Start inside, not on the roof. Trace the stain to the attic, look for wet wood, insulation and daylight along the path above it, then work upward and outward, because water usually enters higher up than it shows. Ground-level clues outside and a clear set of notes can then take a roofer straight to the problem.
Why start in the attic?
The attic is the underside of the roof, and that is where water leaves its trail. You can see staining, wet insulation and light coming through gaps without ever stepping on a ladder against the roof edge. You also stay out of the weather and away from the hazards of a wet roof.
Safety first. Use a pull-down stair or a hatch, bring a flashlight, and stay on solid framing or a planked walkway. Never step onto ceiling drywall between joists. If the attic is hot, cramped or hard to reach, skip it and have a roofer do it.
How do I trace a leak step by step?
- Mark the stain. Note the room and where the stain sits relative to exterior walls and fixtures. Take a photo with something for scale.
- Go to the attic above it. Find the matching spot. Look for dark or wet wood, flattened or damp insulation and stains on the underside of the deck.
- Move uphill. Water runs down, so the entry point is typically higher up the roof than the stain. Follow the staining up the rafter or deck toward the peak.
- Look for anything that interrupts the roof. Chimneys, vent pipes, skylights, bath fan ducts and walls that meet the roof are common sources.
- Turn off the lights. On a bright day, small beams of light show openings around penetrations and boards.
- Check for non-roof causes. Plumbing lines, air conditioning drain lines and bath fans venting into the attic can all create wet spots.
- Take notes and photos. Record what you find, where and when it appears.
You may not find the exact spot. That is normal. The goal is a good set of clues, not a diagnosis.
What clues can I find from the ground?
With binoculars or a phone zoom, from the yard or the street, look at the area above the stain and along the line you traced:
- Missing, lifted, cracked or slipped shingles
- Flashing that is bent, lifted or pulled away at chimneys, walls and vents
- Exposed or rusted nail heads
- A sag or a dip in the roof line
- Granules piled in gutters or below downspouts
- Debris, moss or damaged ridge caps
Do not climb up to chase any of these. Leaning a ladder on a wet roof edge is one of the more common ways homeowners get hurt. Take photos instead.
Why can some leaks be so hard to find?
Water can run a long way along framing before it drops through, so the stain and the entry point may be several feet apart. Low-slope and flat sections are among the hardest, because water can sit on seams and travel across the surface. Our owner, Jeremy Hays, says that hard-to-find leaks are the ones he hates, and he describes a clean-looking flat roof that leaked in strange spots. That is a typical trait of low-slope roofs, which we explain in our low-slope roof guide.
A professional may use controlled water testing, moisture meters or infrared tools. These are jobs for trained crews, and some leaks only show up in particular wind and rain conditions.
How can I contain the water in the meantime?
- Place a bucket under any drip and a towel or plastic sheet under it to protect floors.
- Move furniture and valuables away from the leak.
- If a ceiling is bulging or sagging with water, stay out from under it and keep people away. Water near light fixtures is an electrical hazard, so avoid that area and call a professional.
- Run a fan or dehumidifier to help the area dry.
- Take dated photos.
If more rain is coming and the roof is open or damaged, a roofer can install temporary protection. We explain that on our emergency roof tarp page.
What should I hand a roofer?
A short written summary helps more than most people realize. Include:
- Where inside the stain or drip is, and photos of it
- When it started and how it behaves (every rain, only with wind, only heavy rain, only after storms)
- The direction the wind came from during the worst leaks, if you noticed
- Photos of the attic and the exterior from the ground
- The age of the roof, if you know it, and past repairs
- What you did to contain the water
Frequently asked questions
Can I find a leak by spraying the roof with a hose? That means going on the roof, which we do not recommend, and it can point you to the wrong place. Leave water testing to professionals.
Why does the leak only show up in some storms? Wind-driven rain can push water to places that stay dry in calm rain. A leak in one storm direction tells a roofer which side to focus on.
Is dark staining always a current leak? No. Old stains can stay even after a leak stops. Look for damp insulation or wood in the attic to tell active water from old marks.
Should I use roofing sealant myself? Sealant applied in the wrong place can trap water or hide the real source. It also needs access to the roof. Have a roofer look first.
Is a leak covered by insurance? It depends on the policy and the cause. Policies differ, so read yours and ask your agent.
Talk to us about your roof
Total Roof Protection OKC can inspect your roof and explain what we see. Call 405-415-5841 to schedule an inspection. An inspection tells you about the roof. It does not predict or replace your insurer's decision. For more on what we look for, see what a roof leak looks like and our services.