Horizon Contracting repaired my foundation wall this year by injecting it with this foam urethane. I thought they had do dig up the yard but I have a large central A/C unit where the crack is an the gas fitter (from Embridge) was going to charge me $1200 just to move it for the repair. I found Horizon contracting through a friend and they told me to ask if there was any alternatives. So I asked and they said they could do it from the inside. It was a lot cheaper and quicker than digging and the bottom line is it stopped the leak. I phoned around to see how their prices compared and no one would give me a price over the phone exept Horizon. They were great and I would use them again forsure.