Plywood Floor Joist Spacing

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.

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. So how far apart should floor joist be for a shed. 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.

The answer is that it depends on several factors. 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. 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.

Floor joist spacing has traditionally been 24 inches on center or from center to center of the joists. Don t stack too much plywood on the same set of joists and overload them. A 3 4 inch sheet of plywood weighs approximately 75 lbs. For example in the 50 s and 60 s many homes were built with 4x10 joists at 4 oc.

However such construction used 2x6 t g or 1 and 1 4 plywood subfloor material. How far apart should floor joist be for a shed. Newer construction has floor joists spaced at 16 inches on center.