
Originally Posted by
Irving
Global media loss on it's own is not considered to be hail damage. Essentially the roof is a wear item, I liken it to a brake rotor, and media loss is a normal aspect of wearing. Localized media loss, specifically from a hail impact, as opposed to a blister, is considered damage. Now to your actual question, the roof can lose 100% of the granules and still maintain its integrity, for a time. When you've lost enough granules that you can see large areas of uncovered asphalt, it's time to start planning on a new roof. To clarify my usage of "large," you should be able to clearly identify areas from a standing position, or be able to determine a measurable percentage of shingle that is completely void of granules. That is to say, if you have to crawl around to find areas of the bare asphalt layer, its not yet a big deal. The age of the roof will play a role in your analysis to determine if there is a defect present in the shingle. This is of course my personal opinion based on my experience.
It's a good idea to occasionally check the condition of your roof, but that does NOT mean turning in a claim. Turning in claims can have a negative effect on policy rates, so claims should not be used as a "check-up." A contractor will usually look at your roof for free, but since they maker their money by selling roofs, it is possible that you'll be provided with exaggerated claims as to the status of your roof.
I could look at it sometime if you need.