Shoutout to the guy at the lumber yard in Boise who told me to stop overbuilding my shed floor
For two weeks I kept adding joists to a 10x12 shed floor because I figured more wood equals stronger, and by day 9 I was $140 over budget and the thing weighed a ton. He looked at my plans, laughed, and said my 2x8s at 16 inches on center were already plenty and I was just making more work for myself. I ripped out the extra framing that weekend and the floor is solid with zero bounce, even with my 300 pound neighbor standing on it. So yeah, I was wrong about needing to double everything up, and I want to hear from folks who went the other way and actually had a floor sag on them. What spacing do you run on a shed that holds real weight?
Man I see this same thing everywhere, not just sheds. My brother in law does it with engine oil, changes it every 1500 miles because more is better right? Same deal with people salting their driveway with a whole bag when a cup would do. We all got this voice in our head that says if some is good then double is better, and nobody ever tells us to stop. That lumber guy did you a real favor by laughing at you, because most people just nod and let you keep spending. For what its worth my shed floor is 2x6 on 16 centers and its held my riding mower and a stack of concrete bags for 6 years with no sag, but mine is only 8 feet wide so the span is shorter. If you go 12 feet wide you might want 2x8 at 16 like you had, or drop to 12 inch spacing with the 2x6s. Either way you were already fine the first time.