Drywall vs Plaster ???

Hello :) maybe it's a stupid question, but I'm planning a new studio design (here viewtopic.php?p=106399#p106399), and I've questions about the drywall for isolation walls. Here in Greece, it's not very common to use drywall panel, usually we use hand made plaster, we use a machine to project the plaster, and then they smooth it by hand. Do you think that there is any pro/cons to use that method, or should I go with the standard drywall panels ? I think that the projected plaster must be more easy to seal than the panel, and should offer less risk of sound hole. Don't need green glue or anything! The price should be the same as layers of drywall panels. What do you think about it ? -fx

The advantage of Drywall is it can be made with special properties and is easier to handle. Gyprock Fyrchek for example is described thus:

Gyprock Fyrchek™ can be used in wall and ceiling systems where fire resistance is to be achieved and is useful where improved acoustic performance is required. Gyprock Fyrchek™ is machine made sheet composed of a specially processed glass fibre reinforced gypsum core encased in a heavy-duty linerboard, which is pink on the front face.

Ok John, thanks for the informations ! but for my own need, I can go with projected plaster, or is there any drawback ? (Knowing that anyway, I'll use standard drywall - I'll not find anything better around - and that the price of the labor will be around the same as 2 layers of drywall panels - if not less !) Thanks for the help ! Best regards -fx PS: and if you have 5minutes to waste, take a look here : viewtopic.php?p=106399#p106399 ;)

The difference is testing, gypsum (sheetrock) is what most tests are based on due to the ease of installation/availability/cost, etc, so information is readily available. Plaster is a rigid boundary, somewhat like concrete with a lessor mass/density and not much information readily available.