My enclosed sunroom has a short stone wall on the sides. There are about 5 built in openings (for drainage) that aren’t worth the heat they let out or the critters and birds that come in. I need ideas for closing them off. I thought: stuff a chunk of foam in it (not pretty and temporary at best) or that foam spray. I think it’s called Great Stuff. Where I’ve seen it, it looked pretty gross, but maybe it could be shaped and painted after it is hard.
Ideas?