Need To Spray Expanding Foam

[George7941]

This is in the garage. It was foamed about ten years ago to prevent mice from coming into the kitchen which shares this wall with the garage. It accomplished the job and kept the mice out.
Recently mice have started coming in again. I don't see any obvious gaps, so I was thinking of just redoing the foam. There is about twenty five feet of foam to be applied.
How much of the old foam do I need to remove to apply the new foam? Would digging out about 3/4 inch of foam be enough for the new foam to bond well into the gap?

This is what I am planning to use. Will this cure at freezing temperatures? We are now around 0*C in the daytime. How long after spraying before it can be trimmed?

 

[skyactiv]

I assume you know, but just incase someone else reading this thread doesn't, they make rodent/pest blocking foam, too.

 

[George7941]

I saw the pest resistant foam at the Home Depot site. Apparently it contains a bittering agent.

It is twice as expensive, so I was debating whether to spend the extra money.

 

[2010Civic]

I'd spend 2x to potentially reduce the chances of having mice in my house.

 

[Danno]

I would place some of these on the cold side of the house, and around the perimeter.

Think layered defence.

https://www.canadiantire.ca/en/pdp/...door-disposable-2-pk-0591678p.html?rq=tom+cat

 

[MasterSolenoid]

I would place some of these on the cold side of the house, and around the perimeter.

Think layered defence.

https://www.canadiantire.ca/en/pdp/...door-disposable-2-pk-0591678p.html?rq=tom+cat

A multi-pronged approach.
I'd also put some glue-traps or snap-traps 'inside' the garage.
Note: only 'in' the garage. Placing outside could trap birds.

 

[Pablo]

I would foam with the good stuff AND put a metal trim/barrier piece meeting up with the concrete. Aluminum or coated steel or even stainless steel. Enough time rodents will make it through foam/thinish plastic. Insects/rot same with wood.

Ask me how I know this. In spades and I'm on my........what 7th house I think. Hahhaha

I have used some very thick HDPE trim (even painted it) and and did the trick as well. I think rodents know it's just too thick.

 

[Danno]

A multi-pronged approach.
I'd also put some glue-traps or snap-traps 'inside' the garage.
Note: only 'in' the garage. Placing outside could trap birds.

Yes, I use the glue traps in the garage, one on each side of the man doors and overhead doors. And inside the house in along baseboards. The glue traps have caught creepy crawlers. The bait blocks have managed to keep the mice outside the house. They have eaten quite a bit of the bait, so there is outside mouse activity.

https://www.amazon.com/Catchmaster-...=1770932420&sprefix=glue+traps,aps,140&sr=8-1