Hello we extended our existing flat roof with an overhang round the house which we had a roofer do which was fine. unfortuneately my neighbour has put up an eyesore in my view so i just want to extend it a little, a small1600 by 850mm addition. I wondered if i could do it some way myself as i cant get anyone to come and do such a small it. I obviously i cant torch but can i stick? If so how and what? Could i overlap existing new felt? Any advice welcome, it is not over the house so leak although not wanted not terminal.