Fitting shower tray floor not quite level.

[tommyleestaples]

Hi all, I am looking to fit a Mira Flight Low Profile 900 x 900mm Stone Resin Quadrant Shower Tray which has reinforcement underneath, please see attached picture. 

 

I was hoping to fit with CT1 silicone but where the radius edge of the tray is (red section) it needs raising up about 3mm to be perfectly level. What are my options. 

 

Could I put more silicone around the radius part and then put some plastic packers around the edge to raise the tray up or have I got to do a cement and mortar bed?

[Nickfromwales]

Are there any recommendations from the manufacturer that came with the tray?

 

If it's only 3mm you actually need, that's more like 5mm at the problem area if you allow for ~2mm of CT1 where your just bonding it down. If you use a lot of CT1 you could just use that and leave it to set, as that would be within the tolerance of what I've done previously without issue; you do have to use a LOT of it and cover every rib / point of lowest contact to pull this off successfully.

 

As a note, CT1 is not a silicone, and I would never use silicone for this type of application. Silicone is the final cosmetic seal, only.

 

Use CT1 along the back of the tray as well, to mechanical fix this to the adjoining walls, masking the top of the tray to leave 3-4mm of tray exposed so you can dress the CT1 in and then remove the masking. Use baby wipes, lots of them, to remove the excess sealant.

 

I would possibly use 1mm - 2mm packers to take up the part which requires the most amount of sealant to level the tray, but you shouldn't have the tray resting on a packer and the packer being sat on the floor, as there is a possibility of the tray moving when you're in there, under your weight, and this should be all resting on the CT1 vs direct mechanical fix. 

 

Use tile wedge spacers to hold the front edge of the tray at the desired height/level during the curing, and leave for a minimum of 72 hrs before standing on it.

[tommyleestaples]

Thank you so much Nick. Very helpful 

[Alan Ambrose]

If I've understood you correctly - any chance of shaving the 3mm off the back of the tray instead?

[Nickfromwales]

4 hours ago, Alan Ambrose said:

If I've understood you correctly - any chance of shaving the 3mm off the back of the tray instead?

3mm is 2 credit cards. 

 

"Step away from the industrial belt sander............with both hands raised..........and walk towards my voice"

[Beau]

I've just laid a Mira Flight tray with some OB1 and needed a 2mm packer under one corner. I went for blobs at the the nodes and all around the edge to make sure the OB1 was thick enough to bridge any gaps. On ours the edge protrudes down around 2mm-3mm more than the rest of the tray so if going for a continuous bead you will need a lot CT1/OB1. I went through 2 tubes with just a 2mm packer and blobs. 

Edited Thursday at 07:28 by Beau

[Alan Ambrose]

>>> 3mm is 2 credit cards.

 

Or, in imperial, about 5 miles if you have OCD. Or as I call it 'attention to detail' 😄 .