Hi Serena D - I forgot to add when we got our little 4x6 coop we placed it on a paver stone patio and then rest the bottom of the coop foundation on treated 2x4's so when it rained there wouldn't be a bunch of water/mud seeping into the coop floor or puddle damage to the supporting studs of the coop structure. It didn't totally keep out water on the edges but the center stayed dry even during gully-washers. A pop-up canopy and tarps over the coop are a huge help for added protection. Since your shed roof slopes toward your little coop the rain will pour onto your coop from the shed roof. This is one of the reasons we positioned our little coop 3 feet away from the garage wall. We have rain gutters around the roof but in heavy rain the gutters can't handle the volume of water and our coop would've been drenched if we didn't have the foresight to keep it a few feet away from the garage wall.