The asphalt shingles on our home are approximately 20 years old.
How do we determine how much life is left on our shingle roof without
waiting for it to leak? I don't want to replace unnecessarily but also
don't want to have major water damage. Thank you for your suggestions.
Look for cracking, seperation, loss of the coating on them, Susan. If they
become brittle it's time for a change. How much gravel do you notice in
your gutters (if you have them?) This is coming off the shingles. Take a
good look around the drip ledge at the ends of your roof. You should notice
good square corners on the shingles. If they are rounded, you might be
What Jim said. I'd just like to add that shingles usually come with a
manufacturer's designated life expectancy. I had older 20 year rated
Bird asphalt shingles that were still fine after 27 years. We changed
them only because we added an addition and were putting a new roof on
that. Contrast that to the awful GAF fiberglass shingles that were
put on an earlier addition. It had a rating of 25 years, but was
leaking after 12 years. GAF had enough impediments so that we were
never able to get anything out of the warranty. When we did the new
roof, we went back to asphalt (IKO Chateau) with a 30 year rating.
And I'll point out that this is all highly climate dependent. For
example, here in Phoenix AZ, 20 year rated singles rarely last much
longer than 10 years, because they get the volatiles baked out of them
(typical surface temperature for shingles in the Arizona sun can reach
180 degrees!) and turn brittle and crunchy, to the point where
shingles can actually *explode* when the monsoon rains sweep in and
splatter water onto those shingles. No kidding. And hey, we can fry
eggs on our sidewalks in summertime too, and can make hot tea just by
putting water and tea bags in a glass jar and setting it out on the
Eric Lee Green mailto: firstname.lastname@example.org
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