Fill voids in bowed plasterboards

[Chellvic]

Can someone tell me the best way to fill these voids in between insulated plasterboards before skimming. Thanks

 

[thomp1983]

If the boards can be taken down still then packers behind held in place by the screws

 

[Chellvic]

Boards cant be removed now they have been dabbed.thanks

 

[cdbe]

Bit of bonding plaster.

 

[Chellvic]

Thankyou i will try that