Supply line in a finished wall
Pressurized water inside a wall. A split shows as a steady loss on the meter and a stain that spreads at the wall base. The test isolates the branch, and the opening is made at the nearest access point.
Serving Williamson County
Hidden Water Leak Detection in Franklin, TN
Finding a supply or drain leak inside a wall, floor or slab in Franklin with a meter test, thermal imaging and the smallest opening that will answer.
- Flooded basements
- Creek and storm water
- Burst lines and sump failures
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Leak Detection
Hidden Water Leak Detection: what it covers
Quick answer
A hidden leak is water leaving the plumbing where nobody can see it, inside a finished wall, beneath a floor or under a slab. In Franklin the common ones are supply lines inside finished walls and drains behind cabinets. Detection starts with a meter test, uses thermal imaging to show where the wall or floor runs cold or warm, and opens the smallest hole that answers the question. The repair is done by a plumber.
Most hidden leaks announce themselves slowly. A water bill creeps up, a floor feels warm in one corner, a stain appears on a baseboard, or a cabinet base swells at the back. In a house with finished walls, the first sign is often the damage rather than the leak, and the leak may have run for weeks before anyone looked. The purpose of detection is to say where water is leaving the system and to choose the least intrusive way to confirm it.
This page describes how that is done in Williamson County, what each test shows and what it does not, and how a detection visit ends. It is written for a homeowner who wants to know what will be opened, what will be left alone and who repairs the leak once it is found.
- Service area
- Franklin & Williamson County
- Availability
- Phones answered 24/7
- Phone
- (833) 490-5225
Warning signs
Signs you need hidden water leak detection
Openings in walls are made after the power to the area is checked, because a cable or a live circuit can run behind the finish. The homeowner does not cut into a wall alone. Gas lines are not opened in detection work; a smell of gas is reported to the gas utility from outside the house, and the household leaves the building first.
- A water meter that keeps moving when every fixture in the house is shut off
- A water bill that climbs without any change in use
- A warm patch on a floor, or a cool line across a floor that follows a pipe run
- A stain or a bubble in the paint at a wall, a baseboard or the ceiling below a bath
- A musty smell or damp carpet in one room, with no source in sight
Our process
How our hidden water leak detection visit works
Confirm with the meter
The meter is read with every fixture closed, then read again after a set interval. A change means water is leaving the system. A meter that holds still is also useful, because it points away from a supply leak and toward a drain or an outdoor line.
Survey the wall or floor with a thermal camera
A thermal camera is run across the room and along the wall where the leak is suspected. Cold or warm lines show the path of moving water or of a warm supply run. The camera does not see through the finish, so the image is a clue and not the answer.
Test the branches one at a time
Fixtures and branches are isolated in turn, with the meter or a pressure test, so that the leak is placed on one branch and not simply somewhere in the house.
Open the smallest hole that answers the question
A small opening is made where the test points, usually low in the wall or at an access panel. The hole is sized to see the pipe and no more, and it is placed where the trim or the cabinet will hide it.
Hand over the location and the plan
The homeowner receives the test results, the location of the leak, a photograph of the opening and a repair quote from the plumber. The repair and the closing of the wall are separate jobs, and the scope for each is written down.
What a thermal image can and cannot show
A thermal image shows temperature differences at the surface, and the leak is inferred from them.
Moving water is usually cooler than the surrounding material, and a supply line under pressure is often warmer where it runs close to a heated room. The camera records those differences as color, and a skilled reading turns them into a set of lines. The image cannot read a pipe through a thick finish, and a patch of cool wall may be a wet cavity, a cold outside wall or a bath that was recently used.
A thermal image is therefore compared with the meter test and the branch test. When all three point to the same place, the opening is made there. When they do not agree, the test is repeated before any wall is opened.
Questions to ask before the first opening
A short set of questions keeps the visit focused and the opening small.
- Which fixtures and appliances were running when the leak was first noticed?
- When did the water bill first rise, and by about how much?
- Is there a water heater, a sump or an outdoor hose connection on the same branch?
- Where are the access points, such as the crawl space door, the attic hatch or a closet panel?
- Which room has the strongest sign, and does the sign move from one room to another?
How the wall is closed afterwards
A hidden leak leaves a hole that has to be closed properly, and the closing is part of the job.
Once the plumber has made the repair and pressure-tested the line, the opening is closed with a patch board, taped, finished and painted to match the wall. A patch that is cut to a clean rectangle is easier to close than an irregular one, so the opening is made with that in mind.
The homeowner should ask whether the repair was inspected and whether a permit applied. The City of Franklin or Williamson County building department can confirm whether a permit is needed for the work on the property.
