My customer called to ask me what was the problem with the sod they had another company put in. While I was out there mowing I took a look and I used a small screwdriver to probe the ground and within 3 inches in just about every affected area I was running into very solid and gritty material, possibly paver base. I know for a fact that they have been wattering daily since late june (against my suggestion) when this was installed till late august when he called me about this problem. So just about all of the sod is still loose, no penetration into the existing ground. In addition I looked under a piece of sod the week it was installed and there was no starter fert applied. Also, the places where sod was patched into the existing lawn were obviously higher than the rest of the yard.