Roots at the tap
Roots love the junction because it is a natural gap.
CIPP Pipe Lining
Lateral Connection (Top-Hat) Lining in Knoxville, TN
Seal the junction where your lateral meets the main so the whole system is watertight.
- DiggingAccess points only
- MethodCured in place
- ResultSeamless pipe within a pipe
Even a perfectly lined main and lateral can leak at the connection where they meet. That junction is a weak point, with an opening cut into the main and a joint that often shifts. A lateral connection liner, sometimes called a top-hat, forms a seamless, hat-shaped seal that reaches into the lateral and flares against the main. It closes the junction so roots, groundwater and sewage cannot pass through the joint.
We use a camera and a robotic launch to place the connection liner exactly at the junction, then cure it in place. It can pair with lateral lining or main lining for a complete watertight system. We assess the junction on video first, because some are so damaged that they need other repair, and we explain the options plainly.
When this is the right call
Leaks where lateral meets main
Camera video shows infiltration or exfiltration at the connection.
Offsets at the tap
A shifted lateral leaves a gap and a ledge.
After lining a main
Reinstated connections should be sealed to finish the job.
From first call to final video
- 01
Camera the junction
We record the lateral and the main at the connection.
- 02
Clean
Roots and debris are cleared from both pipes.
- 03
Position the liner
A launcher places the top-hat liner at the tap.
- 04
Cure
Heat or light hardens the liner against both pipes.
- 05
Verify
Video proves a clean, watertight junction.
Drag to compare.
Benefits that show up above ground
Completes the system
The connection is the last leak path to close.
Seamless seal
Liner flares into both pipes without gaps.
Trenchless
No digging at the street or main.
Pairs with other work
Ideal with lateral or main lining.
Lateral Connection Lining: answers
Is a top-hat the same as lateral lining?
No. Lateral lining covers the pipe, and a connection liner seals the junction with the main. They often work together.
Can you do this without a manhole?
We usually access the junction through a cleanout or manhole, depending on the layout.
Does the liner block the lateral?
No. The liner has an opening so flow continues.
What if the main is public?
We coordinate with the owner or utility as needed.
Often needed alongside this
Sewer Lateral LiningTrenchless lining for the lateral that links your home or building to the public sewer.Explore 
Lateral ReinstatementRobotic cutters reopen side connections after lining so every fixture drains like before.Explore 
Sewer Main LiningStructural lining for the larger sewer line that carries everything from your property out to t…Explore 
Trenchless Lateral ReplacementReplace the lateral from your home to the main with new pipe and minimal digging.Explore