Short answer: winter rain in Central Texas is slower, steadier and longer than summer rain. That kind of sustained soaking finds weaknesses that a fast summer downpour runs straight off.
Most winter leaks are not new damage. They are spring hail damage, a cracked pipe boot or a failed flashing detail that has been waiting for the right conditions.
Why winter exposes them
- Rain duration. A summer thunderstorm dumps hard for twenty minutes. A winter front can soak the roof for two days. Sustained saturation gets past details that shed a short burst.
- Lower sun angle and shorter days. Roofs stay damp longer. Less drying between rain events means moisture has more time to work in.
- Thermal cycling. A 70 degree afternoon and a 35 degree night move materials every day. Sealants crack, fasteners work loose, small gaps open.
- Brittle shingles. Below about 45 degrees asphalt stiffens. Shingles already aged by Texas summer crack rather than flex.
- Wind driven rain. Winter fronts bring sustained wind with the rain, which pushes water sideways and uphill under laps in ways that vertical rain does not.
- Debris in valleys. Fall and cedar season fill valleys right before the wettest months. See our debris guide.
The usual suspects, in order
- Pipe boots. The rubber collar around plumbing vents cracks after 8 to 12 years of Texas UV. The most common non storm leak we find, and among the cheapest to fix.
- Chimney flashing. Especially on older homes. See our chimney guide.
- Valleys packed with oak and cedar debris, backing water up under the laps.
- Roof to wall transitions missing kick out flashing, which drives water behind the siding instead of into the gutter.
- Skylights with aged seals or reused flashing.
- Wind damaged shingles from a storm months ago whose broken seal strips finally let go.
- Gutter overflow from clogged gutters, pushing water back under the roof edge.
Condensation is not a leak
Worth ruling out first. If the moisture appears after a cold clear night with no recent rain, that is attic condensation rather than roof failure, and the fix is completely different. Our condensation guide covers how to tell.
Why the stain is not above the leak
Water enters at a penetration, lands on the decking, runs along a rafter, crosses to a different part of the attic and drops through the ceiling somewhere else entirely. We have traced leaks that entered fifteen feet from where they appeared.
This is why a patch applied directly above the stain usually fails. The job is finding the entry point, not sealing the exit.
What to do when one starts
- Contain the water and move belongings
- If a ceiling bulges, a relief hole over a container prevents a larger collapse
- Photograph everything for a possible claim
- Check the attic with a flashlight during rain if you can do it safely, since seeing active water narrows the search enormously
- Do not climb a wet roof
- Call for an inspection, and tarping if it is bad
Repair now rather than in spring
A winter leak left until spring soaks decking and insulation for months, which turns a few hundred dollar repair into decking replacement and drywall work. Winter is also our most available season, so you will get out of the queue faster than you would in May.
Request an inspection or call (210) 245-4125. For active intrusion see emergency roof repair.
