It'll take them an awfully long time to chew through the cement products...
To put it a little more plainly, if they can chew through the concrete products, then thay are not normal rats.
YES they can, the sement if they start on an end piece can get enough out to get under it .
Thanks, all the seams have either cement caulking or can foam insulation on the 3x5 hardiboard on the top we used again the foam and on the bottom we used motar cement how did I do cyrus123 16 hours ago .
Rats can chew through just about anything. The expanding foam you refer to would be no problem for them. I have seen rats chew through wood and hardiplank.
The foam you refer to is tough, but not as dense as these. They can chew through it. The best you can do is bait for them, and leave their hole open.
They usually eat the poison, exit to find water, and then die. I hope this helps.
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