I was recently asked to stiffen an existing floor system. They are planning on adding expensive tile, and are worried about cracking. The floor framing is 2x10 joists @ 16" o.c. with 1/2" and 3/4" sheathing spanning 15'3" and are way under for deflection. The product specs recommend l/720 to eliminate any cracking, which is difficult given the span and crowded nature of the basement (increasing depth would be difficult with wiring and duct work). Sistering on one or both sides does not meet the deflection criteria. Any recommendations on stiffening the floor, or avoiding tile cracking?
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