For instance, no inspector would be asked to access a 14/12 slate roof
BH: Actually, the Texas SOP requires inspectors to walk all roofs or to disclaim the reason for not doing so. Furthermore, the inspector must inform the client of this upon first contact.
You manage expectations by a comprehensive contract.
BH: Again, Texas SOP requires that statements of departure from SOP be in the report, not in the contract. Additionally, and perhaps more importantly, in order for a contract to achieve the level that you are aiming for, in might be longer than most courts would expect for the average person to actually read.