Underlay between carpet and hardboard only I’d say.
I covered my uneven floorboards with hardboard and with the carpet down it’s pretty unnoticeable how messed up the boards were. Would be even more so if I hadn’t been so tight to not splash out on posher thicker carpet underlay. Get some “dream walk” or “cloud 9” and you’re sorted
Underlay between carpet and hardboard only I’d say.
I covered my uneven floorboards with hardboard and with the carpet down it’s pretty unnoticeable how messed up the boards were. Would be even more so if I hadn’t been so tight to not splash out on posher thicker carpet underlay. Get some “dream walk” or “cloud 9” and you’re sorted