Expert: Bruce E. Johnson - 2/24/2009

Question
My question is similar to one you answered in 2006 so I will use that format.

I'm in the midst of a 2nd floor Master bath remodel on a 25 yr old home in Virginia.  I plan to install a whirlpool tub.    According to the specs on the model, it requires a minimum of 59lb/sq ft loading on the flooring.  The floor joists are 2x10 with 16" centers, spanning approximately 10 feet, and are most likely southern pine.  Two main joists directly below the tub installation will carry most of the tub/water/bather weight, aside from normal wall/floor buildout.  Is this configuration sufficient for the requisite loading, or will they require reinforcement?

Answer
Hi mark, if you go to the following link :http://www.southernpine.com/spantables.shtml
and check on table #4 for 60 pound live load it will take you to a pdf file.  Looking down this table you come to 2x10 at 16" spacing.  Most floor joists used in standard construction are #2.  So based on the southern yellow pine index your joists are good for up to 13-7 span at the 16" spacing and a 60 pound live load.  Even if they are a #3 grade (which would be unusual) they can still span the 10-0'.  So based on this it looks like you are okay.  I am not an engineer and any advice I give is based on field work.  I hope this information helps feel free to write again regarding this or other matters, sincerely, bruce e johnson..bejohnsonconsulting.com