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Yeah that’ll be fine. Just go nuts.
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Plenty of levelling compounds that will do a thickness greater than 20mm. I forget the threshold but you may need to mix an aggregate to help make up the total thickness. Give Ardex tech support a call and they will give you the 411 oj the ideal product.
Personally I would replace your floorboards with the 18mm ply/substrate to ensure a better fix down to the structure but you do you.
chrisbmx116
EstelleGetty
@CYOA
What's the max depth I can fill with some kind of self levelling compound?
We've got some wonky concrete which is angled and higher than some floorboards in another part of the room. If been looking at ways to bring the boards up but what if....
We put some thick (16mm and above) ply/hardboard down over the floorboards. Then self level the wonky concrete up to the thick ply, then board over the whole thing.
I've seen some that do 10mm in 3 hours but is there anything that'd do 20mm. Can you do two sets of 10mm? I don't want to grind down the concrete or dig it out because it looks like a wet sandcastle underneath it.
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