Last night, I managed to get the very heavy 3/4" (11/32) treated plywood from the pickup to the backyard using a two-wheel cart. Then I tried lifting and pushing a piece up onto the roof from the back (shortest) side. I managed to get my head out from between it and the top of the fence, but it got caught in the chain links and the horizontal fence section and I couldn't get enough leverage from below to get it free, so I left it sticking in the air over night.