Can a roof with a ridge vent to have two shingle layers?
Hey all, I’m looking to put an offer on a home that’s part of an estate. The seller has no idea if there’s one or two layers on the roof and I couldn’t tell when walking the property (no ladder). But the house has a ridge vent. Does this make it far more likely it’s one layer, or do some homes with ridge vents still have two layers of shingles?
Thanks!