Sound insulation - independent wall lining, why in basement?

[mikeyw]

Hi,

I'm developing 2 flats one of which is in a basement. We have employed a sound consultant to help us pass the relevant tests but i'm confused why we need to soundproof brick internal walls in a basement. I didnt want to question his professional advice but it's left me wondering why ?

Please could you see this plan and explain why its needed on the left plan of the basement, if at all ?

Untitled

• mikeyw
• 7 Nov 2013
• 1

Thanks in advance,
Mike.

 

[freddiemercurystwin]

Only walls between a bathroom and a bedroom or other habitable room need sound proofing even then I'd be surprised if a brick wall needed anything in addition to plaster or dry lining each side which it will have by default.

 

[mikeyw]

Is it anything to do with sound travelling down the wall from the flat above ?