I have 1/2 of a Semi-Detached and I am going to try to finish the basement of. Currently the basement is poured concrete walls. To get some grants I need to hit R-24 on all 3 exterior walls.
I have an issue with figuring out how to finish around the stairs... The stairs to the basement start about 4' off the wall and you enter from ground level into the basement facing the wall... you go down 4 steps then there is a small landing (4'x4' square) and the stairs turn right and finish going down into the basement along the concrete wall. A stretch of about 15' of basement wall. The steps of the stairs are attached to 2-2x6's on their side (e.g. 1 1/2" each for 3" width) which is snug to the concrete. Hence I have about 3" of give in the steps give or take.
How would you insulate this section of the wall? I am not sure if I am supposed to use rigid insulation, batting (but thin in this section, say R-12), or some other form of insulation?
Any tips is appreciated. Because I am going for grants and rebates for finishing the basement I am doing R24 insulation (2 x R12) and the stairs could prevent me from getting $2500 in grants