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you'll probably still need to ply over the whole lot once you're done to get a flat enough surface for vinyl tiles, otherwise you'll get gaps where the tiles join.
subfloor prep is really important for a good finish.
I've just done the same in my kitchen, running 8x4 sheets of 6mm ply over old floorboards, concrete, and a new area of floor that's been brought up to the same level as the rest.
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Happy with the finish and did you do it yourself? Asking for a friend who needs some reassurance.
I suppose the worst that can happen is I spend a few grand in the future to get someone to fix my mistakes. Though having been trying to book someone to look at it since 2019 doesn't fill me with confidence that will be before we move.
Yep, both of those are on my list of possibles, with taking out the concrete with a breaker being the favourite of the two so long as it's safe and doesn't bring the house down around me? It's at its tallest near a wall so not sure if the wall would crack and we'd be open plan with the neighbours before long. Seems like something I'd need to get surveyed first?
The more likely possible at the moment is the scribed layering of hardboard over the boards to lessen steepness of the drop. Level isn't crucial to me as much as not a trip hazard and not going to kink whatever I put down (cork planks or vinyl clicky things at this stage).