thank you Jimmy T. Your advice as usual gives us so much confidence.
This evening however, we have received another email saying that they have been recommended to use 5mm regupol plus relay their current 2mm of quiet step underlay. They are also going to carpet the 3 bedrooms.
At least this is a start. But as you say the OC cannot instruct them on what insulation to use nor overturn an adjudicator’s order. However they do need OC permission to pull up the floorboards.
At this stage I think our response will be that even 11mm regupol is only a ‘distant second’ to carpet. They will still take a risk that this will not fix the problem. To quote our neighbour she states that ‘she is confident this premium underlay will considerably improve the noise transfer into our unit and meet the by-law”.
Any further opinion would be appreciated. Should we request that an additional 5mm underlay would be the minimum.