We used A-1 to install 4 piers to correct a sinking foundation on a old room addition. The piers corrected the problem HOWEVER they installed one of them directly into our main sewer line. The sewer line held and didn't collapse around the pier for 7 years, we were "lucky" they said, but when it did it was a $12,000 repair. When the plumbing company dug out around the main line you could clearly see the pier going directly through it. We called A-1 to come and see it. The owner, Ron Nichols, came and acknowledged the problem they caused and said he'd be in touch. We sent him pictures with a letter and heard nothing. Send another letter, again no reply. Finally after we had an attorney send a letter, Ron sent it to his insurance company which, of course, denied the claim saying they couldn't be sure that caused the problem. (The pictures clearly show it did and the plumbers were sure of it too.) If we decide to follow up with a lawsuit it could easily cost us another $10k in attorney fees, and we're not guaranteed a positive outcome. (I'm sure the insurance company is counting on us not pursing it further.)
IF you choose to use A-1, please be aware that they take NO RESPONSIBILITY for knowing where your water and sewer lines are. When Ron came to see the damage and saw the pier going into the drain line he actually said nonchalantly, "Usually this happens in a few days" - meaning the broken main line. That was disturbing. We mistakenly assumed that as a professional doing this kind of work that he would find out about such things before they began working. No, they just take their chances. I would NOT recommend A-1. read more