My basement has some glass block windows, that seem to be improperly (or not-optimally) installed. See picture....
As I understand it, there should has been a perimeter channel attached to framing, and the glass blocks installed into that. As it is, I get a little cold air radiating (possibly leaking from outside) out the top.
I was thinking of using spray foam to cover the top, but I'm not sure how that will affect the gaps between the blocks. I'd like to seal it as best I can, and then possibly use XPS + foam on top.
I wonder if I can cut up a perimeter channel and use some caulk to glue/seal it to the top? I'd have to do it in several pieces (one strip between each set of joists).
Edit - In case it matters, here is the larger view; I might do something a little different where that cold air return duct is.