The AC impostor
That ceiling stain in a hallway or near a closet in August is very often the air conditioner, not the roof: a clogged condensate drain line or rusted drain pan overflows into the ceiling below the attic unit. Check the secondary drain outlet at the eave - if it is dripping, your AC is crying for service before your roof needs anything.
Thermal shock: the 60-degree plunge
A shingle surface at 140-150 degrees hit by a sudden 75-degree thunderstorm contracts violently. Aged shingles split at the weakest point, sealant joints crack, and marginal flashing opens. This is why leaks appear after brief summer storms that "were not even that bad" - intensity of temperature swing matters more than inches of rain.
Dried and done: boots and sealants
Neoprene pipe boots are rated for years, but Texas UV halves that. By August, boots installed five-plus years ago show radial cracks that leak in the first fall rain. Sealant at vents, satellite mounts, and exposed nail heads fails on the same schedule. A maintenance visit that re-boots and re-seals penetrations is the cheapest leak insurance in roofing.
Frequently asked questions
How do I tell an AC leak from a roof leak?
Timing and location: AC leaks appear during hot dry weeks near the indoor unit; roof leaks follow rain and track from penetrations or valleys. A moisture meter and attic look settles it in minutes.
Why does my roof leak in some rains but not others?
Wind direction and rain angle. A leak at a north-facing flashing only opens in north-driven rain - which is why fall fronts expose leaks summer storms missed.
Is a small ceiling stain urgent?
Yes - stains mean saturation already happened above. Small stains are cheap fixes; ignored ones become decking, insulation, and drywall replacement.
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