HepvO and Wirquin 90mm Slim Shower Waste (Waterless Membrane) question

[plumbduff]

I'm in the process of revamping a bathroom.
At the moment it contains a toilet, basin and bath with an overhead shower.
The basin and toilet share a common waste pipe which feeds into the soil stack behind the toilet.
The soil stack is internal and boxed behind a stud wall in a corner and has solvent weld fittings.
There is only facility for one connection.
I would like to add a separate shower which would need an additional waste outlet.
I'm considering using a Wirquin 90mm slim shower waste (waterless membrane) on the shower, a HepvO trap on the bath and another for the sink to prevent sucking and back flow.
They would be T off into the original 1 1/2" solvent weld single outlet pipe.
Is this a feasible solution, as it would avoid a huge amount of work providing separate waste pipes.


Wirquin 90mm Slim Shower Waste Waterless Membrane

Why choose HepvO? The benefits of a waterless plumbing trap |Wavin UK Blog

 

[Old Account]

I'm in the process of revamping a bathroom.
At the moment it contains a toilet, basin and bath with an overhead shower.
The basin and toilet share a common waste pipe which feeds into the soil stack behind the toilet.
The soil stack is internal and boxed behind a stud wall in a corner and has solvent weld fittings.
There is only facility for one connection.
I would like to add a separate shower which would need an additional waste outlet.
I'm considering using a Wirquin 90mm slim shower waste (waterless membrane) on the shower, a HepvO trap on the bath and another for the sink to prevent sucking and back flow.
They would be T off into the original 1 1/2" solvent weld single outlet pipe.
Is this a feasible solution, as it would avoid a huge amount of work providing separate waste pipes.


Wirquin 90mm Slim Shower Waste Waterless Membrane

Why choose HepvO? The benefits of a waterless plumbing trap |Wavin UK Blog

It is feasible but not ideal. However, if you want to connect it into the original waste run I'd definitely upgrade the pipework to 2" and to the each appliance you can then reduce to 11/2" & 11/4"

 

[plumbduff]

It is feasible but not ideal. However, if you want to connect it into the original waste run I'd definitely upgrade the pipework to 2" and to the each appliance you can then reduce to 11/2" & 11/4"

I'm wondering if a better solution would be to use a non return valve between the bath and shower and between the shower and sink following the advice of this video below?

https://www.youtube.com/watch?v=FcFVDdmDco4

 

[Old Account]

I'm wondering if a better solution would be to use a non return valve between the bath and shower and between the shower and sink following the advice of this video below?

https://www.youtube.com/watch?v=FcFVDdmDco4

I can't tell you if that's a better solution or not. I have seen few times that the non return did not function as it should, because of trapped hair etc... you will also need access to those non returns because you need to clean them. I also think you require a slop of the drain and once you install the, they will not close properly and stay a little open.

I would either try to connect the waste separate or when connecting all on one pipe upgrade the pipework to 2" and reduce to each appliance

 

[plumbduff]

I can't tell you if that's a better solution or not. I have seen few times that the non return did not function as it should, because of trapped hair etc... you will also need access to those non returns because you need to clean them. I also think you require a slop of the drain and once you install the, they will not close properly and stay a little open.

I would either try to connect the waste separate or when connecting all on one pipe upgrade the pipework to 2" and reduce to each appliance

Rather than messing about with dubious fittings, I have decided that the bath and sink should share the same outlet to the soil stack as it has been like that for years without a problem.
The shower will have separate outlet exiting through the wall into the garage roof space down the inside of the wall exiting to the outside drain.
The pipe run will 4.5M be mostly vertical with 45 degrees section and one horizontal section on a slant.
Nor sure whether 50mm would be advantageous over 40mm waste pipe though ?

 

[rpm]

Which waste trap on the shower are you using?

 

[plumbduff]

Which waste trap on the shower are you using?

Not sure maybe something like below:

http://www.NoLinkingToThis/p/mcalpine-shower-trap-chrome-effect-90mm/45503