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Old 07-29-2015, 11:16 AM   #1
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New Bath in Old House-Tub Support-Add Floor Joists???


We have a 1940 home with floor joists that are 2x10s and 16 inches on center. We are replacing the old bathroom that contained an iron tub that was 30x59 with a new fiberglass/acrylic tub that is 36x72 (weighs 141 lbs) and holds 89 gals of water (est 1577 lbs). My spouse is 6'3" and weighs about 280 lbs. My estimate is that we need to support 1999 lbs of weight. The tub alcove is in a corner on two exterior walls. The sub floor will be 3/4 tongue/groove flooring plywood.
Where do I go and how do I determine if additional floor joists are needed? How many? Where to place them? The kitchen below my bath has been gutted, so I have access to the structure from the kitchen ceiling. There is a load bearing wall on a steel beam in my kitchen, but in this bath area above, the joists do not sit on it The joists in this area would need to sit on one exterior wall and the other end would sit on an interior wall, (not on the steel beam) that wall is sideways (2in thick wall instead of 4in) 2x4s, but that could be beefed up with larger wood supports.
I do have a contractor doing this work, but I am a paranoid tech product manager type, so I feel compelled to try to figure this out and there compare what I can learn/determine with what the contractor wants to do.
I appreciate any help and advice! THX!
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Old 07-29-2015, 12:16 PM   #2
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An engineer will be along soon---
To get a good answer--how long are these 2x10s?

I'm guessing that you are going to be fine as is---but we will get an answer soon enough.
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Old 07-29-2015, 12:29 PM   #3
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How did you get your weights? Gallon of water weighs 8.34 pounds or 750 pounds for 89 gallons.
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Old 07-29-2015, 01:22 PM   #4
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Thanks!


I used an online tool for the water weights. Thanks for the info! I can recalculate using 8.33 lbs per gallon. It really helps. I am down to 1167.37 lbs.
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Old 07-29-2015, 01:51 PM   #5
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More info...


The joists in the area where the tub is are about 8 ft long, but there are stairs at the interior wall where they end. We have stairs that go straight up to landing and then turn right and go up 3 more steps. The bathroom is to the left of these stairs on 2nd level...so I suspect that these joists end in the stair framing.

Thanks so much for the correction on the weight of water! Fat fingering excel again! I am now down to 1163 lbs.
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Old 07-29-2015, 02:04 PM   #6
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Others here can help much better about your structure. Just like everything else verify first and good luck
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Old 07-29-2015, 02:11 PM   #7
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If the stairway opening is framed correctly--
2x10s--16" centers--8 feet long--the deflection is 1389---
Plenty strong enough to support a tub and a huge human being---

360 is the code minimum--and will support ceramic tile--720 will support natural stone---1389? Plenty for your needs---

An engineer will be along soon---Mike----
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Old 07-29-2015, 04:27 PM   #8
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Thank you!
The huge one played college ball on fake turf and needs to soak just about everything. If it is really hot and humid, we all get in the dog pool. Spouse says it reminds him of post game ice baths. If you have something surgically repaired, you really need to be able to soak it in hot water to get through physical therapy. I am the non-jock and I had had 9 ortho surgeries.
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