I hardly fry fish anymore baking them is as easy and less smell. Last night I baked some crappie. here is what i did. Spayed a 9×12 glass caserole dish with pam olive oil spray. Layered the bottom with the crappie. Then covered the fish with a bag of green Giant Basil vegetable medley veggies. There is a season sauce with the veggies that added a great flavor to the fish. After about 20 min of baking the fish I mixed everything up and baked it for 10 min. or so longer.

it is concrete it does shrink and expand. that first pic looks like its a box opening maybe for a drain? I still would not fill the gap. And I agree don’t use ridgid insulation use fiberglass and remember that you dont want to jam the insulation in the gap you want it to be snug. or it is not able to do the job that is needed.

No do not fill that gap. if water were ever to get in thru your walls going down that gap to the drain tile is neccesary. Attach poly to the block wall to act as a vapor barrier than frame your walls 2×4’s, Metal studs,etc. do your wiring,plumbing, and heating if needed than insulate with a r-11 insulation that is NOT paper backed. Sheetrock your walls and hold the sheetrock up 1/2 inch off the floor. If your floor gets wet your sheet rock will wick it up. Good Luck,Pat