Is there an expandable building material that can fill large voids in walls to prevent mice from entering?

Question

I need to fill in a large sidewall next to a radiator that has an irregular shape.

Answer 1

There is expanding insulation that you can spray into it, but I would not use anything that a mouse can chew his way thru. I would pack the hole with steel wool instead, and then seal it with caulking or drywall mud. Steel wool will stop them every time.

Answer 2

I would caution you about the expanding foam. It can be very effective but it also can put a huge amount of force on things like dry wall if it is sprayed inside the wall in too large a quantity at one time. It can cause the wall to bulge.

Answer 3

Bob vila used expandable foam insulation in one of his shows. put a line of it btw studs and it expanded to fill the whole region (even had to cut some off. Than might help.

Answer 4

Depending on how big this project is....there's a foam insulation you can drill hole in wall and squirt it in.

Answer 5

foam spray in a can