigid foam board for a tighter fit and seal between the floor joists. Naturally all your exterior electrical boxes will be sealed when your electrician installs.
Dennis,I'm not sure what your saying? Please say again from concrete wall to studs.
1.5 from concrete wall to backside of 2x4 wall. Run a chaulk line 5 from the concrete wall and lay your framed wall along the line for guidance.
Or if your concrete is really straight then just lay a few pieces of 2x4 on edge against the concrete and build your wall tight to the 2x4 pieces.
We always check for crack or leaks in the concrete first. Drill into them and inject concrete sealant in anything we find.
Then we glue on R-10 ridged foam board. We use the proper tape on all the seams between boards. Remember to take them up between you floor joists until you come to the sub floor.
Then we run our lines and perp for the baseboards for the walls. All of these should have waterproof underlay.remember to leave a 1 1/2" space from the foam to the subfloor. Then ramset these boards.
You can now finish framing. Then do all of your electrical and plumbing. Now you can add the batts of insulation you buddy gave you.
James Thanks for reply but still confused . R10 foamboard on concrete wall then gap, then 2x4 wall with r22batts? Do i put 6mm poly on 2x4 wall or is it overkill. I have subfloor in .
No, don't bother with the poly.
Just go the route I posted and the fellow from Winnipeg posted and you will be good. Remember to use the rolls of white foam under the bottom planks for all the wall framing in the whole basement.
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