Which is the best foam board insulation to put against poured concrete basement walls?
I have read and read until I am blue in the face with a migrane! I'm thinking/ hoping that I've finially gotten the insulation aspect of finishing our basement correct, but I'm still not sure. The two different kinds of foam boards I've been looking at are, Kingspan Insulation R-10 2in*4ft*8ft unfaced polystyrene foam board from Lowes and the Foamular 150 2in*4ft*8ft R-10 unfaced squared edge insulation sheathing from Home Depot. Are either of these two efficient and effective? We have baby number 4 due in March. We're on a tight budget, but also do not want to suffer the consequences of mold at a later date.
Also wondering if I should use drylok waterproofer paint on the concrete before applying the insulation board. I've read so many contridictory things from so many websites and forums, I am at a loss.
Thanks so much for the help!