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This is probably a very common problem, but I have don't know what the common solution would be. As a guess, I reckon in the trade one would ignore it and accept the 3-4mm in the flooring. One possibly crazy option to consider, router out the underside of the chipboard as you go to clear the hangers? Or as its softwood could you depress them with a hammer?
I'm not thrilled about either idea though.
Hovis
@NotThamesWater
Flooring question:
I'm laying a T&G chipboard subfloor on a suspended timber floor frame for my garden office.
I've realised (rather slowly, as ever) that the tabs of the joist hangers are going to give me a headache when it comes to keeping things flat.
It's only the centre cross joist (I have no idea what it's called) that's going to be a problem - the band joists will have the sill plates of the wall frames on them.
Does it makes sense to have 6mm ply laid across the whole thing, but out over the hanger tabs?