A roof leak repair has two parts: finding where water enters, and fixing the cause so it does not return. The first part is usually the hard one.
In the first hour
- Move people, equipment and stock away from the drip
- Catch water with buckets and protect floors with plastic sheeting
- Photograph the stain, the drip and any damaged contents
- Note the time, the weather and how heavy the rain was
- Call a roofer for a temporary repair once it is safe to go up
Where leaks usually start
- Flashings at walls, curbs and parapets
- Penetrations such as pipes, vents and conduit
- Drains that are clogged or have failed seals
- Seams that have opened or lifted
- Punctures from foot traffic, dropped tools or storm debris
How professionals trace a leak
Roofers start above the stain and work uphill against the slope, checking every detail. When the source is hidden, they may use a moisture meter, an infrared scan after sunset, or a controlled water test on one area at a time.
Fixing it properly
A lasting repair matches the existing membrane and fixes the cause, not just the hole. If the insulation under the leak is soaked, it should be cut out and replaced, because wet insulation keeps feeding water into the building.
Read more about commercial roof repair and the maintenance that prevents most leaks.
Common questions
Why is the leak far from the stain?
Water travels along the deck, insulation and structure before it drips. The entry point on the roof can be many feet from the stain on the ceiling.
Should I go on the roof during a storm?
No. Wet roofs are slippery and storms bring lightning and wind. Protect the interior, document the damage, and wait until it is safe.