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Yes, a roof blister can cause a leak if it gets to the point where it pops. Prior to popping, a roof blister is just an aesthetic issue, but once it pops, you’re left with a small hole in the shingle. Water from rain and snow can easily get inside this hole and interact with your underlayment, roof decking, and the building material below.

Yes, hail damage to your roof can definitely cause water leaks in your roof. This is because hailstones can break, chip, crack, or split shingles of all types, exposing underlayment. This underlayment doesn’t offer as much protection against water, so when it becomes compromised, water can penetrate and leak deeper into your home.

Whether replacing the entire roof or just installing roof shingle replacements in small areas, always pull up the old roof shingles. While you can technically put new roof shingles (but not other roof materials) over old shingles, this can add weight strain to the roof and prevent the new shingles from securing properly to the roof.

Generally, hailstones that are one inch in diameter or larger can cause significant damage to a roof. However, smaller hail can also cause damage, particularly when accompanied by strong winds, if it strikes an aging or poorly maintained roof, or if hailstorms are frequent in your area. Hail that is ¼ inch (pea-sized) or smaller poses a minimal risk of immediate, permanent damage, but cumulative impacts can cause deterioration over time. The extent of the damage also depends on the roofing material; hail-resistant tiles like slate or certain types of asphalt shingles can withstand impacts better than other materials. If you are concerned about potential damage after a storm, it is always a good idea to have a professional roofer conduct an inspection.