Installing Just Trays JT40 Fusion Shower Tray

[Prior69]

Hi All,

I'm about to install a 1100 x 900 JT40 stone resin shower tray into a 3 sided alcove. I've strengthened and leveled the joists and installed an 18mm Marine Ply base. It is dead level.

I've put the tray in place to test/find location of waste and the tray is still level in all directions. Instructions say to use mortar or tile cement to bed in the tray. Is this necessary if it is already level? You can install this tray on a riser kit (6 legs) and it doesn't seem logical to me that the tray can sit on 6 legs but not flat to the floor. The bottom of the tray is encapsulated in plastic, so I cant see mortar sticking to it anyway.

Because the tray is going into an alcove, its going to be hard to lower the thing down onto a bed of anything without it going everywhere. The one that came out was just siliconed on 3 sides and the bottom and did not want to shift! Admittedly it was a fully plastic tray but I was planning on using the same technique.

There is plenty of (conflicting) advice on the internet about the subject...some of it quite old...and I'm still none the wiser.

So, has anyone had a similar experience?

Or installed one with the mortar/tile adhesive method?

What are the real life issues with not installing on mortar or tile adhesive?

Are there any more modern methods?

Thanks!

 

[Madrab]

I have only ever installed one tray using flexible tile adhesive (never used sand and cement) and I've installed quite a few. That was where it was totally impactable to level the floor out properly using any other method.

All the others have had the floor levelled and/or strengthened/plinthed and then used a silicone adhesive (not sealant). A silicone sealant is then used along the bottom edges, sides and then top (after tanking the space) to provide the waterproof seals. Never had any call backs up to now.

I guess the only issue is if you don't follow the MI then if a warranty call was ever needed they may not honour it.

 

[Prior69]

Thanks Madrab.

So something like CT1 or Stixall to stick down the tray?

I'm thinking if I put some on the flat spots on the bottom of the tray..for example where the legs would go that would do? The bottom of the tray is not totally flat....it has mouldings on it..I think to incorporate the fall for the waste. But I've run the spirit level across the bottom and the edges and the areas for the legs are all aligned.

Cheers
Mark

 

[Madrab]

Yes - I use Wetgrab or SticksLike but any polymer adhesive would work I would think.

If the tray has flat areas for the legs to go then yes, that would be the primary areas for the adhesive but I would also add some 'blobs' in the voided areas, just to add a bit of support at those points too.

 

[Prior69]

Thanks Madrab. I think I'll go down this route!