Bathroom Waste and Tray Question

[Mjc212]

Hi all,

 

Firstly thank you in advance for any help, new member posting but have been viewing for a while as a guest

 

i have removed my shower tray (quadrant with riser kit) as it needs replacing

want to fit a square tray in the area.

 

I did want to fit a thin tray but as it is a concrete floor i dont think its possible?

also as you can the waste has a fall down to the bend and then back up where it goes into the wall and i presume a central building waste/stack (flats) 

 

question.

is there anyway to install a thiner tray or will i need a riser kit?

and if i cut the waste where it comes in from the wall half way between the wall and the 90 degree bend, can i fit the trap there for the new tray?

 

 

[Bonner]

By thin tray, I guess you mean floor level without risers? If so the answer is probably not unless you can lower the whole waste below floor level. The basics are, trap needs to be connected directly to your shower tray outlet and the waste pipe should fall continuously all the way. If it drops and then rises, it will collect gunge and eventually block. You can get low rise shower traps to minimise the height of your tray but it probably had one already.

[BotusBuild]

As you are in flats, I would say doing something to the concrete floor to lower it is a no-no. So, I think you are limited to a riser kit, and use a shallow waste trap like this

https://www.screwfix.com/p/flomasta-space-saving-shower-waste-white-90mm/513jn?ref=SFAppShare

 

You can cut the waste pipe as you describe, just measure very carefully, offering up the replacement waste trap to check for location. I've just done this myself - attach trap to tray, put a couple of blobs of silicone (or similar) on the bottom of the trap, place the tray carefully into place and allow the trap to touch the floor. Lift it all out again, and you a should see where the silicone touched, showing you where the trap will be. Now take the trap off the tray and work out where that pipe needs to be cut.

[Nickfromwales]

+1 to not digging down. Also, be sure none of this leaks as you may be responsible for damage to the flat below you, assuming you’re not on the ground floor?
 

Just be very careful when moving / altering the pipe that goes into the wall! You don’t know if that goes into a solvent welded fitting or one with a push-fit rubber bung; if the latter you can easily pull that out of the rising (communal) soil stack. That would not be good.

 

I’d cut it to leave about 150mm of pipe protruding, and then use a compression fitting to connect to that. If you use solvent weld and get it wrong you have to cut that pipe again and restart, the compression ones will give you wiggle room and time to keep making alterations to get this all fitting nicely.

 

Use CT1 to bond the new tray in, NOT silicone, and if you search on here (using google) you’ll find a lot of my ramblings on how to do this type of install.

 

Do you feel confident doing this work?