Advice planning new bathroom layout

[tcarnell]

Hi all,

As a competent DIYer I've decided to undertake the task of renovating the bathroom in our house. Since I want to move the bath and WC within the room so that you can shower in the bath without soaking the window, I've decided to replace the whole cast iron soil system as well.
I realise this will be a big task but I feel up to the challenge and the end result will hopefully be reward enough.

Anyway, at present the bathroom uses a two-pipe system with the basin and bath having wastes separate from the soil pipe, but I wish to replace it with a single-stack system.
I have designed the new layout and it's viewable at [DLMURL]http://www.fluvius.co.uk/bathroom/Proposed_Layout.jpg[/DLMURL]

I'm asking if those 'in the know' could cast their eyes over it and highlight any problems, pitfalls, or offer any advice.

I did read somewhere (and I quote) "it is necessary with single-stack systems to avoid one appliance siphoning the trap of another, and also avoid the possibility of WC waste blocking other branch pipes".
I think I understand what it's saying, but how can I avoid this in this instance?

Many thanks in advance,
Tony.

PS. The reason I've used Wickes fittings is because that's the closest DIY store to me!

 

[helpsy]

Hi Tcarnell
I am quite new in the industry so learning all the time.
If I remember if you put a new soil/vent pipe in you're meant to notify building control.
You'll also need to make sure the vent pipe extends to 900mm above an opening if within 3 metres of the opening i.e(window)
You need to be 1.7metres max from soil pipe for a basin(unless you use the waterless valves(hep v0)
3 metres for bath
6 metres for wc
Also if you look at building regs part H this should help you

 

[stevetheplumber]

that will suck like mad each waste has to go to mthe soil seperately although you could take the bath out seperate and form a stub stack for the wc and put the basin into that

 

[tcarnell]

that will suck like mad each waste has to go to the soil separately although you could take the bath out separate and form a stub stack for the wc and put the basin into that

Thanks for the reply. I did a search on 'stub stack' and think I understand about them.

Would you propose that the best solution would be to take the wastes from the bath and basin out separately and join them into the stack outside at the soil branch (marked on my diagram)?
Or could I join the bath waste into the same pipe used for the basin and just carry the one waste water pipe outside to join the soil stack?

Thanks again for your help and advice.
Tony.

 

[stevetheplumber]

ideal situation is all out to stack seperately but often see bath and basin on 50mm pipe with anti vac trap on basin

 

[tcarnell]

ideal situation is all out to stack seperately but often see bath and basin on 50mm pipe with anti vac trap on basin

Thanks again for your advice stevetheplumber.
I've decided to take both the bath and basin wastes out separately before joining them into the stack.
It may not be as neat as only having the soil pipe visible on the outside wall, but it's the best solution from a functional point of view.

Many thanks,
Tony.