A few spots on the top of my basement wall have had their tops hacked off for projects (ducts/plumbing/unknown). We had a mouse issue and I'm looking to close these spots up in case they are finding their way in somehow that way.
My main question is should I cap/cover them off again with some sort of tile/adhesive or do I need to fill them?
The first two locations are against the back of the house but there is another room/slab further out above it and it looks pretty dry down in the "void" of blocks. They don't appear to be filled or reinforced. I was planning to just cover these up.
The third location which is on the side of the house is where I'm unsure if I should also fill it in with rocks/mortar/anything recommended? or also just cover it up on the top. It's a difficult spot to get access to but the pics show the outside walls mortar and further into the gap there is some dirt. If you're looking at the first of these "3rd location" pics the wall to the right is where the garage would be.