ALL my contracts are comprised of two parts. On the back is the service agreement and labor warranty AKA the fine print.
On the front I simply state what I am going to do(scope of work), this I call my proposal. When signing the proposal the customer is bound by the service agreement and labor warranty.
I type my contracts so it's easy to make changes on the fly. If you are looking for a pre printed form, you might be looking for awhile. Perhaps ask the manufacturer of your metal roofing products.