Thoughts on insulating — renovation
I ‘m trying to decide what insulation value to go with on a house we are renovating in Toronto, ON. It’s a 1 ½ storey that we are making 2 storey with adding addition on the back and attached garage.
The 1st storey walls are to be left, 1950s double brick walls no insulation. The 2nd storey I would like to go with either 2×6 with R24 Roxul or 2×8 R28 or 2×4 x2 with 3xR14=R42 and 3”Roxul Comfort board IS R12 on the outside.
So I get either R36/R40/R54, but on the main floor inside I can only go 2×4 R14 or 2×6 R24 max, plus I’ve been told the brick =R4???? Then the 3” R12 outside for R30/R40 Is it worth it to go R54 upstairs if down is not even close, will I have issues with the uneven top to bottom R-values???
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