PLUMBERS HELP.Ripped up B'room floor but not enough room for new Shower Waste U bend

andyhop

Best wet room formers are

AKW Tuff2 shower formers, use with gravity tray that sits around 90mm below the finished floor level

These are GRP and require no underboarding unlike inferior WEDI wetroom formers

Can be bought from Wetdecs or your local PTS

Plumbers_Shop_Lee

From how you are dexribing it I assume its not a case of not ahving room for the trap but actually not being able to get a fall on the waste once you put a trap in at floor level. If this is the case then you either have to potentially go back to what you had or look at installing a waste water pump however be warned the loatter option is quite pricey and youve got to find somewhere to hide the equipment

http://www.whalepumps.com/drainage_solutions/premium_wet_rooms/

bob_a_builder

Excuse me jumping in, but have similar arrangement to OP, shower tray mounted on high stand etc and would like to switch to a low level (as flush to floor as poss) tray.

Was wondering what was is generally accepted way of fitting to be able to get access to fit waste/trap etc

ripping out chip board floor to joists as per OP, or to cut some access hole at side of tray thru existing chipboard (joists permitting)
coming up thru lounge ceiling not really an option

Also what is method of securing the tray to flooring/joists/walls etc

Frank_Sebem

Just received a PM, which sorts it all out...

Am gonna buy a product called Eco-Dec from a company called Contour in Winsford. Perfect for what we need, lots of different sized boards with a range of different waste positions (off centre etc). Wedi board was looking OK, but the waste arangement is massive! 99% sure that this Eco-Dec will be good for us.

googler

OP, water cannot run uphill.

The reason your shower was set up high was so that the lowest point of the shower tray was still above the point where the shower waste fed into your SVP (Soil & Vent Pipe). If you lower the shower by forming a wet room or use a low level tray, you have to form a new entry point into the SVP, and the waste pipe from the shower will probably have to run between or through the joists - again, taking into account an appropriate fall rate before it reaches the SVP

Frank_Sebem

Thanks Googler. I already knew that Water cannot run up hill. Maybe I didn't explain properly early on. At present, the Waste Pipe is about 150mm higher than the entry to the Waste Pipe. So, with the addition of this new waste I think the Waste will be about 50mm higher at the Shower end than it will be at the end where it runs into the waste Pipe outside. I'm guessing this is enough??? If not, I guess I'll have to find out somehow what the Angle of the fall of the Waste Water run off should be. Does that make sense??

Frank_Sebem

Oh, forgot to mention....The existing and also the planned waste runs in line with the Joists, so no costly, time consuminmg drilling.

googler

Frank_Sebem wrote: »

At present, the Waste Pipe is about 150mm higher than the entry to the Waste Pipe. So, with the addition of this new waste I think the Waste will be about 50mm higher at the Shower end than it will be at the end where it runs into the waste Pipe outside. I'm guessing this is enough???

Well, it looks like whoever installed the previous setup thought that it should be 150mm, and you're going to reduce the angle, which will inhibit the flow and fall rate, but you'll still be sending the same amount of water down there....... hmmm.

If you're dropping the entry point by 100mm (the shower tray), then I'd say you need to drop the entry point into the SVP by the same amount, probably.

There's lots of detail out there on what the fall angle should be, given certain pipe sizes, whether it's tank-fed or mains-fed shower, etc. Suggest a bit of creative googling or looking at some DIY forums. Or call someone who does this professionally?

If it's any help

http://www.diynot.com/forums/viewtopic.php?t=169476

bluesnake

what is in the room below your En-Suite? Can a false ceiling be put in? is it possible to reconnect the waste pipe lower position, or make a separate drain?

googler

How to build a wet room