Help with partially collapsed gyprock bulkhead

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During one of the recent storms a lot of water got into the bulkhead downstairs and caused it to come apart and collapse in one section. I have propped it up to dry but looking for some advice as to how I might secure it. The bottom sheet was glued to metal furring channels using what appears to be a (red) stud adhesive. The sheets were also mitred on the edge and stuck together with some more adhesive.

I was wondering what the best product might be to stick the bottom sheet to the furring channel and also the sheets together. I am thinking either Liquid Nails or Sikaflex. I am thinking that I may need to screw the bottom sheet into the furring channels with self drilling screws to hold it up while the adhesive sets. Is there a particular type of screw for this purpose.

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