Floor levelling, half wood - half concrete.

[hvendlor]

I want to prepare our kitchen floor for tiling. Currently half is floorboard on top of joist, the other half is a layer of asphalt on top of concrete.

I have levelled out the timber half best I can by adjusting the joists, probably get away with the level on this floor now. With the floorboards on, the timber floor is now approx 15mm lower than the concrete half.

Would the best thing to do be to cover the wood half with 18mm ply and then use self levelling on the concrete half only to meet up with the level of the ply?

OR

Cover the wood half with 9mm ply and then screed the whole lot?

 

[Del W]

Welcome to TF.Before you do anything,the timber floor needs to be solid with no deflection(bounce).

 

[Qwerty]

Get levels the same, then Ditra over the lot

 

[Mike]

you would still need a joint/grout line running through the transition. this can be filled with colour matching silicon to allow for movement between the two substrates

 

[grumpygrouter]

Get levels the same, then Ditra over the lot

You'd still need a movement joint in the ditra and it wouldn't address any deflection issues, they would need to be sorted first.

 

[Aston]

as a above, expansion joint needed where 2 different substrates meet in a straight line.

 

[Qwerty]

Yes, sorry, I was assuming all deflection sorted :19: ........ and as Mike said....silicone the movement joint (dont waste money on expensive expansion joints). Mapei have colour matching grouts & silicones BTW

 

[hvendlor]

There isn't really any deflection where the two floors meet as the joist ends are actually sat on a ledge in the concrete, I bolted them down as well.

Never heard of ditra but gonna read up on it

 

[White Room]

Every material has it's own expansion...