One of our customers was found by us when we told him that his vents were damaged, in fact so chewed that there was no flashing left. Basically he had a leak at every vent that was like a waterfall into his attic. He fixed his vents about 3 months later after we recommended a roofer and then purchased Critter Quitters to keep it from happening again. So if you get a new roof, protect it with CritterQuitters.