PolyTech

The person who answered my call was very professional and helpful. She was able to arrange the repair to fill a deep void under my sidewalk and front entryway slab. Normally they will come out for a quote first but I was in a time crunch so they were able to work me in 2 days later.
The two workers came out and discussed the process and estimated costs. They do have a minimum of $ 350 which covers 15 lbs. of fill. That is a lot of fill. It is $ 10/​lb. over that amount. Plus they can caulk cracks for an extra amount. They jacked up the sidewalk until it was even and drilled 1 – 2 very small holes into the concrete and inserted an injection tube fitting.
Starting at the slab they filled the voids and worked their way by section. Our issue was caused by snakes and poor water drainage. There was a large amount of area to fill. It is a slow process to obtain a good seal and it worked great. They use a sand to cover the extra ooze so that it doesn’t stick to anything. It cuts away easily when they are done. Holes are then plugged and cracks sealed. It all went perfect.
The next morning there was a horrible smell but after a few hours it went away.
These guys are great and it worked perfectly.
Much cheaper than concrete repair and very solid immediately. Holes were patched nicely and if I ever need another area patched I would call them.