How Do You Attach Floor Joists to Concrete

Use a wooden ledger, and then attach the joists as you would with frame construction.Use a steel joist hanger that anchors directly to the concrete core of the wall.Build a ledge on the inside of the building to set the joist on.

How do you install floor joists on a concrete slab?

Install it flat on the slab surface, with the outside edge aligned against the side wall or the edge of the floor line. Secure each length to the slab with concrete nails spaced approximately 32 inches apart and 8 to 12 inches from each end. These will be the end “sill plates” that support the ends of the floor joists.

Can you lay joists on concrete?

Joists should be laid 19 inches on center. This will give a minimum 1 1/2 inches space between the bottom of the flooring and the concrete slab, and about 14 inches between joists. Because some water is seeping into the shed, your first step is to make the slab water resistant.