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What's the best way to fill these holes in my laundry room?
(sh.itjust.works)
My goal is to keep hot/cool air from seeping between floors. Is canned spray foam the way to go? Any recommendations? Pest resistance is a bonus.
Don't do that, there's wires and pipes in there. If anything needs maintenance or replacing it's a nightmare with expanding foam gluing everything together.
Just put in some steel mesh on the bottom, fill with isolation materials, lock it in with more steel mesh and put a nice cover plate over it.
You can cut it with a knife or a jab saw. It's used in AC installation all the time.
Once dried it's quite easy to just rip foam out