Central Heating Pipes under screed

peabottle

Hello,

25mm flexible plastic conduit, inside lies 15mm JG SPEEDFIT barrier pipe,no fittings used under screed. The pipe as a 90deg bend,can you for see any problems/Issues.

Many thanks

FreeBear

Plastic pipe running under concrete - No issues at all. Standard practice if you are installing underfloor heating.

Boohoo

Why do you need 2 pipes?

I don't know about using 2 pipes but wouldn't 1 pipe be enough as it can be used under screed.

tacpot12

https://forums.moneysavingexpert.com/discussion/comment/82091706#Comment_82091706

One larger conduit containing the flow and return pipes would also be fine, but its much easier to install one pipe per one conduit. No problem with it. It's standard/best practice as per FreeBear's comment.

grumpy_codger

It's standard/best practice as per FreeBear's comment

He referred to underfloor heating practice that doesn't need any extra conduits - just a plastic pipe inside the screed. Generally, there's nothing wrong with using the same practice for a plastic pipe supplying normal radiators.

peabottle

Good morning,

Big thank you for all your input.

WIAWSNB

Although plastic pipe is nicely insulated compared to copper, it would still benefit from an additional insulation layer. This would also remove all pressure and potential movement from it. So an alternative method would be to wrap it in insulation before screening over.

Where is this screed layer - above or below the floor insulation layer? If below, then I'd definitely insulation-sleeve it.

But your own idea is more than fine in terms of protection. And if it's above the floor insulation layer, then any heat loss should end up in the room!

peabottle

Thank you for your reply, the 100mm insulation will be underneath the screed therefore okay, it’s a good point you make though.