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Fairly normal to staple 3mm hardboard over the lot or 5mm ply if you like. Underlay and carpet usually soak up the rest so you shouldn't notice anything through it all.
Is it really so bad that you want to replace it all?
Airhead-
Huh, no that's probably sensible. Maybe one or two of the worst that have been chopped in to several sections by plumbers deserve to be replaced.
@TW I'm going to guess the joists aren't level, if the ones in the loft and everything else in the fabric of the building is anything to go by. I think the over-boarding is probably sensible. Does mean a slight level change going in to the bedroom but we're using a slightly thicker pile there anyway so hopefully it'll even out
Polygon
My hallway is getting carpeted in a month, but some of the boards are very short/warped/knackered from historical rot. What's the best method of getting a good solid sub-floor? T&G chipboard, ply, or replacement boards It's more or less the whole upper landing, about 3m²