Sound proofing on 2 x new semi detached bungalows

[KarlOB1980]

We're building a couple of semi detached bungalows and are wondering if anyone else has done something similar.

Between each house we have 100 mm solid concrete clocks and 100mm cavity with sound insulation.

The sound proofing guys have recommended we then need to come in 10mm on each side of the concrete blocks and construct a 100mm insulated stud wall with sound proof board.

We have gone back to them to say sure just dot and dab sound proof board on either side should be sufficient (even if this is doubled up).

Does this all sound normal?

[Moonshine]

That sounds over kill, the additional insulated stud.

 

Are you trying to exceed the minimum requirements of ADE, what have you asked for?

 

Sounds like you are building something like a robust detail E-WM-27, more than enough for building regs, it should actually perform at min 5dB better.

 

 

[ADLIan]

+1 on Moonshine's info.

 

Note that to comply with the AD E you will either have to adopt the RDs and register them with Robust Details Ltd or undertake acoustic testing on completion of the units to show that the required insulation levels are achieved. Note the insulation in the cavity here does very little acoustically as it is there to avoid cavity wall thermal bypass - standard spec is mineral wool with a density of at least 18 kg/m³