Best loft conversion underlay for carpet?

[DumbBlonde5]

Our loft conversion is almost finished and (among other issues) we have discovered our builder has just reused our original loft insulation under our new loft floor. Chatting to neighbours also having lofts done they were advised to improve insulation to reduce sound issues for bedrooms below.

We are having carpet and now looking for the best underlay to reduce noise and for warmth. Each carpet place I call suggests something different. What is generally the best option?

1. One suggested cork then underlay then carpet as cork is light and reduced noise really well.

2. Second said a good normal underlay with DB and tog rating would be fine such as Cloud 9

3. Third suggested specialised acoustic underlay and good carpet will do.

What are people's thoughts please?

 

[foxhole]

There are often more than one solution to a problem , all the above will improve situation , often down to cost .
I would be more concerned tv Ned about inadequate insulation , building control involved? Did they check ?

 

[DumbBlonde5]

There are often more than one solution to a problem , all the above will improve situation , often down to cost .
I would be more concerned tv Ned about inadequate insulation , building control involved? Did they check ?

Yes building control are involved but the builder books the visits himself for a particular weekday as he has said there is an inspector he tries to avoid. I saw the person coming out once and she was a young trainee and didn't spend long up there and just passed it. I think he has done what is needed for regs but apparently under the floor doesn't have specific requirements other than to have "some insulation" which by reusing our loft stuff he has. He has often said not to worry about building control because they don't check stuff and will pass most things which doesn't make me feel very happy!