Fixing plasterboard over existing ceiling

[Pastyman]

In our single storey spare room it appears there is no insulation above the plastered ceiling board. It is a sloping ceiling. I want to add a layer of Gyproc Thermaline Insulation board and have it plastered again to increase the insulation. I assume I have to screw the board in place so is there any easy way of finding the existing rafters? Thanks.

[neald]

[quote="Pastyman"]In our single storey spare room it appears there is no insulation above the plastered ceiling board. It is a sloping ceiling. I want to add a layer of Gyproc Thermaline Insulation board and have it plastered again to increase the insulation. I assume I have to screw the board in place so is there any easy way of finding the existing rafters? Thanks.[/quote]you could use a stud detector or knock some holes out with a hammer and chisel to locate the timber