Calculating gap between tub flange and platform
We have a never installed, 18 year old Jason Hydrotherapy Tub being dropped into a platform. (We are installing it only months after Jason tubs have ceased to exist) We have a solid 2x6 base with 3/4" OSB on top leaving 1 5/8" gap to the flange.
The goal is to tile the base and drop in the flange with a 1/16" to 1/8" gap between tile and bottom of flange for silicone. The tub is designed for full support from floor.
Here is the tile sandwich I am looking at:
The tile will be cheap box store large format porcelain tile that comes out to about 3/8" thick. A 1/2 x 1/2" trowel of thin set should be about 1/4" and Go board is 1/2" so I will be adding a 3/8" ply or OSB to the platform to fill out my gap. I don't mind laminating more sheets on top to support the cheaper large tile.
Does a 1/2 x 1/2 troweled mortar bed seem seem correct at 1/4" in depth?
Is 1/16" silicon gap under the flange seem like a good goal to shoot for?
Jim
1/2"x1/2" will collapse to about 3/32". Here is a good video on the topic