First off I want to say that the crew battled temperature in 90's and still completed the job in one day. Great effort for the company. Two words "sinking concrete" . This was my problem and your ads described the fix. I had one company who wanted the job but only wanted me to send pictures of problem and they would bid it out without coming to see it. They even called back the day after the job was completed. They used mud. You visited the problem and told me confidently you could fix the problem and that was all she wrote.