Cold Plunge Tub over Joists

[AndersGeo]

I'm Geotech, and I am sadly struggling to determine if the current joist size and spacing is adequate for a cold plunge tub. The cold plunge tub is large with a 37" diameter, weight of 250lbs, and 130-gallon capacity. I estimated about 200 psf load. The current beam under the joist are 6x12 at 7.25' OC spacing. The doug fir joist (wash st) are 2x10 at 16" spacing over the beams. The tub would be positioned at the end of the joist near the beam. The moment shouldn't be too large, but I thought the shear might be too high. What do you think? I was thinking of putting another set of 2x10 for insurance under the tub. Thank

 

[EngDM]

Draw a sketch, follow the load paths. Use FORTE to help give you insight on sizing the joists and beams, it is very simple to use.

 

[Ron247]

Are you saying the 2x10s at 16" oc are only clear spanning 7.25' or less from 6x12 to 6x12; or are you saying the span of the 6x12 beam is 7.25' from column/wall to column/wall?

You may need to provide a sketch.

 

[AndersGeo]

Are you saying the 2x10s at 16" oc are only clear spanning 7.25' or less from 6x12 to 6x12; or are you saying the span of the 6x12 beam is 7.25' from column/wall to column/wall?

You may need to provide a sketch.

The 2x10s are spanning 7.25' from 6x12 beam to 6x12 beam.

 

[ChorasDen]

Agree on a sketch. What is below this area?

Just because you are in Washington State does not necessarily mean that joists are Douglas Fir, they could just as easily be Hem Fir or even SPF. Best to pop the ceiling and take a look to confirm the grade stamp and species.