This is the material you will stand on, while walking
around on a wood framed floor system. Sheathing is often referred to as
underlayment. Most home builders use plywood or oriented strand board
for sheathing. The picture below provides you with an excellent example
of diagonal 1 x 6 sheathing, that was used in homes before the 1970s.
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Floor Joist Layout Problems Create Sheathing
Problems
Make sure that you spend enough time, planning your floor joist layout
correctly. A correctly laid out floor joist framing plan can reduce the
amount of sheathing waste and time spent installing it. 16 inch on
center measurements work great for sheets of plywood or oriented strand
board that are 8 foot long.
You can also use 24 inch on center floor joist layouts, but you will
probably need to increase the thickness of your floor sheathing. 16 inch
on center floor joist measurements and 3/4" plywood, usually provide you
with sturdy floors.
What's An On Center Measurement?
This would be the perpendicular distance from one floor joist to the
next one. For example if you installed one floor joist that ran parallel
to the right side of the building, you would continue to run the rest of
your floor joist parallel to the right side, spacing them 16 inches
apart, until you worked your way to the left side of the building.
You wouldn't actually be spacing them 16 inches part, because you're on
center measurements are from the center of each floor joist to the
center of the next one.
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