I am servicing several yards in a new neighborhood and every yard has rock right under the sod. The prep job was not done correctly and everyones yard is turning brown fast with the little moisture we have had and even the ones that water daily are starting to get brown with the 90+ temps we have here. I have been told that the hot sun heats up the rock under the sod and causes water to evaporate quicker than normal and the heat also causes damage to the roots. Even though the roots have nothing to grab onto. I want to know if you have heard of this and if there is any published information about it out there so my clients can get the yard replaced by the builder. I posted this under renovation first with no help. I thought I would get more hits in the mowing forum.