I'm getting ready to do a roof and I've noticed a lot of the roofs in the area have "dips" between the rafters or trusses, which I would guess is from using too thin of a plywood or OSB sheathing. My addition will have trusses 24" O.C. with a 8:12 pitch on the main roof and a 5.45:12 pitch on a shed dormer, both with asphalt shingles. I'm in the Mid-Atlantic region so snow load is a consideration, too. The lumberyard spec is for 7/16" OSB. From everyone's experience, is that sufficient or should I up the size to 1/2" or even 9/16"? I'll be using "H" clips between the trusses.
Thanks in advance for you input.