Advice on screeds needed

Phoeni1266

Phoeni1266

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I'm about to start leveling an uneven floor in prep for stick down LVT.
Floor is a mix of wooden floorboards in one room, a concrete strip between that room and the kitchen (we knocked out a wall) and a screed on top of plastic tiles on top of floorboards in the kitchen. We've had the tiles tested and no asbestos.
I really don't want to take up the tiles/old screed so was considering levelling the worst of the irregularities with a concrete screed, laying 9mm ply then feather screeding the joints.
Two questions: is this likely to end in a poor finish and, if not, what products are best for each of the two screeds?
Sorry for the long post.
 
You need to uplift all the tiles.
Plywood the wood sections with 6mm flooring grade plywood .
How old is the sub floor? Does it have a visqueen Dpm under it
 
dazlight said:
You need to uplift all the tiles.
Plywood the wood sections with 6mm flooring grade plywood .
How old is the sub floor? Does it have a visqueen Dpm under it
Click to expand...
Bugger! That not what I wanted to hear.
The house is 1950s and the boards are original. I doubt there's a DPM under the wood.
 
Or did you mean under the kitchen screed? There isn't one under that
 
Then you will need a liquid Dpm doing.
So my order would be -
Plywood wood areas
Self level with a moisture tolerant company like ardex Na to the level of the plywood
Apply a epoxy Dpm to the screed
Prime & Self level ( smoothing compound ) to the whole area at 5mm
 
Loads to pick from.
I’d use the same as the screed you buy.
Ardex
Mapei
Fball
Uzin
Bostik
Tilemaster
 
I'm about ready to start this project.
When I ply the floorboards do I need to leave an expansion gap around the edges?
It's just that, on one wall there's a steel perimeter radiator which doubles up as skirting. It's not connected to the heating system but it would be difficult to trim anything if the bottom of it so I can't get the flooring under it.
 
Can you tell me what the purpose of the dpm is? You advise putting it on the screed but the existing screed is over a suspended wooden floor. Is the dpm still required? If so, will Black Jack suffice?
 
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