Common causes include aging as well as wear due to climate.
Curl up in attic.
You may see cracking at various points.
Three reasons for premature curl are.
This is the perfect nook to curl up in on a freezing winter night.
Poor attic ventilation roofs get hotter and have excessive moisture rising up under the sheathing when there is inadequate air flow.
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This most often occurs when moisture builds up in the attic in hot humid conditions.
Bad attic air flow inside your house warm and humid atmosphere usually rises near your attic.
Do not walk on cupping or curling shingles.
Perhaps weatherization work or changes in your hvac system have increased humidity levels in the attic.
Blistering happens with humidity levels get too high around the shingle.
Check for duct leaks or other moisture sources such as bath fans venting into the attic.
Hail along with massive variance in heat are typical causes for asphalt shrinks leading to cupping and curling.
These are early signs your roof is starting to fail.
This is when you start to see the edges of the shingle curl up.
It should come in through the soffit and and rise out of vents at the ridge of a roof.