in the trade one ignore it and accept the 3-4mm in the flooring
Probably even less - more like 1mm
But I'd always notice it.
And it would probably squeak.
Routing actually seems like a sensible idea. With my luck, hammering would just mush the boards.
You won't notice the 1 mm, laser boy.
But the squeaky I get.
I would get some extra joist hangers and cut them up to make spacers to apply to the joists a spaced about a foot apart. I'm sure that would support the subfloor successfully without squeaking.
@bright started
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Probably even less - more like 1mm
But I'd always notice it.
And it would probably squeak.
Routing actually seems like a sensible idea. With my luck, hammering would just mush the boards.