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Think you probably did about the best you could given the circumstances. Rather than underlay it would maybe be better to chock the boards up on wooden blocks but getting them to sit flat on the slab will be tricky.
When I did it on our ground floor the joists were the other way around so I just took the whole thing out and put a new joist in across the hole where the hearth was. It took me some time and created a vast amount of rubble. Then I did it to the other hearth too. Feels like a lifetime ago.
rhowe
tbc
Thanks for your reply.
I removed the layer of cement from under the tiles and the hearth "stone" and got it down to roughly the level of the joists with an SDS drill.
I have rearranged the boards a bit so that most of the boards over the hearth straddle it completely and can attach to joists either side of it - luckily my boards are running with the hearth rather than perpendicular as in the video.
I was thinking of putting some old carpet underlay between the boards and the hearth to hopefully cushion any gaps and still allow for some movement.
What are your thoughts on this?