Norman, OK
The house may have a build date on every listing and no reliable date for the roof above it. If you inherited the covering when you bought the home, that gap is understandable. Installation records can establish its age; an inspection can establish its condition. You can make a sensible roof decision even when the first answer stays uncertain.
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You don't need to get on the roof to keep it in mind. A blocked downspout, a branch touching the shingles or water spilling over a gutter can tell you it's time to arrange some upkeep. Looking from the yard is useful. Working out what the roof itself needs belongs to the roofer.
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A knock after a hailstorm doesn't tell you whether your roof needs work, or whether the person at the door is the right one to do it. You can take a name, leave the appointment undecided and get the roof looked at on your own terms. The useful questions are who would be doing the work, what they found on your roof and what you're being asked to sign.
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