The roofers GL insurance. Most carriers require a roof to be securely tarped if it will be left open for more than 2 hours. Hope he has the right coverage as there are carriers that have an open roof exclusion.
Thank @Joe Bertolino
I have since talked with my contractor and he has assured me of what you have said but also said that since the damage looks like it will be a relatively easy fix with just some drywall and insulation replacement, he will eat the charges and not worry about insurance which will save me time i think as well.