Flooring for a bathroom.

[slim]

Hi All, I am in the process of building a stand alone (donga style) bathroom, shower, toilet, vanity. It will be approx 4m x 3m. It will sit over a concrete slab with the floor raised approx 160mm, level with a nearby building floor. The floor frame will be steel. So my question is, would yellow/green tongue, flooring be ok, with the area under the shower, sealed. I plan on using some type of panels for the shower walls and an acrylic type floor pan.
Slim

[Beardy]

Yellowtongue flooring in wet areas is a common building practice but you need to fully membrane the floor in the room not just the shwr.
Alternatives are fibre cement or plywood

I know some will say it is particle board and will swell if it gets wet and that is true but in practice the flooring material is there to support a waterproof membrane and if the flooring is getting wet the bathroom has already failed anyway and floor will need to be removed

[rwbuild]

What Beardy said or you could use the Hardi sheet Just a moment... in the shower area only and the yellow tongue for the rest