We can understand the difficulty in estimating materials for a job such as ours. This job was a driveway and a pool deck-lanai. The driveway had used all the quoted materials plus some. Our technician went over and above and drilled about a dozen pilot holes in the pool and lanai area to help us decide where the biggest problem areas were. We ended up going over on materials by 19 pounds, but felt this went a long way toward correcting the real issues (while remembering that this area of repair covered about 60 or 70 square ft, as opposed to the entire pool deck and lanai). Time will tell if we made the right decision on repairing only the small section failing the pilot hole testing, rather than going with the initial tap "sound" test suggesting that the entire area needed filling. The tap test on the driveway even though it used more material, was surprisingly accurate in that the extra materials seemed to be used in the areas where Tom thought he detected the biggest voids. In regards to the lanai and pool area, we wonder if the band shell effect produces a false positive and if pilot hole testing would be a better alternative here. In any event, we are confident that the work done by NSquare, Inc. will prove to be a huge asset to our property going forward.