I have a 3'x5' coop with a flat (slanted) wooden roof that I am going to paint or stain and then I need to cover it with something (a stapled on shower curtain, rolled roofing stuff, something). At HD they sell palruf for $13 a panel - I think 8'x4'. If I bought 1 and had them cut it in half, could I overlap the pieces and allow a 6" overhang on all sides of the roof? How does it get attached to a flat wooden roof? Screws and then a dab of caulk? Would it be strong enough to let to hang beyond the edges of the wood roof? How about even just 3 inches instead of 6?