Pipework in Floating floor insulation

[norris309]

Hi All,
After some opinions/advice

I've had a small ground floor extension built, which is a small store with an 'office' & downstairs WC.
Currently the floor is just the Concrete slab so needs making up with PIR boards & 22mm chipboard to the correct level.

The bit I'm struggling to get my head around is the best way to run pipe work for 2 radiators (1 in the 'office' space and 1 in the WC) and also the hot & cold water pipes for the WC.
From what I've read, you ideally need to keep joints accessible, so I think I should be able to achieve this for the hot & cold, by running them in plastic to the stud wall of the wc which could have a covered access panel (a thought anyway - or would you forget an access panel as it'll only be behind plasterboard anyway & cut a panel if ever needed??)

But the pipework, can it literally be chased into the top of the PIR and ran to the locations needed and then the chipboard placed over the top? are there such things as clips to hold the pipe to stop any movement?

Or maybe fix the pipework to the concrete before insulation, then wrap them in something before covering with PIR & then have the pipes poking up vertically through the PIR (thus leaving you with inaccessible 90 degree bends)

I am awaiting a visit from a plumber to quote for what i need doing, but just like to get some ideas in my head to compare with what i get told is best.. if you know what i mean.

Cheers

 

[ETAF]

JUST A DIYer - so may not be best practice - and sure you will get other more professional opinions

A recent cloakroom refresh

Added a radiator - Hot & cold water to basin and cold to toilet - hot/cold and CH from the loft (bungalow) down the wall (each side of a door jam ) and then along the floor - so lots of 90degree bends needed in the 4 pipes

i used John Guest piping that was flexible and used a 90 degree former ( which i screwed to the wall as it had a slot for that ) to minimise all the joints needed - for the runs i keep close / under a small channel in the wall and filled with kiln dried sand ,not sure if this was a good idea, but the CH in the rest of the suspended floor had sand - I had a load of kiln dried available
and its just the CH uptail to the radiator that has a right angle joint , which i also added white clips to lock the connector - everything else is using the 90degree formers and then accessible

The site i used has been taken over - so no idea on the quality or service now

Pipe
This was John Guest 15mm and was the flexible Version which could be bent 90 degree OK
layflat

John Guest Speedfit Polybutylene Layflat Pipe - 15mm x 25m | Plumbing Superstore®

The JG Speedfit Layflat Polybutylene barrier pipe has even greater flexibility making the system very easy to handle and ...

www.plumbingsuperstore.co.uk

wow have prices gone up

90 degree former

John Guest Speedfit Cold Forming Bend - 15mm | Plumbing Superstore®

To form a tighter fixed bend than plastic pipes allow when unsupported, this John Guest Speedfit cold forming bend is the perfect option. Rather than fiddli...

www.plumbingsuperstore.co.uk