XPS around drain pipes?
I have a mostly buried basement in Maryland that I am finishing. I will be using 1.5" XPS (R value 7.5) on poured concrete exterior walls mounted with furring strips. Then 2x4 framed walls with unfaced fiberglass covered with drywall.
Running along some of the walls, I have a 3" drainpipe 3' from bottom and 5' from top going out to septic system mounted directly to the concrete. My question is this:
Can I install the XPS above and below the drain pipe? Would that defeat the advantages of the XPS? I can move the drain pipe out if required but that would be a real challenge.
Thanks in advance!