WHAT CAN YOU USE TO FILL GAPS IN PLY BOARD FLOORS?

IMO the problem is that the previous person had bought insufficient ply, and ended up making a patchwork of scraps.

If you measure it to identify the thickness (or pull up a scrap and take to the timber yard to match it) you could start by buying a single sheet, and cutting it to precisely fit one of the places where you pull up an ill-fitting patch, you will get an idea of how easy or difficult it will be to patch the rest.

Use the largest pieces, with the fewest cuts, you possibly can.

Fillers will be a bodge and I think will crack or sink and spoil your new flooring.
 
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