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T&G chipboard
As long as the joists are level, this seems like the best plan, if you're taking the boards up.
Glued too.
Ply seems like a very expensive way to do the same, and without the advantage of T&G.
Replacing the boards like for like, if you're a masochist, and want it pErIOd CoRrECt.
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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?
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Sure you want to destroy the original floor boards? They don’t look that bad? Surely a thick underlay and then the carpet would sort it? Worst case you could sand them level first?
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Screw them down (check for wires, old gas pipes (I've 'found' several!) and heating pipes etc with tung tite or similar board screws. Knock in any nails then plain off any super high spots, most pine boards cup eventually, powerplaner makes light work of it. 3-5mm ply is enough to reduce the cupping effect that you'll see in the carpet. Hardboard is barely much different from cardboard, stops carpet going down any of the cracks but you'll still see and feel the cups/warped boards through.
Rip whole lot up and 25mm T+G chipboards if you want to achieve perfect level but its always more work than you think.
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NotThamesWater
Airhead
Jameo
BrickMan
@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
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