When installing a concealed cistern how support the flush water pipe?

[benjiman]

Hi guys,

Installing a concealed cistern with a back to wall toilet. When it comes to pushing the toilet in the flush pipe will flex backwards putting a lot of stress on the connection at the bottom of the cistern.

Same would happen when removing. Could possibly damage it also as when pushing in and out it does require some force.

Are you supposed to support this pipe with some timbers or something so that there is no pressure on the bottom outlet connection? What is best practice?

 

[benjiman]

 

[Madrab]

Nope, you are supposed to have the flush pipe cut to the correct length and then there should be access at the rear of the pan when fitting and removing so you can get to the pipework with your hands to support it.

 

[benjiman]

So the tiled panel that goes infront should be made to be removable?

I thought it would be similar to the geberit wall hung frames where the pipes have support so you only have to push in. Then access to the cistern is via flush plate for maintenance.

If I support the outlet pipe in the same way so it can be pulled in and out without stress to the connection, then leave top access to the cistern it would do away with needing to have a removable frame. Just thinking out loud, obviously its seems that is not the correct way and best practice.

 

[Madrab]

So it's bespoke concealed cistern being created? These installations are rarely designed with any servicing in mind. Access through the flush plate is only for the cistern internals. If for whatever reason the flush pipe or pan seals fail in the future then it could be a hammer to get in there to fix it.

Had to cut out the front panel on one tail end of last year, the flush pipe had been dripping for some time and the P5 flooring eventually failed.

If access is created to start with then if it ever needs work then access can be gained without destroying anything. It's not difficult to design in a removeable panel.