Isolation valve installation advice for bathroom

benson1980

Hi all, 

I'm planning on ripping out my bathroom suite this week and starting renovations (new suite, tiling etc). For the toilet and sink I have isolation valves already installed so no issues there I believe....just isolate and remove. Then was going to connect up the new toilet and sink using flexi pipes.

With the bath I have 22mm copper pipes with no isolation valves. I therefore bough some pipe cutters, and a couple of these...

https://www.screwfix.com/p/full-bore-isolating-valve-22mm/43961#_=p

However (to be honest prompted by reading Bendy's input on the other plumbing related thread regarding needing flat faced valves) have I made an error and should I get 22mm isolating flexi pipes so I am all ready to go, and no issues attaching flexi to the compression fittings? i.e. would a couple of these would be better, or the flat faced valves:

https://www.screwfix.com/p/flexible-hose-with-valve-22mm-x-x-500mm/9397g

The plan is to remove everything, remove tiles, replaster etc so these connections would just be left until ready to install new stuff if that makes sense.

Apols if this is obvious but just want to check I'm not messing anything up before embarking.

Thanks

Bendy_House

Eek! Hi Benson. 
What type of hot water system do you have, combi, or vented or unvented cylinder?
These '22mm' flexis have much smaller internal bores, that example being less than 15mm. This *could* affect the flow rate if it's from a vented cylinder.

Sorry - another potential complication :-(

benson1980

Bendy_House said:

Eek! Hi Benson. 
What type of hot water system do you have, combi, or vented or unvented cylinder?
These '22mm' flexis have much smaller internal bores, that example being less than 15mm. This *could* affect the flow rate if it's from a vented cylinder.

Sorry - another potential complication :-(

It is vented/gravity fed, hence why I probably went for the full bore isolation valve. Didn't think about that for flexi bore....from doing a quick google it looks like you can get full bore flexi. Is a better option perhaps to get a couple of 22mm compression fit caps just to cap off the pipes whilst I renovate, then when ready to go connect it all back up with 22mm full bore flexi, such as this?

https://www.amazon.co.uk/Flexible-Connector-22MM-Large-300mm/dp/B00NW507AS/ref=sr_1_4?adgrpid=120329646438&gclid=CjwKCAjwrqqSBhBbEiwAlQeqGmPjl60lPYeuxRLlfbUaNc6ZAnXKHgk0fN8J6mzRoANCmGiRuuGcLRoCBOEQAvD_BwE&hvadid=506859731457&hvdev=c&hvlocphy=1007203&hvnetw=g&hvqmt=e&hvrand=15737149012223299002&hvtargid=kwd-503808844470&hydadcr=26607_1930977&keywords=22mm+full+bore+flexible+hose&qid=1649104446&sr=8-4

Bendy_House

These full bore flexis look a much safer bet, then. No harm using them in conjunction with full bore isolators - when the time comes (hopefully in well over a decade!) that you need to service or change the bath taps, you'll be glad.
You can also get flexible COPPER tails, which should be as long lasting as all your pipework, if you fancy an alternative.
See what plumbers on here have to say?

benson1980

Bendy_House said:

These full bore flexis look a much safer bet, then. No harm using them in conjunction with full bore isolators - when the time comes (hopefully in well over a decade!) that you need to service or change the bath taps, you'll be glad.
You can also get flexible COPPER tails, which should be as long lasting as all your pipework, if you fancy an alternative.
See what plumbers on here have to say?

Ok thank you. Spoke to a plumbers merchant today and they confirmed 22mm full bore flexi is the easiest way to go after I install my isolation valves. It’s an order in item rather than off the shelf though. 

Thanks for your input- would have probably missed the importance of keeping it all full bore.