Got the post holes dug out today. Took us 4 hours to stake them out and dig 8 holes apprx. 3' deep each. Rented a one man post hole unit but it took 2 of us, a shovel and a breaker bar....Pennsylvania is FULL of rock, at least around here it is. Using 4X6 pressure treated posts rated for ground contact. The shed itself is to be 24' wide and 10' deep. Roof will be about 7'6" in the rear and 8'6" in the front with a bit of an overhang front and rear. Was planning to arrange rafters of 2X6 at 24" apart. Also planning to use 2X6 sandwiched on either side of the posts full length of front and rear. With this roof pitch am I OK considering snow load of 24"?