For more than 30 years, pitch fibre has not been allowed to be installed but they are still very common in older properties.
The lifetime of pitch fibre pipes is estimated to be around 40 years due to the delamination of the pipes.
The delamination process can take a long time but increases aggressiveness when high temperatures or chemicals are used. When the pipe becomes delaminated it can cause blockages and cost a lot of money to repair. In only 3-4 months after the pipe has become delaminated a deformity in the pipe could change from a 20% difference to an 80% difference.
If your property has pitch fibre drains in good condition it would be financially beneficial to have them relined to slow down the delamination process.
Another deformation that could occur in a pitch fibre pipe is ovalling. This is caused by the overhead ground pushing down on the pipe causing it to slightly flatten creating a oval.
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Problems that can occur when pitch fibre pipes are used for foul drainage:
- Through poor instilation, age or weight stress pitch fibre can deteriorate
- Pitch fibre pipe can become permeable, allowing water to seap out. This causes the subsoil to wash away which could result in subsidence
- A leaking pipe can attract plant roots, which then break through the pipe causing further damage
- Pitch fibre pipes are prone to internal damage which could eventually result in closing the pipe
Some companies use powerful jets of water on the pitch fibre pipes which cause additional damage due to the harshness of the impact.
Only 2 uses of these jets could delaminate your pipes whatever the condition was before. You should watch out for companies who offer a ‘contract insurance plan’
Re-forming a pitch fibre pipe
When a pipe is deformed in any way, our specially developed, ‘re-rounder’ is able to reform ovalled pipes and remove blistering.
With multiple uses, the re-rounder is able to force the pipe back into its original shape before clean water is used to flush out any deposits left behind. Finally our professional engineers install a cured-in-place pipe (CCIP) and impregnated it with either polyester, silicate or epoxy resin. The use of the re-rounder allows the pipe to be fixed without costly excavation or the removal of manholes.