Pitch Fibre Pipe Repair & Re-Rounding
Across Sunderland
Certified no-dig trenchless solutions to resolve blistered and deformed pitch fibre drainage.

Pitch fibre was widely used in post-war construction as a lightweight, flexible alternative to traditional clay pipes. These pipes were constructed from wood pulp impregnated with coal tar pitch, a material that was never designed for the longevity required of modern drainage. Over time, the internal walls of these pipes begin to soften and delaminate, creating blisters that snag debris and cause frequent blockages. As ground pressure increases or the material loses its structural binder, the circular pipe deforms into an oval shape, further restricting flow and eventually leading to a complete structural collapse.

Before any repair begins, we conduct a high-definition CCTV drain survey to assess the extent of the deformation. Our WJA-certified engineers then follow a strict, multi-stage restoration process. First, we use carefully calibrated high-pressure water jetting to clear scale and silt while avoiding further stripping of the damaged internal layers. Once the line is clean, we deploy mechanical re-rounding tools to restore the original bore of the pipe. Finally, we install a structural CIPP (Cured-In-Place Pipe) resin liner. This creates a new, rigid pipe within the existing structure, providing a smooth, hydraulically efficient surface that is resistant to future root ingress and ground movement.

Traditional excavation requires digging trenches through driveways, lawns, or back-lane access points to reach the damaged pipework, often resulting in significant secondary costs to repair surfacing and landscaping. Our no-dig approach eliminates this disruption entirely. By using resin-based structural liners, we can complete repairs in a fraction of the time, often within a single day. This method is particularly vital for the tightly packed Victorian terraces in Millfield or Hendon and the 1950s suburban semis in areas like High Barnes and Fulwell, where physical space for heavy plant machinery is limited.

Can all pitch fibre pipes be repaired without digging? If the pipe has not fully collapsed, it is usually a candidate for our re-rounding and lining process. We typically see successful results with up to 40% deformation. How long does a resin liner last? A properly installed structural liner is designed to perform like a new pipe, with a service life exceeding 50 years. Will my insurance cover the cost? While many insurers classify pitch fibre failure as wear and tear, we provide the technical reports and high-definition CCTV evidence required to support your case for a potential claim or ombudsman appeal. Recurring blockages in your Sunderland home? Contact our technical team on 0191 743 0455 for a specialist pitch fibre assessment.