I've decided to use Cloud 9 underlay for a room I'm about to get carpeted. It's between Cirrus which is 9mm and Cumulus which is 11mm. I'd prefer to use the 11mm underlay but have read that because of its thickness it has to dip down to attach to the grippers and can look strange.
Anyone used Cloud 9 Cumulus underlay or similar 11mm stuff?
Cheers
Steven.