On this page
- Why leaks are so hard to find
- How roofers find the source
- What a good leak inspection should leave you with
- Is it the roof, plumbing or the AC?
- Signs your roof may leak before you see a stain
- What does leak detection cost?
- Questions to ask before they climb up
- Roof leak detection questions
- More roof leak help in Valrico
- Keep reading
- Sources
A good roofer traces a leak from the attic, checks penetrations and flashing, and sometimes runs a water test. The stain is rarely under the hole. According to Roofing Contractor's 2026 homeowner survey, most roofing contractors don't charge to assess a roof, but ask first.
Why leaks are so hard to find
Water doesn't drip straight down. It follows the roof deck, a rafter or a nail, soaks into insulation and finally shows up where the ceiling is weakest. Wind-driven rain makes it worse. A leak that only appears when rain comes from the west won't show up on a calm day. That's why the ceiling stain is a clue, not the answer.
How roofers find the source
- Attic inspection. Look for wet decking, dark stains, damp insulation, daylight and rusty nail tips. Follow the trail uphill from the stain.
- Roof surface check. Inspect shingles or tile, valleys, ridges, seams and fasteners above the wet spot.
- Penetrations and flashing. Plumbing vents, exhaust fans, chimneys, skylights and wall joints cause a large share of leaks.
- Moisture meter. A handheld meter helps confirm which materials are wet and how far it spreads.
- Thermal imaging. Some roofers use infrared cameras to spot wet insulation or deck. It's a clue, not proof, and works best with other checks.
- Controlled water test. With a helper inside, a roofer runs a hose over one small section at a time, working uphill, until the leak shows. This pins down the entry point without waiting for rain.
Not every roofer uses every method. Ask which ones they plan to use and what they'll show you.
What a good leak inspection should leave you with
- Photos of the leak path and the damaged area, not just a verbal explanation
- A plain description of the cause and what repair fits it
- A written quote with the scope and price
- A note of any other problems they saw, such as worn flashing or damaged decking
- An honest answer on whether a repair will hold or the roof is near the end of its life
If you plan to file an insurance claim, a written report from a roofer helps document the cause. Our guide on whether homeowners insurance covers a roof leak explains why the cause matters.
Is it the roof, plumbing or the AC?
Not every ceiling stain comes from the roof. These rules of thumb help, but a pro should confirm:
| What you notice | Likely source |
|---|---|
| Appears only after rain, worse in wind-driven rain | Roof, flashing or a vent |
| Drips in dry weather, or steadily | Plumbing or an HVAC line |
| Wet spot under a bathroom or kitchen | Plumbing |
| Wet near the air handler or a drain line | AC condensate drain or pan |
| Damp attic, no clear drip, humid days | Condensation or poor ventilation |
Signs your roof may leak before you see a stain
- Granules from shingles collecting in gutters or at downspouts
- Curled, cracked or missing shingles, or slipped or broken tiles
- Rusted or lifted flashing and cracked rubber vent boots
- Daylight through the roof boards in the attic
- A musty smell, or mold in the attic
- Bubbling or peeling paint on a ceiling or wall
Hot, humid climates age roofing materials faster, and rain-then-sun cycles wear on sealants and flashing. A Tampa Bay inspection company notes that most leaks begin at roof penetrations long before they become visible indoors.
What does leak detection cost?
Many roofers assess a roof at no charge, according to Roofing Contractor's 2026 survey, but that isn't universal. Ask whether there's a fee, what it covers and whether it's credited toward the repair. For context, Angi puts typical Tampa roof repairs at $463 to $1,589. More on pricing in our cost guide.
Questions to ask before they climb up
- Is there a charge for the inspection, and is it credited if I hire you?
- Which methods will you use to find the source?
- Will you show me photos of what you find?
- If you can't find the leak on the first visit, what happens next?
- Can you give me the findings in writing?
Roof leak detection questions
Can a roofer find a leak when it isn't raining?
Often, yes. Attic evidence, moisture readings and a controlled water test can recreate the problem. A roofer doesn't have to wait for rain.
Will a thermal camera always find the leak?
No. It can show wet insulation or temperature differences, but it's one tool among several. A roofer still needs to confirm the entry point.
What if the roofer can't find the leak?
It happens, especially with wind-driven leaks. Ask what they'd try next, such as a longer water test, and whether they charge for return visits.
Do I need attic access for a leak inspection?
It helps a lot. If you can't get into the attic, say so when you call and ask how the roofer plans to trace the leak.
Is leak detection covered by insurance?
Your insurer decides, and coverage depends on the cause of the loss. A written roofer's report can help document that cause if you file a claim.