Protective sleeve for sewage/wast pipes?

[patp]

In chatting to our, excellent, brickie he was telling us that the regulations state that underground pipes need wrapping in something like fibreglass insulation material. Does anyone know what this might be called. Mr Google does not seem to know.

[PeterW]

Is he talking about where a pipe goes through a foundation or a wall, that the pipe should be allowed to move..??

[patp]

Yes, that seems to be it.

[Conor]

You'd normally encase in concrete. Look up the Part N booklet. Polythene wraps are used to protect against chemical attack, unlikely you'd need that.

[PeterW]

If they are looking for a movement joint then you need to sleeve it properly or use a flexible coupling either side. What is the ground makeup..?

[Oz07]

Easier to post this than find the thread from anonymousbosch 

This is sleeved in 6" pipe but should be 8" if by the book. Stuff the gap with insulation and stainless steel scouring balls

[patp]

The ground varies. It is chalky with clay in places and the odd bit of sand.

 

Insulation was mentioned but he seemed to think his Civil Engineering boss used some sort of sleeve for ease of use.