They probably just roof loaded it to make sure it was ready when they were. I usually deliver materials a day or two before we start the job, but I always tell the customer we are coming.
The procedure for repalcing the membrane is what your contract says. Is the old roof being torn off? Is insulation being installed? How is the insulation being attached? How is the new membrane being attached? can't tell you how it's going to be done without seeing your contract and what you bought.
The procedure for repalcing the membrane is what your contract says. Is the old roof being torn off? Is insulation being installed? How is the insulation being attached? How is the new membrane being attached? can't tell you how it's going to be done without seeing your contract and what you bought.