Going to be taking care of the roof for our new coop this week. I have a roof that is going to be about 10'X8'. That will leave a 13" overhang on each side, and about 22" front to back (lean to style). Frame will be using 2x4x8's and 2x4x10's with approximately 8 rafters in there. I will lay down the OSB sheets, and then a 15LB asphalt roof sheet and then shingle the roof as you would a normal roof (slope will be about 2.5/12). Rafters will be attached with hurricane straps. With that being said, would I be alright going with 1/2" OSB or do I need to go with 3/4" OSB? Trying to keep some of the weight down a bit but maintain strength and keep from any compromise. Also, necessary to use PT or can I go with studs? I do plan on putting a drip edge, and gutter on the back as well and drain water away from the coop (it is a sloped area). Thanks for all the help!!