Waterproofing Plywood based Flat Roof

I'm in the process of re-waterproofing my flat roof.

I've pulled up the failed bitumen membrane and have replaced the rotton plywood boards. I'm in the process of preparing the flat roof to be waterproofed and tiled.

Am I better off using torch-on bitumen membranes directly onto the plywood or would placing 6mm CSR Ceramic Tile Underlay Fibre Cement and a liquid membrane be a better approach?

Is the 6mm CSR tile underlay usuable in an open roof terrace?

Thanks :D

IMO a cladding of fibre cement and a liquid membrane suitable for roofs would be the way to go.

What he said. :aro-u::2tsup:

thanks! i spoke to csr for further details and they've said its fine to use outdoors as long as the control joints are in place.

seems like it's the way to go! thanks!
(if anyone has gone down this path and has some experience, please let me know!)