Insulating interior basement walls with rigid foam board
My house was built in the 40s. The basement walls are not smooth. There’s approx. 6 horizontal lines from the basement floor to floor joists that stick out about 1/4inch. The rigid foam board will not be sitting perfectly flush on the wall, is this a problem?
The joists were set in the concrete. How do i insulate the space between the bottom of the joist and the top of the joist? With scraps of rigid foam or with spray foam?
I understand that to make the wall ready for electrical and drywall, i have to fasten wood to the foam. The thought of putting that many holes in my concrete foundation scares me.