18mm or 25mm DWP boards

[Sonyman]

I am going to tile our kitchen floor, after I have ripped up the 18mm chipboards and laid down DWP. But as the existing floor is only about 4/6mm below the hallway floor, and if I use 18mm DWP then say about a 8/10mm tile on top, that would make it approx. 24mm above the hallway floor. If I use 25mm DWP plus the tiles and grout, the floor would be about 30mm above.
Is there anything I can use to compensate? for that amount of step?

 

[splinter]

If there is a doorway, a threshold

 

[gcol]

How about a ramp for the disabled?
Sorry.

 

[Sonyman]

How about a ramp for the disabled?
Sorry.

I might be by the time I have finished the job, lol

 

[Sonyman]

Just for info, I was talking to a tiler, who used to live next door to me, last night and was explaining what I was about to embark on,and he told me to use 25mm DWP, with flexble adhesive anf grout.

So there you go. I'm sorted now!