I have a unfinished basement where my wood furnace is currently and plan on putting up 2" eps foam board on my concrete walls to help keep the cold winter air off my furnace. The problem I'm having is blocking concrete foundation seems to have pink insulation under the sill plate and not the correct sill sealer that most house have. I can stick my hand in the hollow cores of the block. I'm worried about putting the foam board over the hollow gap to the wall foam board and causing moisture to wick through to the pink insulation to my sill plate. How about you go about this?