I have a rather unfortunate problem, rats got into my crawlspace and managed to tunnel directly underneath one of the internal piers(there are quite a few down there, maybe every 8 ft square?
I am in the process of collapsing their tunnels but this will need to be fixed, the pier isn't very deep(maybe 6 inches in ground?).
How would you recommend fixing this issue?
If I could build a form around the pier and inject concrete into the tunnel I suspect this would be sufficient but I don't know. I don't know of any mini concrete pumps though.
I should also say this is a 1 story house built in the 70s, pretty low load.