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Happy with the finish and did you do it yourself?
yes, and yes, but I didnt have to level the floor as the builder had already made it pretty level.
after removing any bits where the ply would high point, I screwed and glued over the concrete, overlapping onto the chipboard bit and existing floorboards, then used a brad gun to nail down the rest of the ply at 300ish centres.
I've also used some 2mm foam underlay stuff over the floorboards where they were a bit warped just to even it out.
if you're not sure whether the concrete has a damp proof membrane you'll need to put a suitable DPM down before going over it.
it's not too difficult, just a bit awkward manoeuvring the big sheets of ply around and cutting them to fit around the edges etc.personally I wouldn't attempt breaking up the concrete floor by myself. depends how confident you are with the tools and if you're happy you can fix anything you mess up in the process!
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.