When the leak is under the slab
A leak under a slab is found by its effect on the floor, and the repair is planned around the feed.
A supply feed that runs under a slab is harder to reach, and the repair may need the slab opened or the line rerouted. The detection steps are the same: the meter first, then the readings across the floor, then the smallest opening that the readings allow. The water heater and the main feed are the usual places where a slab leak begins, so they are checked as part of the survey.
A slab repair is a bigger decision than a wall repair. The homeowner should expect a written scope, a plan for the floor covering and the drying, and a clear description of what will be opened.
What the homeowner keeps
The test record and the photographs are the proof of what was found and why.
The homeowner keeps the meter readings with their dates, the branch test results, the thermal images, the photograph of the opening and the plumber's repair invoice. Together they show where the leak was, how it was found and how it was fixed, and they are the first documents an insurer or a buyer will ask for.
A copy of each water bill from before and after the leak is also useful, since it shows the change the meter test confirmed.
Options
Types and options for hidden water leak detection
Drain line under a slab or a finished floor
Drains do not run under pressure, so the test uses a different check. A thermal survey and a camera run through the drain line show where the joint has failed or where roots have entered.
Line under a crawl space or lower floor
Water runs along the joists or the slab before it shows. The readings are taken on the joists and on the floor above, and the leak is found where the readings rise.
Williamson County
Why hidden water leak detection is different in Middle Tennessee
A supply line that runs through a tight wall cavity is opened in a closet or a hallway wall beside it, which keeps the finished room intact.
Where a leak is found in a wall that is also part of a claim, the photographs and the test record are kept before any repair starts.
The plumber should confirm the repair is done to code. The City of Franklin or Williamson County building department can say whether a permit applies to the property.
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Where we work
Hidden Water Leak Detection across Williamson County
- Leak Detection in Franklin
- Leak Detection in Brentwood
- Leak Detection in Thompson's Station
- Leak Detection in Nolensville
- Leak Detection in Forest Hills (Nashville)
- Leak Detection in Bellevue (Nashville)
- Leak Detection in College Grove
- Leak Detection in Green Hills (Nashville)
- Leak Detection in Arrington
- Leak Detection in Belle Meade (Nashville)
- Leak Detection in Spring Hill
- Leak Detection in Antioch (Nashville)
- Leak Detection in Hillsboro Village and Vanderbilt (Nashville)
- Leak Detection in Fairview
- Leak Detection in Berry Hill (Nashville)
- Leak Detection in Pegram
- Leak Detection in Downtown Nashville
- Leak Detection in Nashville 37210 (south)
- Leak Detection in Nashville 37217 (south-east)
- Leak Detection in Nashville 37222 (airport)
- Leak Detection in Nashville 37201 (downtown)
- Leak Detection in Nashville 37219 (downtown north)
- Leak Detection in Nashville 37213 (airport area)
- Leak Detection in Nashville 37208 (Germantown area)
- Leak Detection in Eagleville
- Leak Detection in La Vergne
- Leak Detection in Kingston Springs
Not sure if you're covered? Check your ZIP code.
Related
Related services
Burst Supply Line Damage
Cleanup after a pressurized supply line splits inside a wall, under a floor or above a ceiling in Franklin, Williamson County and the towns around them.
Flooded Basement Cleanup
Pumping, cutting back and drying a flooded lower level in Franklin and Williamson County, from a finished rec room to an unfinished storage bay.
Mold After Water Damage
Finding and removing mold that grew after water reached a Franklin home, once the moisture source has been stopped and the readings taken.
Ceiling and Drywall Water Damage
Wet ceiling board and wall drywall are cut back, the framing dried and the room read before paint or texture goes on.
Guides
Read before you book
Where Water Hides in a Finished Basement in Franklin
A finished basement in a newer subdivision house has carpet, drywall, built-in storage and sometimes a bath or a wet bar.
Choosing a Water Restoration Company in Franklin
A water damage company should be able to explain its method, its credentials, its insurance and its written estimate before work begins.
FAQ
Hidden Water Leak Detection FAQs
What does a meter test prove?
It shows whether water is leaving the system. It does not show where. The location is found by isolating the branches and reading the thermal survey, and the two are read together.
Do I have to be home for the test?
Usually the homeowner or an adult representative is present to show the fixtures and agree the opening. The meter test can be run while the house is in normal use with the water shut off at the right points.
Can the drain be checked without digging?
Often, with a camera. A camera run through the drain shows cracks, root entry or a separated joint. The camera does not reach every bend, and where it cannot, the check is repeated another way.
Is detection the same as the repair?
No. Detection finds and confirms the leak, and the repair is done by a plumber. Ask the plumber for the scope and the invoice before the work is agreed.