Two rooms into one-uneven concrete floors

[MikeJM]

I've removed the wall between our small bathroom and seperate toilet to make one large bathroom and i've now got a drop in the concrete floor levels of aprox 20mm as the floors in each room must have been laid after the walls were built.
Can anyone advise the best method bringing the lower level up? I'm not sure if a self levelling compound would be ok at this thickness or if I should use a heavy consistency of sand-cement say 3-1. Any advice welcomed thanks.
Mike

 

[gcol]

What flooring are you putting down? i.e tiles, laminate, carpet
How big of an area is it that you need to build up?

 

[MikeJM]

I'm laying cushionfloor/lino type covering and the area is quite small, aprox 2.1m x 1.0m.

 

[gcol]

Ok that's not too bad then.
I'd be inclined to screw down 18mm WBP ply and then use something like this http://www.pureadhesion.co.uk/product/198/mira x-plan self levelling compound - 25 kg to bring up to the finish level and fill in round the edges. Or if you've plenty of dosh, forget the ply and just use more self leveller.

 

[MikeJM]

Seems a common sense idea to board the floor. I had'nt thought of that.
Thanks for the info.
Mike