Has anyone supplied an answer to the original question? I sure would appreciate some help. I have a gully on a flat roof directly adjacent to the drain...luckily this is only a problem waiting to happen. I need to know what material/s would be best to use to level and slant this section of the roof towards the drain/downspout. I think it goes without saying that the spec'ed filler material would then need to be coated -- the question remains what material to use as the filler, and ultimately what to coat/seal it with. HELP!
Note: I am a "green-horn" to roofing and would welcome any step by step directions provided.