In the process of choosing underlay for the upstairs of my home, 4 bedrooms, landing and staircase. I think I will be going to Blue Heaven (from the makers of cloud 9). It's like Cloud 9 but without the paper backing as this can sometimes be noisy underfoot.
My quandary is, do I go for 9mm or 11mm? I would like 11mm as this offers greater sound impact reduction and thermal insulation. I have read on other forums that some carpet fitters don't like the 11mm as it is harder to stretch the carpets.