I'm about to replace a load of carpets in my house any have some 9mm Cloud 9 Cirrus underlay to put down. However, on pulling up the old carpet and underlay, there is a layer of thin ply on top of the floorboards. Any ideas why it's there and should I leave it?
Gaps between the floor boards are reasonable - was thinking of taping them up with masking tape or similar. Perhaps this is why the ply is there (only in the hall though it seems)?
a