I wonder if this is an unusual arrangement, given the apparent low availability of suitable gullies. Or am I missing an obvious solution...?

 

So, what I want to do is use a former (1200 x 900, center drain), with a gully that has a vertical outlet that goes straight into ta 110mm waste pipe that comes up through the slab floor. And I want a gully that the inners of which can be lifted out should access ever be needed to the waste pipe.

 

I've found a McAlpine gully that meets this spec but it is for membrane tanking. Could maybe make my own former from 4 bits of tile backer board and seal with tape and to the gully?

Assuming you want to tile, the McAlpine one comes in a tile version here 

 

https://mcalpineplumbing.com/wet-room-products/tiles-gratings-accessories-and-conversion-kits/fgt150-sv-110-150mm-square-stainless-steel-tile-internal-non-return-valve-push-fit-outlet

 

need to get the tanking perfect though

10 hours ago, cwr said:

I wonder if this is an unusual arrangement, given the apparent low availability of suitable gullies. Or am I missing an obvious solution...?

 

So, what I want to do is use a former (1200 x 900, center drain), with a gully that has a vertical outlet that goes straight into ta 110mm waste pipe that comes up through the slab floor. And I want a gully that the inners of which can be lifted out should access ever be needed to the waste pipe.

 

I've found a McAlpine gully that meets this spec but it is for membrane tanking. Could maybe make my own former from 4 bits of tile backer board and seal with tape and to the gully?

I am in a similar position, need two shower trays going which drain straight into soil pipe.

 

I am intending to use these - or one of the Wedi trays and then push 30cm or so of waste pipe down verically through a McAlpine DC2:

https://www.wedi.de/uk/products/building-systems/floor-level-showers/fundo-integro

Mcalpine do a number of these wet room traps, I’m just fitting a couple in this house and have used them in another place. 

However they are mostly for screened floors and not a former, you will need to buy one and see if you can fit it to your former. 

I found this whilst doing some research on wet rooms... https://bathcenter.co.uk/marmox-360-drain-inc-stainless-steel-grid-147643-p.asp

 

It does say it only fits marmox 360 trays though?

11 hours ago, PeterW said:

Assuming you want to tile, the McAlpine one comes in a tile version here 

 

https://mcalpineplumbing.com/wet-room-products/tiles-gratings-accessories-and-conversion-kits/fgt150-sv-110-150mm-square-stainless-steel-tile-internal-non-return-valve-push-fit-outlet

 

need to get the tanking perfect though

I would be interested to see that.  It mentions "valve" not "trap" so is it a version of a fanny trap?  I wonder how it would stand up to a drain pressure test?

The Mcalpine  traps work well  with utility room  floor similar principle to hep valve.

 

https://www.plumbers-mate-sales.co.uk/mcalpine-gully-tile-silicone-non-return-valve---39000054-4504-p.asp

 

 

Some interesting options there.

I've also found this from Harmer. Is for membrane though I might well go that route. Only concern is it's a 50mm water seal, our building regs say min 75mm...

As for trays, did I see somewhere on this forum someone that made their own by laying mortar sloped in towards the drain, or did I just imagine that...?

6 hours ago, cwr said:

As for trays, did I see somewhere on this forum someone that made their own by laying mortar sloped in towards the drain, or did I just imagine that...?

This is a standard detail, I will have a couple of these my last house had 3 it’s fairly normal 

you screed the floor with a fall to the drain, then tanking membrane then tiles, no tray needed. 

@Onoff has about 16,000 pictures of his. 

Thanks Russell, I'll try and find the posts.

Decided to go for the McAlpine one after all, as it's 75mm seal and that's what the regs say to use.