Patch Lining
A short patch makes sense when the camera shows one local fracture or leaking joint and the pipe on either side is sound. There is little value in lining ten metres of good drain to repair one small measured defect.
When a patch repair can work
Typical patch jobs include one open joint admitting roots or a short fracture in an otherwise sound pipe. The repair still needs enough clear, reasonably shaped pipe for the patch to sit against.
The patch has to be put in exactly the right place
The repair material must be positioned over the actual defect. CCTV and measurement from a known chamber are therefore important parts of the job.
Some defects are too large or badly shaped for a patch
A severely displaced joint, crushed pipe or failed connection may need direct reconstruction instead.
Why a short patch has to cover the whole defect
A patch that sits a metre away from the defect repairs nothing, so measurement and camera positioning matter. Contractors may use markings on the camera cable, a locator sonde or fixed chamber measurements to place the patch over the exact section.
A patch is a targeted repair, not a cheaper version of lining the whole drain. It is best suited to one measured defect with sound pipe immediately before and after it.
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