Sound proof room

[Bodidly]

I know this is not what this forum is aimed at but I hope you clever clogs might have some good ideas.

I have been asked to build a machine enclosure in a factory 5m x 10m and 6m high. It is in fact a room were a large woodchiping machine is being used but they want no minimize the sound leaking into the main factory space. Legally they need bring the sound down by 20db but more the better. 
 
Any thoughts welcomed

Beau

[rondurrans]

If there is a legal requirement to reduce the noise level I would suggest getting an Acoustic Engineer to calculate what is required - he will carry the relevant Professional Indemnity Insurance in case something comes back to haunt the factory owner at a later date.

[Barrie]

Have a look at the British Gypsum White Book there's a whole section on accoustic design and lots of information on compliant design details.

Very versatile in creating sound proof boxes but care would be needed in specifying the exposed surface boarding depending on the type of mechanical knocks they are likely to receive in a factory environment.

http://www.itmps.co.uk/digitaleditions/British_Gypsum_White_Book.html

The technical advice tab on the home page gives contact details for design advice.