Plywood Floor Joist Spacing

Don t stack too much plywood on the same set of joists and overload them.

Plywood floor joist spacing.

The vast majority of floor joist systems are built with 16 oc on center spacing. Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720 this performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span. Newer construction has floor joists spaced at 16 inches on center. There is a picture of this below.

For example in the 50 s and 60 s many homes were built with 4x10 joists at 4 oc. Your goal is to have the plywood end exactly half way across the joist so that the new plywood can start on this spot. 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. How far apart should floor joist be for a shed.

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. Measure and dry set the first piece.

Floor joist spacing has traditionally been 24 inches on center or from center to center of the joists. 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. However such construction used 2x6 t g or 1 and 1 4 plywood subfloor material.