What is pitch fibre?
Pitch fibre is a pipe made from wood pulp or paper soaked in bitumen. Builders used it widely in post-war housing, as a cheaper and lighter option than clay. Sources differ on exact dates, but it was common from the 1950s into the 1970s.
Unlike clay, it can soften and change shape over time. For that reason, many older drains of this type are now worn. A camera survey can confirm what you have.
How to identify pitch fibre on CCTV
On camera, pitch fibre often looks dull and dark. The pipe may look oval instead of round. The inner surface may peel in layers.
You cannot tell from the surface of the ground. Therefore, a camera survey is the best way to know. Ask the surveyor to say what pipe material they see.
Why pitch fibre fails
Water and soil pressure can soften the pipe wall. The pipe may then flatten into an oval shape and trap debris. Joints can also slip.
Roots and ground movement make this worse, because they add force to a weak pipe. Repeated blockages are an early sign.
What to do if you have pitch fibre pipes
First, get a camera survey so you know the condition. If the pipe is only mildly out of shape, relining may help. If it has collapsed, you may need to dig it up.
Ask for repair options in writing. Our guide to pitch fibre warning signs helps you spot trouble, and you can ask for a free quote on our site.
Cost comparison
Relining and excavation differ in cost, and both depend on length, depth and access. Relining often costs less when the pipe is still in good shape. However, a collapsed pipe needs digging.
We cannot give fixed prices, because each job differs. Compare written quotes that list the work.
Pitch fibre and house purchase
If you plan to buy a home from the right era, ask for a drain survey. It may reveal pitch fibre before you commit. A faulty drain can be costly, so the information is useful.
Share the report with your solicitor. You may use it to talk about the price or to ask for repairs.
Does my lender care about pitch fibre?
Lenders have their own rules. Some may ask about drains, while others do not. Ask your lender or broker what they need.
Do not assume anything, since policies change. A survey report gives you facts to share.
Related guides and local help
If you want to know more, read UK Property Drainage History: How Home Age Affects Risk. You can also read Drainage Guide for New Build Buyers: What to Check First and Victorian and Edwardian Drainage: Common Problems to Expect, because they cover closely related problems.
These guides help too: Why You Need a Drain Survey When Buying a House in the UK, When to Replace Drain Pipes: Signs, Lifespan and What to Do, CCTV Drain Survey for Commercial Property: What to Expect, Boiler Pressure: Normal Range, Low Fixes and High Pressure and Drain Relining (CIPP): How It Works, When It Helps and Cost. Each one explains a related topic in plain English.
Need help near you? Read our CCTV drain survey page first, or see CCTV Survey in Accrington and CCTV Survey in Airdrie. You can also see Blocked Drains in Buckingham, since every service page has a free quote form. We pass each request to a local drainage engineer.
