Does alkathene need to be sleeved when under concrete?

[teaboyjim]

Does the pipe need to be sleeved?

 

[oldbutnotdead]

Its a good idea to sleeve it- means any thermal expansion/contraction of the pipe is free to happen, plus makes pulling a replacement bit through (if you ever needed to) much less disruptive. Chemically don't think its a problem.

 

[bernardgreen]

The sleeve adds a layer of mechanical protection to prevent ( reduce the risk of ) the pipe being punctured by sharp stones

 

[teaboyjim]

Its a good idea to sleeve it- means any thermal expansion/contraction of the pipe is free to happen, plus makes pulling a replacement bit through (if you ever needed to) much less disruptive. Chemically don't think its a problem.

Is there any regulations that cover this do you know?

 

[teaboyjim]

The sleeve adds a layer of mechanical protection to prevent ( reduce the risk of ) the pipe being punctured by sharp stones

That makes sense

 

[denso13]

Does blue alkathene that's put in underneath a slab of concrete does the pipe need to be sleeved or doesn't it matter?

If it is mains water then it has to be in a purpose made duct or chase. Sleeving alone is not enough.

https://www.wras.co.uk/downloads/pu...lets/para_7_guidance_version_2_july_2014.pdf/