Property renovation, re-plumb advice req`d

[Best]

but there is nothing wrong with running into the room in 22mm then into a manifold and split from there for the various appliances ie in bathroom behind the bath, then all you have to do is whip off the bath panel to isolate every appliance individually??

I would be more than happy with each bathroom having it's own isolating valve but take your point. I think any main isolators should be somewhere handy & all labeled as to where they feed.

 

[Steve]

Just need to come off stopcock in 22mm & keep going to each main point in 22mm, then tee down to 15mm to small supplies like toilets & basins.

If I come off the stopcock with 22mm and then split 3 ways wil that not defeat the object of trying to reduce pressure drops?

I was thinking: mdpe (25mm) - stopcock - short 25mm pipe to manifold (25mm in and 3x 22mm outlets) ???

 

[Koogatubac]

Why do you not
View attachment 9280

Is that picture on a 3 bed end terrace property?
I meant i havnt seen a manifold on a 3 bed end terrance property mate

 

[Gray0689]

No mate it's not lol
But no reason it can't be very simple to do and yes will be more expensive in short term but on heating side will be better in long term imho

 

[Best]

If I come off the stopcock with 22mm and then split 3 ways wil that not defeat the object of trying to reduce pressure drops?

I was thinking: mdpe (25mm) - stopcock - short 25mm pipe to manifold (25mm in and 3x 22mm outlets) ???

I know what you are thinking, but to use 25mm pipe to the manifold will make no difference to the flow rates. 25mm is much the same as 22mm copper.

 

[Koogatubac]

No mate it's not lol
But no reason it can't be very simple to do and yes will be more expensive in short term but on heating side will be better in long term imho

🙂 you've done cold water distrubution pipes on manifolds have you mate?

Heating via manifolds like that (UFH?) i prefer than radiators 🙂

 

[Gray0689]

🙂 you've done cold water distrubution pipes on manifolds have you mate?

Heating via manifolds like that (UFH?) i prefer than radiators 🙂

Yes mate if you look at that picture the ones in bottom right corner are domestic hot and cold manifolds
The rest are to the radiators
no underfloor heating

 

[JCplumb]

I think that this is being over cooked somewhat. This is a 3 bed terrace not a block of flats🙂 Use copper as it's less likely to fail especially if you're hiding it under tiled floors etc. Plastic is good and reliable but ONLY if done right. Whereas if your copper installation isn't leaking on day one, it probably won't be leaking on day 10,000.
15mm everywhere will be fine for hot and cold runs if your incoming main has decent pressure and you're installing a combi/sealed system, manifolds to supply a bathroom are overkill IMO, use ISO's to isolate units. The only reason I would think manifolds were first mentioned is because someone has been looking through the John Guest brochure and thought 'ooh that'll work'

 

[Gray0689]

I think that this is being over cooked somewhat. This is a 3 bed terrace not a block of flats🙂 Use copper as it's less likely to fail especially if you're hiding it under tiled floors etc. Plastic is good and reliable but ONLY if done right. Whereas if your copper installation isn't leaking on day one, it probably won't be leaking on day 10,000.
15mm everywhere will be fine for hot and cold runs if your incoming main has decent pressure and you're installing a combi/sealed system, manifolds to supply a bathroom are overkill IMO, use ISO's to isolate units. The only reason I would think manifolds were first mentioned is because someone has been looking through the John Guest brochure and thought 'ooh that'll work'

Nothing is overkill if someone wants it done lol

 

[Koogatubac]

Good work grey 🙂

 

[Nostrum]

Sounds like you may be over engineering a simple 3 bed semi re-plumb to me, I take it your going for an unvented cylinder and thermostatic showers in multiple bathrooms etc? Or are you trying to peel your spuds with water pressure in the kitchen sink :tongue3:.

It's all going to be relative to the spec of the rest of the house as to whether or not it is worth doing something like this.

 

[markfxy]

If youre fitting a combi theres no point running 22mm just do it all in 15mm use push fit it's quicker and easier done properly pushfits fine, if youre not a plumber your more likely to get a leak with copper

 

[plum ber]

I think that this is being over cooked somewhat. This is a 3 bed terrace not a block of flats🙂
someone has been looking through the John Guest brochure and thought 'ooh that'll work'

You could be right there with the overcooked part but I have used a manifold in a bathroom before and it worked really well but it was a complete bathroom room swap the lot. So the boss ordered manifold's to be used instead of iso valves.....will put a pic on if I can but I will say it was one of the first jobs I did and was bent using a spring not a bending machine.

 

[gavinwilson]

Would it not be worth finding out what your pressure is coming into the house and then working out what it will be with new bathrooms/ proposed pipework runs then you can work out what you can get away with why spend money if you don't need to ?

sent from my annoying box

 

[Koogatubac]

3 bed end terrace ant gunna be that big. Just sufficient to put a combi say worcester 40 in, could run up to 1x bathroom, 1x en-suite, 1x kitchen.

Re-do all plumbing either way. Plastic or copper depending on budget and time.

New bathroom and heating system. Jobs a gud en! Easy peasy

 

[stevetheplumber]

when we were doing flat conversions we often brought the main in under the bath and took seperate runs out to basin wc and kitchen if it was a small bathroom we would do the basin and wc in 10mm by doing it that way theres no joiints under the floors just clip it well