Plywood Floor Joist Spacing

The vast majority of floor joist systems are built with 16 oc on center spacing.

Plywood floor joist spacing.

For example in the 50 s and 60 s many homes were built with 4x10 joists at 4 oc. There is a picture of this below. However such construction used 2x6 t g or 1 and 1 4 plywood subfloor material. The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example.

But larger is not always better when builders are constructing a home or adding a room addition. The amount of weight that will be on the floor is going to be a big factor when determining your joist size and joist spacing. Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor. The answer is that it depends on several factors.

A 3 4 inch sheet of plywood weighs approximately 75 lbs. So how far apart should floor joist be for a shed. Floor joist spacing has traditionally been 24 inches on center or from center to center of the joists. Measure and dry set the first piece.

Your goal is to have the plywood end exactly half way across the joist so that the new plywood can start on this spot. It is possible to build with wider spacing. Don t stack too much plywood on the same set of joists and overload them.