Subject prolly been covered before.
It's about 17' x 9' against the rear wall of the bungalow, polycarb roof with typical bowing of the support bars. The 17' is all uPVC windows + a door. Besides it being horrifically hot in Summer and bloody cold in Winter it has a leak if rain comes from the wrong (right) direction. Time for a new roof. I was thinking of using that tar coated chipboard with felt shingles on top, insulation underneath between the joists etc. No idea of the load bearing capabilities of the uPVC windows. Any ideas/suggestions much appreciated.