Floor Joists Spacing For Plywood

Attach the band boards to the joists with two 3 inch screws or 16d nails at each joist.

Floor joists spacing for plywood. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. The vast majority of floor joist systems are built with 16 oc on center spacing. Floor joist spacing has traditionally been 24 inches on center or from center to center of the joists.

This a rough guideline. 10 and 12 wide sheds use 2 x6 joists so you will have to cut them to length. On the tops of the floor joists we measure and mark every 4 feet this will be the plywood seams. The osb in i joist webs is not the garden variety osb used for sheathing products.

It is possible to build with wider spacing. However when running spf 2 6 floor joists into the floor joist calculator referenced above you get a maximum span of 9 feet 8 inches with a minimum bearing length of 3 inches at each end on 12 centers. Newer construction has floor joists spaced at 16 inches on center. However such construction used 2x6 t g or 1 and 1 4 plywood subfloor material.

Again this depends on the factors of species of wood grade and the intended load on the wood all come into play. You will need to determine. True floor joist span calculations can only be made by a structural engineer or contractor. In fact instead of being a cheaper substitute for plywood i joists made with osb webs mark a significant improvement in the structural floor framing industry.

Chalk lines are pulled all the way across all the joist tops at the 4 foot marks so we can check our accuracy with each sheet of plywood being attached to the joists. The plywood sheets lay perpendicular to the floor joists. Joist span and spacing is set by your local building code. Lay the joists out on top of the pressure treated skids spacing them about 16 inches apart.

For example in the 50 s and 60 s many homes were built with 4x10 joists at 4 oc.