I brought a brand new 3 bed semi 6 months ago and were having noise issues, long story but hear goes when our neighboors moved in we could here every foot step, mainly upstairs every door window etc being closed the washing machine anything being dropped etc, I'm well aware of what to expect in a semi so I called in the builders, two managers went in a house each and spoke on the phone whilst making noises, I could hear the phone call and at one point he said yes I can hear that sounds like stomping and the chap replied I'm just walking lightly across the lounge! Anyway the builders acnolidged there is clearly a issue and got a sound man in, I got talking to the sound man who said this is a waste of time as your problem is impact noise and all I am here to test is airbourne, so I mentioned this to the builder and told him I hope your not gona get your pass for airbourne and brush it under the carpet, " no no we wouldn't do that" low and behould they did.
I'm in the building trade myself so have a fair idea regards the building but I'm trying to work out what could be causing the noise, oh also nearly every other semi on the estate have complained, the dividing wall is 100mm insulated cavity with concrete block and finished with dot and dab, the house is on a hill so ours is sleightly lower than next door, the floor joists go into the dividing wall and seem well fitted with no gaps and iv added acoustic mastic, I read a nhbc article regards incorrect dot and dab making noise worse by creating a drumming affect so I checked mine and it's not good no solid ribbon top and bottom and few dabs, it sound very hollow compared to what I'm use to on site, apparently the only difference between our homes and ones on previous sites with no problems is they used a parge coat and no insulation in the cavity were as our has no parge but insulation, it's with labc rather than nhbc, hope iv remembered everything but I can help more if you need any more info, oh the noise is apparently worse on our side. Thanks
We're still waiting to here back from labc( local authority building control) same as nhbc, but it's getting very stressfull