This will be a multi-part series featured on this blog on how to build a shed. This particular section will cover how I build a shed or deck foundation using post / concrete construction. These types of floor joist systems are very strong and will last many many years in the hot Florida weather. In this build, I am choosing to build a lean-to style shed that will sit next to my existing cook lofted barn.
On the initial planning of this shed, I wanted to utilize one-floor skid of the existing cook barn building. You can use an existing 4×4 skid by attaching another 4×4 to the existing skid with 6″ lag bolts. After you attach a new 4×4, add a 2×6 ledger to the skid extension using lag-bolts.
In this step, I used some scrap 2×6 I had to attach the lower skid extension. This will act as a nice ledger base for the joists hangers to connect to. I added a 4″ lag bolt every 18 inches.
I dig a hole deep enough to accommodate the new 6x6x2′ cutoff post. I can add and remove grade as needed in the hole and compact to create a nice level base. Once all of the leveling is complete, I add a 50lb back of concrete to the post hole to ensure the post stays where I intended it.
4 -4″ Lag Bolts are added to the corners of all ridge posts. For added security, you can notch the 6×6 and allow the joists to rest atop of the 6×6. Because there will only be light-duty equipment in this new shed, this will be plenty of support.
Pro Tip: Level as you go and level everything. I always make it a point to keep my levels on my working surfaces to act as a gauge. If you skip these important steps, you will have a crooked building and wall framing and sheathing will become your worst enemy. LEVEL LEVEL LEVEL!
This photo shows the other two 6×6 posts installed and leveled on the exterior side. The center post acts as a support for the two outer 2x6x8′ ridge joists. An attachment photo below shows the connection at center.
I space these 2x6x8 floor joists at a maximum of 16″ on center. ANy wider than that, you will experience deck flex and nobody wants that. Don’t skimp on the joists. You can never have too many. 16″ O.C. is the minimum here.