Floor Deflection for Comfort and Sections of Tile
I am working with the engineer to finalize my new house plans and am trying to sort out how far above code we need to be to get a tight floor and to properly support tile in bathrooms and the mudroom. Please note that all the floor joists in this house will be 11 7/8″ TJIs and right now the maximum joist span is around 17′.
I understand that L/360 will meet code but may not feel solid and may not be ideal for tile sections. I also understand that within a set joist depth that I can reduce deflection by reducing the spacing and upgrading the grade of the TJIs. I also understand that we can design to L/480 or above.
Given this information, what is the best way to quantify a “stiff” floor? for example, will L/480 result in a stiff feeling floor? Is there a guideline for staying a certain % below max spans listed on TJI tables that will give a stiff floor? Would my tiled sections need to be even stiffer?
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