Cc spacing for shed floors the best cc spacing for shed floor construction ( that's center to center!) is actually 12". economically speaking, you could be less then this but then cost would be prohibitive and 12" on center is perfectly fine for cc spacing of joists for a shed.. Storage shed floor joist spacing storage shed foundation kit anchor storage shed floor joist spacing 20x20 wood storage shed in pa portable storage shed bonners ferry idaho metal 3 sided storage sheds quality storage sheds sioux falls sd there are two basic designs for garden sheds and are usually the apex garden sheds and the pent roof sheds.. Regardless of joist spacing, there is significant opportunity for movement where the ground hogs or heaves at the joist where boards meet. this is a weak point. the way to overcome this is to double board the floor over lapping the boards by 50% wherever possible.. Outdoor shed foundation : best investment through shed Shed foundation usin...