Connecting a shower drainage to a 50 MM run

[EdinburghRob76]

Hello,

I have a ground floor flat and with timber floors and joists and I am currently fitting a wetroom. I would like to connect my new shower drain to a plastic pipe run that goes past my bathroom from the kitchen.
I would be looking to cut this pipe and fit a connector to the shower drain.
The pipe run currently services the Kitchen sink and the Washing machine and I believe it is 50mm pipe (External diameter 55mm)

Having looked for the right parts to connect this up I have a couple of questions I hope someone can help me with

1) the pipe I wish to connect to has an external diameter of around 55 MM so is this 50mm pipe?
2) it has solvent connectors on it so should I use solvent connectors for the Tee or can I use Compression / push fit.
3) The plastic pipe is only a couple of years old fitten by the guys that installed our kitchen. i dont know the manufacturer or exact type only that its white. can I use any manufacturers connector and solvent or is there an issue with using mixing different manufactors pipes / connectors?

 

[Hugh Jaleak]

Push fit wont fit solvent weld pipe so discard that idea! Compression is universal and will fit, but solvent looks a neater job than compression or push fit in my opinion. All solvent weld manufacturers products should be compatible AFAIK, never had a problem there myself. (Push fit sizes can vary between manufacturers I believe but thats not an issue here.)

There may be an issue with the shower trap syphoning as sink or W/M discharge, not sure where you could fit an AAV on a wet room, maybe best to put a dedicated waste in for the shower if possible.

 

[EdinburghRob76]

Thanks Hugh

Will go for compression. had another look and it is polypipe does anyone agree on the sizing? 55 external diaeter = 50mm pipe?

Hadnt thought of the syphoning issue where would you normally fit an AAV?
I got quite a bit of room under the floor to play with? is that something I would add between the trap and the connection to the 50mm pipe?

 

[Hugh Jaleak]

55mm OD sounds right, just checked a 50mm fitting. You may get away without an AAV, not sure how often the 50mm would run full bore and cause enough suction to pull the shower trap. Think any AAV would need to be above spill level of shower though, else should pipe block then shower or other appliance could spill out of AAV under floor level where you wont see it. Not done a wet room so unsure as to drainage arrangements, anti vac traps available in 32 and 40mm, depends what you plan to use here!

 

[EdinburghRob76]

thanks will have a look at the anti vac trap.