I need an engineer to serve as a retained expert in my civil litigation case filed in Cook County, Illinois. I represent a roofing contractor who is suing the building owner of a 11 unit residential 2-story building located in Chicago, Illinois. The contract was for a flat price of $25,995. The owner paid $12,995 down but then terminated the contract when the work was almost done and refused to pay balance under contract because water pools in middle of roof. Water also pulled in middle of roof before work was commenced. The contract is silent about water pooling. The contract called for tear off and reroof. Permit did not allow for any structure work, just tear off and reroof. There is no possibility this case will settle. I need an engineer that can detail reason for water pooling and give an opinion as to whether the work done by the contractor was within the scope of work under one page contract and was done within standard of good workmanship.