more on soundproofing a room.

Acoustic plasterboard is one of the cheaper ways to get mass if you can take the extra floor height.

Pyrok is harder to work with - it will dull saw blades very quickly when you have to cut it. This company seels it in the UK. http://www.encon.co.uk/building/buildingboards.php I have dealt with them in Ireland and they are good. Another board to ask them about is 'Fermacell' which is not as dense as Pyrok (1150kg/m3 versus 1300kg/m3) but is much easier to work with and is still 35% heavier than acoustic plasterboard. Fermacell is Gypsum based like plasterboard but denser. I think Fermacell might be worthwile in your case to be honest. Google Fermacell flooring to get an idea of their system, they do a 20mm thick board with a neat overlap detail.
 
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Fermacell is good stuff for drylining; it's a 15mm resin-bound gypsum-based board, and can take quite large point loads out of a single fixing, great impact resistance etc. As such one board product does the same job as the differentiated moisture/fire/acoustic rated board products from the usual plasterboard players (British Gypsum / Lafarge/ Knauf in the UK, and competition is cut-throat). It's also importd from Germany. Consequently it's slightly more expensive in the UK than the straightforward plasterboards - but not substantially more dense.

'Pyrok' is one name for cement-particle board, but there are several other equivalent products out there with similar densities eg. 'RCM Cemboard' , 'Bluclad' etc. All are available in a range of thicknesses, typically 6-18mm depending on what you need.

A newish product with even greater density than cemboards is magnesium-oxide board; it - like cemboards - is used primarily for sheathing but there's no reason it shouldn't be used for mass-loading also. Google for 'magnoboard'...
 
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what do you guys (felix and andy) think about the fact that many of these boards are not tongue and groove?

will the sound just go through the cracks? - or is this not really a concern?

thanks for everything so far..
 
hi andy/felix

reckon it will be the fermacell. It seems by far to have the best perormance/price ratio for this purpose. Thanks for the heads-up
 

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