2' on center floor trusses

Old 04-19-07, 02:55 PM
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2' on center floor trusses

I have a home with floor trusses that are laid out 2' on center with a 3/4 inch subfloor. I would like to lay ceramic tile on this floor but everthing I read says that the floor joists should be 16" on center. The floor trusses are 12" deep and span 13'9". Is this floor just to flexable to install tile even if I put down a 1/2" of hardibacker board on top of the subfloor?
Old 04-19-07, 03:12 PM
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It isn't the span of the trusses that are the problem. They can handle the load with acceptable deflection on that span. The plywood, however, will have excessive deflection over the 2' span. Hardibacker is not structural and will do nothing to limit the deflection. An additional sheet of 1/2 ply glued and screwed at a right angle to the subfloor would do the trick. Make sure to break the seams on the trusses.

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