House i recently moved into has a timber shed in the garden. It seemed to be in OK condition but a bit neglected and in need of maintenance - damp patches appearing in roof panels, rotten fascias, a couple of rotten planks along the back at the base. I want to keep it as it has power and light, is about the right size for me, has a built in workbench and I can't afford a new equivalent! Got a local shed and fence man in who agreed it's got a few years left in it - he re-felted the roof and replaced the rotten planks and fascias. It still needs a good paint which I can do if the rain, sleet and snow ever stops but a new problem has appeared and I could use some advice please. Since the re-felting, there is damp seeping across the floor from the back wall where new planks were put in. The problem appears to be that the new felt is stiff and where it's pinned onto the roof overhang, it angles in towards the wall of the shed so water is going down the back wall. I can sort that out with guttering which I intended doing anyway but....... I'm on a hill, the property behind me is slightly higher so I probably get run-off from them. The back wall of the shed is only a couple of feet from the boundary fence and the space between is gravelled. When I scraped back the gravel for a look I expected to find a weed membrane as that's what's everywhere else in the garden but this is thick stiff plastic that isn't letting water through. I can't actually see what the shed is sitting on at that side as the bottom two planks are sitting on the plastic and water is pooling there. On the opposite side of the shed, I can see a timber base. Should I do something like remove the plastic, dig a small trench along the back wall and backfill it with gravel/stones for better drainage and to try to keep water away from the wall? Thank you!