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How Deep Are Pitch Fibre Drains Buried?

Home — Blog — How Deep Are Pitch Fibre Drains Buried?

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Pitch fibre drains became popular in the UK during the 1950s to 1970s. Builders liked them because they were cheap and light. Homeowners liked them because they cut costs and saved time during construction.

Today, many homes still rely on these old pipes. The problem is that pitch fibre does not last well underground. One common question from homeowners is simple: how deep are pitch fibre drains buried? Let’s explore the answer and why depth matters.

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What Are Pitch Fibre Drains?

Manufacturers created pitch fibre by mixing wood cellulose with tar-like bitumen. The result was a lightweight, flexible, and cheap pipe. Builders could install it quickly without heavy machinery.

At the time, pitch fibre looked like progress. Now, we know better. These pipes weaken underground. They can bend, blister, and collapse after years of pressure.

The depth of installation plays a big role in how long the pipes survive. Shallow pipes face more stress and usually fail first.

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Typical Depth of Pitch Fibre Drains

Most homes with pitch fibre drains have them buried 600mm to 1200mm deep (2 to 4 feet). Depth varies depending on soil and property design.

  • Shallow drains (600mm / 2 feet): Builders often used this depth in smaller houses or extensions. These drains fail faster under pressure.

  • Standard drains (750mm – 1200mm / 2.5 to 4 feet): This depth was most common. It balanced safety with ease of installation.

  • Deep drains (over 1200mm): Builders only used this depth when homes needed to reach deeper sewer mains.

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Common Problems with Pitch Fibre Drains

Depth does not remove the weaknesses of pitch fibre. Homeowners often face these problems:

  • Pipes crush and flatten under soil.

  • Layers peel apart and leak water.

  • Heat creates blisters that block flow.

  • Roots break in through cracks.

  • Complete collapse in severe cases.

Shallow drains usually fail sooner because they face more stress.

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How Depth Affects Repair or Replacement

Depth affects the repair strategy. Here’s what usually happens:

  • Shallow drains: Easy to dig up but often too damaged to save. Full replacement is common.

  • Standard drains: May allow relining if damage is not severe. No-dig solutions can help here.

  • Deep drains: Often last longer but cost more to repair. Excavation takes more time and equipment.

Specialists now prefer no-dig methods. These options reduce cost and disruption for homeowners. But if the pipe has collapsed, digging remains the only option.

Signs Your Pitch Fibre Drains Might Be Failing

Worried about your drains? Look for these warning signs:

  • Frequent blockages that keep returning.

  • Sinks or toilets that drain slowly.

  • Gurgling noises in the system.

  • Sewage smells in the garden.

  • Ground that sinks or feels soft.

  • Water backing up after heavy rain.

If you see these issues, book a CCTV survey. A survey shows the depth, material, and condition of your drains.

What To Do if You Have Pitch Fibre Drains

Follow these steps if you discover pitch fibre drains:

  1. Book a professional survey. This will confirm the depth and condition.

  2. Check compliance with modern rules. Shallow drains may need upgrading.

  3. Ask about repairs. Relining may help if pipes are not collapsed.

  4. Plan for replacement. Many shallow drains cannot be saved.

  5. Act quickly. Early action prevents costly emergencies later.

Final Thoughts

So, how deep are pitch fibre drains buried? Most sit 2 to 4 feet underground. That depth may seem safe, but pitch fibre’s weakness makes it unreliable.

Shallow pipes are often worse, but even deep ones will not last forever. If your home was built between 1950 and 1979, check your drains. Knowing their depth and condition will help you plan the right repair or replacement.

At Pitch Fibre Specialists, we inspect, repair, and replace old pitch fibre drains across the UK. Our experts use modern no-dig technology where possible. We always give clear, honest advice.

Contact Pitch Fibre Specialists today for a free consultation. Protect your home with reliable drainage that lasts.

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