Hi All, A customer has a rear-of-house lean-to structure (containing a bathroom) which has a leaking flat roof that needs replacing. On examination the existing roof is chipboard laying on the ceiling joists. It has zero pitch and the chipboard is now turned into Shredded Wheat. The top covering is shed felt. My plan is to turn the flat roof into a low pitched roof, by: mount a timber wall plate in order to fit hang rafters. (Max pitch is 12°due to a window) fit 12mm wbp ply sheets cover with a damp proof membrane like this: https://goo.gl/GcGUrz cover with felt or perhaps some fibre roof slates like these: https://goo.gl/9wqW25 fit guttering etc The lean-to is south facing and not too exposed due to other surrounding structures. Any thoughts and recommendations on method & roof coverings would be welcome. Many thanks.