How to complete bathroom floor screeding?

[Danne]

Hi, I'm moving through my bathroom Reno project and my next hurdle is redoing the tiling. The substrate is a water resistant composite wood board (yellow tongue or something similar). I have cleaned up the surface after removing the old tiles and will reseal with water proofing. From my reading of the standards there needs to be a 1:80 - 1:100 fall from the highest point to the centre waste drain. This is going to create a some transition issues from hallway to bathroom, I'm aware of that however, in working it out what my fall will be and the height of the finished floor will be at the door my question is what will be my minimum depth of screed at the waste drain. Also, is Easy Mix the product I should be using for this? and can you buy screed guides to lay on the floor that have the correct fall or is that something I need to make up as a guide fro doing the job.

I've tried to find as much information as I can on this online but have not found anything that ties it all together.

Thank You 

Danny

[JacobZ]

Hi @Danne,

The Easy Mix Traditional Floor Screed would be the way to go. The Technical Data Sheet gives us some good information about its application and limitations.

In the product limitations, it says - 

"Do not use Easy Mix Traditional Floor Screed on: ▪ Wooden, rubber or metal substrates unless the minimum bed thickness is 40mm and is reinforced with an appropriate wire mesh"

As you are applying the screed over waterproofed particleboard flooring, which is a wooden substrate, the screed will need to be a minimum of 40mm thick at the drain, with a suitable wire mesh for reinforcement.

Unfortunately, I am not aware of any premade products that can be used as guides for the height of your screed. The traditional method is to cut timber wedges. Check out How To Screed A Shower Base, which shows how to cut and use them.

Let me know if you have any further questions.

Jacob