Prime 18mm plywood substrate with Bitumen primer and allow to dry.
To primed substrate apply Autotene 3mm.
Follow with Index Nova Grey coloured Mineral Cap sheet to the 3mm underlay, laps offset, form turndown edge on upper roof.
To deck apply layer of 4mm Index Testudo SBS as an underlay, followed with 2nd layer of Nova Plain Talc surfaced membrane.