Im after advice as to how to install either plasterboard or ply to my ceiling. The ceiling throughout the house is currently Strammit (compressed straw panels). Intend using battens to provide a small relief for new light wiring, and securing the panels to the battens.
However, how do I secure the battens to the Strammit? To further complicate matters, in some places there is a significant roof cavity above the strammit, and in others there is none.

