What are the screw fixing centres for partitions, ceilings & encasements?

In general terms for partitions, screws are located at 300mm centres (200mm centres at external angles). For ceiling systems, the screws are located at 230mm centres within the field of the board and 150mm centres at board ends. For encasement systems, screws are located at 150mm centres. However, these general guidelines may vary depending upon the system being used so always check against specific systems for your reference.