Proper Shed Floor Joist Support

The screw jacks support the floor joists and keep them out of contact with the ground.

Proper shed floor joist support.

Cut all floor joists to proper length along with your 2 rim joists and two band boards and skids. Also cut your 4 x 4 skids to length. Set batter boards and mason line to mark the perimeter of the posts that support the runners. So what is the proper shed floor joist spacing.

The spacing of both joists and bearers will be governed by the type of structural floor decking that is used. The runners are set back from the shed frame the distance of the overhang. To square the area measure 3 feet along one string and 4 feet along the adjacent string. So typically i would work on 400mm centres for both types of support using 18 20mm thick decking.

After cutting all lumber mark off your two band boards for joist layout at 12 on center. Providing more support and rigidity than cross bracing solid blocking is a reasonable alternative but can be an obstacle for running plumbing pipes and electrical wire between floor joists. If your storage shed is going to be larger then you will want to put in a middle support beam that goes the opposite direction of the way your joists are hanging. It should be placed at eight foot intervals between any floor joists 2x10 or longer.

Solid blocking should be used where floor joists overlap over beams. Gather the proper lumber to cut your floor joists rim joists and 2 two band boards and 4x4 skids. View of underside of shed deck. Although a 2 6 can span 11 10 a span 8 feet or longer should have a center support beam.