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The stain is almost never under the leak

Roof Leak Repair in Katy, TX

Water finds the lowest cool surface it can reach, runs along a rafter, and drops where a ceiling happens to be weakest. The job is tracing it back up the slope. In a Katy attic it also means ruling out things that are not the roof at all.

Not Every Ceiling Stain Is the Roof

Katy houses are slab-on-grade, so the air handler sits in the attic, with its condensate pan and drain line above the ceiling, and the upstairs supply plumbing often runs through the same space. A stain after a dry week is more likely one of those than a roof leak. A stain that appears only during and just after rain, or only when the wind pushes rain sideways, points at the roof, most often at a penetration or a wall intersection rather than at the field of shingles.

A dry-day attic inspection separates the two. The contractor looks at the underside of the decking around each penetration, follows the staining to its highest point, and checks the air handler pan.

Where Katy Roof Leaks Usually Start

Wall intersections

Where a two-story brick or siding wall meets a lower roof, step flashing and its counter-flashing carry every drop of water that runs down the wall. Older siding failures dump extra water here too.

Vent and exhaust penetrations

Split plumbing boots, loose bath-fan caps and old roof-vent seals.

Valleys

Articulated rooflines on production homes have many valleys. Debris and nail-punctured metal are the common causes.

Wind-driven rain at edges

After a storm event, lifted drip edge and unsealed tabs at the rakes let sideways rain under the shingles.

Underside of roof decking in an attic with a dark water trail running down from a nail tip

What Happens If It Is Left Alone

In a hot, wet attic a slow leak has time to do more than stain paint. Insulation saturates and packs down, the sheathing softens, and mold has both the moisture and the temperature it wants. A leak that shows up as a small spot on a bedroom ceiling has usually been active for some time. Getting the source stopped comes first; drying out what got wet is a separate job for a separate trade.

Roof Leak Repair: Questions

How do I know the leak is the roof?

Timing is the best clue. Stains that appear with rain point up; stains that appear on dry days point at the air handler or plumbing overhead.

Can a leak be repaired in the rain?

Contractors can often place a temporary cover. A lasting repair generally needs dry decking.

Is a leak a reason to replace the roof?

Only if the roof is otherwise at the end of its life. A single-source leak on a sound roof is a repair.

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