Waste pipe planning - how to join them all in to the main stack ?

[edwardk]

I've cut a hole through the wall for the WC waste pipe and have fitted it to the main stack.

I need help with how to connect the shower waste to the main stack and also the bath and basin to the main stack.

Here are some images:

Can I run the shower waste into the WC waste ?
If not then should I take it along underneath the WC waste pipe then outise and into the main stack below the WC join?

With the basin and bath can I just run the basin into the bath waste and then outside and join it in?

I could do with some help!
Thanks
Ed

 

[Simon F]

depends which way the floor joists run. send all wastes independent to the stack, cant connect immediately around wc branch because of cross flow may need anti vac traps for the shower and basin because of the length of pipe run

 

[tamz]

:iagree: Take your vent pipe above the roofline too.

 

[kirkgas]

:iagree: Take your vent pipe above the roofline too.

haha i was thinking that when i seen the first pic, old skool rule!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[edwardk]

Will take above roofline for sure - just wanted to put a bit of offcut in and get it sort of looking right and see where the line was.

So....

Shower
I was planning on getting the fall line right from the trap area to the point where it breaks through the wall and into the main stack.
Is the fall line for showers the same as for the WC ?
I ran the WC at 1:40 (25mm over 1000mm).
Am I right in thinking that the shower can go in to the main stack at any point above or below the WC input?
ie it's running into the stack from the same side so there will be no crossflow.

I guess that the easiest way of doing it is to run it from the stack at the right flow line up and into the house.
Where it ends I guess I may have to build a plinth for the shower base.

I got some 40mm pipe for the shower.

What's the rules about anti-vac and where do I fit them?
The run is going to be about 3 metres from shower trap to main stack input.
Probably a 45 degree turn just after the trap, then a long run of about 2.3 metres; through the wall then a 90 degree bend and a short 600mm section into the stack.
Thanks fro any advice !
Ed

 

[jackyp1234]

good luck, looks like its going to be a great bathroom

 

[Simon F]

3m is just ok for 40mm pipe. the basin looks a longer run, basin would usually be 32mm pipe, the distance when you need to fit an anti vac trap is 1.7m. you just buy a trap that is fitted with some form of preventing trap seal loss. such as a hepvo valve ( expensive ) or a regular 75mm style trap with the anti vac, much cheaper

 

[AWheating]

www.wickes.co.uk/content/ebiz/wickes/resources/images/gil/73.pdf

[DLMURL]http://www.hunterplastics.co.uk/download/29/[/DLMURL]Design%20Criteria.pdf

http://download.polypipe.com/bp/sta...ent/soil_vent_product_design_installation.pdf

 

[Paulus]

Thanks for pointing all that out AW. No wonder I'm struggling for work.

 

[MattWeth]

:iagree: Take your vent pipe above the roofline too.

But don't shade your solar thermal collector with it 😉