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PostPosted: Thu Jul 06, 2017 12:27 pm 
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For my new extension (kitchen/diner and utility room) we have concrete beams (30cm from ground as house is on a slope) and then 150mm insulation on top and then 75mm screed. There will be new piping for the utilities and dishwasher and shower etc which will run in the void under the beams and then up through the insulation and screed to its desired location.

I want to help avoid any issues down the line as it will not be simple to fix any leaks etc. My builder is suggesting to use polypipe instead of copper but he said the choice is for me. What would you recommend? I believe that the cost of poypipe with connectors is similar to copper. is this correct ? And is polypipe stronger and better to use nowadays?


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PostPosted: Thu Jul 06, 2017 12:53 pm 
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Using plastic will mean there are no joints under the floor/void.

Perhaps using plastic in a plastic conduit would enable the plastic pipes to be pulled out and replaced, if necessary, at a later date.

Personally I would use plastic in this scenario.

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PostPosted: Thu Jul 06, 2017 3:03 pm 
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gas4you wrote:
Perhaps using plastic in a plastic conduit would enable the plastic pipes to be pulled out and replaced


But would that not make it even more costly than copper? And if its a pipe in a pipe, and the inner pipe leaks where will the water go?

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PostPosted: Thu Jul 06, 2017 11:50 pm 
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It doesn't *really* matter either way because, plastic or copper, if it's fitted correctly and pressure tested, it will never leak. The only time there should be an issue is if someone puts a drill bit or a nail through it.

Pipe in conduit is an interesting idea, although once you factor in tees and elbows I don't know how feasible it would end up being to pull new pipe through. Worth thinking about though.

If it was my choice, I'd do it in copper because I prefer working with copper. But I'd happily do it in plastic if someone asked for it. Buteline seems worthy of a mention for this sort of thing... never used it but watched a few vids and I'm interested in giving it a go at some point.

A mate of mine bought a house that was almost completely piped up (hot & cold, and CH flow and return) in speedfit. Not a single insert in any fitting! One of them popped off in the kitchen after a few months (fortunately he was in at the time and shut the water off before it did any real damage). I ended up lifting floorboards in every room in the house and redoing the lot! That is not to say anything against speedit or similar systems -- it's getting to the age now where you can pretty much say it's standing the test of time. That was entirely the fault of whoever fitted it.

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PostPosted: Fri Jul 07, 2017 8:08 am 
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chrrris wrote:
Pipe in conduit is an interesting idea, although once you factor in tees and elbows I don't know how feasible it would end up being to pull new pipe through. Worth thinking about though.


That the point.

No joints under the floor, only where it comes out above the floor.

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PostPosted: Fri Jul 07, 2017 4:42 pm 
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Oh, I see what you mean. Sorry - I got the wrong end of the stick there!

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PostPosted: Fri Jul 07, 2017 8:37 pm 
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In the first post the OP mentioned "which will run in the void under the beams", so I would definitely go for [continuous] 'plastic'. :wink:


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PostPosted: Tue Jul 11, 2017 5:30 pm 
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Thank you so much everyone. Polypipe it is


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