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Unread 02-24-2004, 09:41 AM   #1
sm
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Join Date: Feb 2004
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joist span

I have 2x8 floor joists on a 13 ft. span. I know this is to long of a span. A few people have suggested that I sister these joists with 3/4" plywood (cut to fit) in the midlle of the span and leave the ends unsistered. Can this work? The basement layout will not permit me to sister all the way across the joist and I really don't want to put up a beam or a wall b/c of the layout.
Thanks Again!
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Unread 02-24-2004, 09:54 AM   #2
bbcamp
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3/4" plywood won't be enough, unless you do both sides. However, you need to sister at least the middle 2/3 of the joist, or at least 9 feet. You could stagger the plywood so that you get the coverage you need.
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Unread 02-24-2004, 10:41 AM   #3
sm
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Uh Ohh! I did sister one side of my joist in the middle of the span with 3/4" plywood. On some of the joist I had to cheat to the back of the house a little b/c I have alot of duct work near my support beam. I guess I might have to build a wall after all.

One More Question Before I Do That:
My tiled area is 5x12. The 5ft starts at the back of the house and runs towards the middle of the span. This means that the tile will not be over ther middle of the span. Does this help my situation any!?

Thanks for the quick replies!!!
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Unread 02-24-2004, 03:03 PM   #4
bbcamp
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Sorry, no. The deflection criteria is a means to verify the stiffness of the floor. The actual deflection is of some small concern, but it gives a relative stiffness that is important. Your floor is relatively flexible, while tile likes relatively stiff.
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