Many homes across Salisbury — particularly those built between the 1950s and 1970s — were constructed using pitch fibre drainage systems. At the time, they were seen as a lightweight, cost-effective alternative to traditional clay pipes.
Fast forward several decades, and these ageing systems are now a leading cause of blocked drains in Salisbury — often due to structural collapse, deformation, or root intrusion.
At Salisbury Drains24, we’re experts in diagnosing and repairing problems with pitch fibre drains. In this post, we’ll explain what they are, the common issues they cause, and the repair options available.
What Are Pitch Fibre Drains?
Pitch fibre pipes are made from cellulose and impregnated with tar-like bitumen, giving them a lightweight but flexible structure. They were commonly installed in post-war housing developments due to lower material costs and ease of installation.
However, over time, pitch fibre deteriorates — becoming soft, blistered, or deformed under pressure or when exposed to chemicals. That makes them vulnerable to collapse, particularly in high-use or root-prone areas.
Common Problems with Pitch Fibre Drainage
We frequently uncover damaged pitch fibre pipework during CCTV inspections across areas like Wilton, Laverstock, and Bishopdown. Here are the most common issues:
- Pipe Collapse – The pipe softens and flattens, restricting flow or fully blocking the line.
- Deformation and Blistering – Internal layers delaminate, causing water to pool and debris to catch.
- Root Intrusion – Tree roots exploit the weak joints and soft structure, breaking through and expanding inside.
- Frequent Blockages – Even if the pipe hasn’t collapsed, deformation can cause repeated blockages and slow drainage.
If you’ve had repeated drain blockages in Salisbury, particularly in an older property, failing pitch fibre pipes may be the cause.
Signs You May Have a Collapsed Drain
- Persistent slow-draining toilets or sinks
- Recurring backups, even after previous unblocking
- Gurgling sounds or foul odours
- Water pooling in the garden near manholes
- Cracks or sinkholes around the property
A collapsed or deformed pipe isn’t just an inconvenience — it can lead to long-term property damage, subsidence, and health risks if left untreated.
Repair Options for Pitch Fibre Drains
At Drains24 Salisbury, we offer multiple solutions depending on the severity and location of the damage:
🔍 CCTV Drain Survey
First, we conduct a full camera inspection to identify the condition of your drainage system and pinpoint the problem.
🧰 Pipe Relining
For pipes that are deformed but not fully collapsed, structural lining (also known as CIPP – Cured-In-Place Pipe) can restore function without excavation. A resin liner is inserted and cured in place to create a new pipe within the old one.
🔪 Pipe Cutting & Reforming
In some cases, we can reform the pitch fibre pipe using specialist cutting heads and re-rounding tools before relining.
🕳️ Excavation & Replacement
If the pipe is too far gone, we can excavate the damaged section and replace it with modern, long-lasting uPVC pipework. This is often the best long-term solution for collapsed sections or areas under high strain.
Why Choose Drains24 Salisbury?
✅ Local drainage experts with experience across Salisbury and surrounding villages
✅ WJA-certified engineers for safe, high-pressure jetting
✅ N.A.D.C.-approved CCTV surveyors
✅ Transparent pricing and no call-out fees
✅ All work fully guaranteed
From routine inspections to full system replacements, we’re here to deliver reliable, cost-effective drain services in Salisbury.
Suspect a Pitch Fibre Problem? Call Drains24 Today
If you’re experiencing slow drains or recurring blockages, especially in an older property, pitch fibre drains could be the root of the issue. Don’t wait until the system collapses.
📞 Contact Salisbury Drains24 today for a CCTV inspection or a free quote on drainage repair.
