Plywood Floor Joist Spacing

Newer construction has floor joists spaced at 16 inches on center.

Plywood floor joist spacing.

For example in the 50 s and 60 s many homes were built with 4x10 joists at 4 oc. How far apart should floor joist be for a shed. Measure and dry set the first piece. A 3 4 inch sheet of plywood weighs approximately 75 lbs.

There is a picture of this below. 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. So how far apart should floor joist be for a shed. 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.

But larger is not always better when builders are constructing a home or adding a room addition. Don t stack too much plywood on the same set of joists and overload them. The vast majority of floor joist systems are built with 16 oc on center 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.

Floor joist spacing has traditionally been 24 inches on center or from center to center of the joists. However such construction used 2x6 t g or 1 and 1 4 plywood subfloor material. Your goal is to have the plywood end exactly half way across the joist so that the new plywood can start on this spot.