Hello... we have started the coop and run. It will be an 8x 4 coop with a 8x8 run attached to it. The run itself will have the clear corrugated plastic on top of it. The coop though is going to be made out of plywood. It will have a flat roof, except for the 1 1/2-2 inch ventialation we will have on the three sides - so little slant to get snow and rain off. What would you suggest putting on top of that to help preserve the wood ( besides the paint) Any suggestions would be great!