Once your roofer starts tearing off your old roof, he is responsible for keeping your home safe and dry. He must take measures that will prevent any leaking during the re-roofing process. Once he has exposed the raw plywood decking, covering it back up with the dry-in materials becomes paramount.
A good roofer will never leave your roof open and exposed over night and you should never tolerate it if your roofer does. The cost of rain damage can be so substantial that you could lose your insulation, ceilings, interior items, as well as your own personal belongings. The only way to describe this irresponsible act is pure negligence. In the event of impending rain, the roofer should delay starting or proceeding until the rain has passed.
A professional roofer does not begin tearing off your roof until he has on the site enough of the right materials to dry back in the area he intends to open. He should always be able to cover the area quickly in the event of a storm suddenly appearing. Getting caught in between processes is carelessness and total disregard for your property.
At the bidding stage of your roofing project, request that the roofer reveal his plan for handling the tear-off stage, the securing of the dry-in stage and the installation stage of the project. He should explain in detail how he expects to proceed as well as what he expects to accomplish each day. Ask him about material delivery schedules and how he intends to deal with conceivable problems that might arise. This should not be his first rodeo. If he is a good roofer, then he has a very responsible procedural schedule. This will be a repeat of what has been very successful for him on previous projects. Then before he begins, go back over the project procedures and schedules with him and question any changes. We can work with you to insure that everyone agrees on how to proceed so that nothing is missed or misunderstood.