this post was submitted on 07 Jun 2024
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Expanding spray foam.
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
Also a huge fire hazard, don't do this.