Wetroom Former Size brand and type

[One Day]

This was 1700x1200. As you can see, the tray wasn't exactly of the shelf and due to 3" joists in a very old barn, had to be built up.

 

[YT233]

I've always moaned about them not being integral to the tray and the lack of weep holes to allow sub surface drainage. But if the drain is properly installed with membrane properly fastened in, and epoxy grout is used, I'm happy enough with them. The main attraction is that they sit straight on the joists.
As for kerdi, yes you could but not easily. The edge height would be approx 45mm from memory so your into shaving joists which is not always possible. Plus increased time installing.
The plus side, they look great and integrate to the walls brilliantly.

What if you ply upto joist level in the full room. Install a Tray such as the Wedi using thin set then get the rest of the floor up using Wedi or Kerdi 20/40mm construction boards?

 

[One Day]

What if you ply upto joist level in the full room. Install a Tray such as the Wedi using thin set then get the rest of the floor up using Wedi or Kerdi 20/40mm construction boards?

Certainly a good option if you can stand the increased height at the doorway.
Wedi fundo ligno is your best bet. Only 20mm at the edge.

 

[banno263]

Hi All,

Please can you advise what former I require for a wetroom area of 1450 x 1100?

Looking through this forum, I know the impey former is not highly regarded. However, Wedi seems to be. Is it possible to cut the Wedi primo 1500x1500 tray down to my size?

The former will be fitted on to wooden joist, so that it’s flush with the rest of the floor.

Kind Regards

Try a Jackoboard (jackon) shower tray tons of sizes and designs including cement boards..your local CTD will have these to show you have show you available ranges..

 

[YT233]

With the Wedi shower trays in particular the Fundo ligno, they recommend setting the waste in mortar by making a box between the joist, placing the waste in and filling with mortar.

Is this an essential part of the install?

 

[One Day]

With the Wedi shower trays in particular the Fundo ligno, they recommend setting the waste in mortar by making a box between the joist, placing the waste in and filling with mortar.

Is this an essential part of the install?

They also make a pre-formed insert which kind of does the job for you. Takes the place of a mortar box, you just need to make sure it's supported below.
Yes, in either case it's essential because the potential flex at the drain (the thinnest point) can open up the connections on the drain.

 

[One Day]

It's called the "drain substructure element".

 

[YT233]

Thank you for your reply,

In regards to the sealing tape, I know wedi say the use of the join Silicon is enough. If you were to use the sealing tape also, does this need to be applied using the 520 adhesive?

 

[One Day]

Thank you for your reply,

In regards to the sealing tape, I know wedi say the use of the join Silicon is enough. If you were to use the sealing tape also, does this need to be applied using the 520 adhesive?

Yes it should be.
A sealing kit contains everything you need for one tray.
It's not a Silicon by the way. I think you mean Wedi 610?

If the area isn't prone to move (i.e. no timber involved) then I'd simply use 610 to join blue to blue (core to core).
But on timber I'd suggest using the sealing kit with tape and 520 adhesive. Safer in the long run.