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Old 07-14-2012, 07:01 PM   #1
The Kid
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slab shower dead load concerns

I have a bathroom coming up that I will do the prep work for a fabricator. My work will include install cbu, mud pan with linear drain, float tub deck for undermount tub, tile floor and shower pan.

The fabricators work will include fab and install 2 shower walls (5'x8'), tub deck (40"x8'), tub splash (16 lf x 12"), tub skirt (20"x 8'), vanity tops (12lf x21") all in 3cm material.

My concern here is creep deflection on the wood frame floor with all the weight of the stone. Any enjineers out there care to comment on this? The joist are 2"x10" with the span being unknown at this point. Am I asking for it if I tile this floor?
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Old 07-14-2012, 07:10 PM   #2
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Maybe,have you checked the floor structure on the DEFLECTO above?
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Old 07-14-2012, 07:23 PM   #3
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most buildings are designed for a load of 40 lbs/sq.ft. That adds up to about 4000 lbs for a 100 sq. ft. bathroom. If you add up all your rock, finishes, and a large tub full of water, you will be getting close to that. IMO it's worth mentioning your concerns to the homeowner and see if they want to pay for a consult with a building Engineer, or at least a master carpenter.
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Old 07-14-2012, 07:28 PM   #4
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Good questions. Got a drawing?

edit: 40 lbs/sqft dead load or the whole building, Peter? Around here, typical minimum design for residential floors is 10 - 20 lbs/sqft dead load, depending on the room, with 40 lbs/sqft for live loads.
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Old 07-14-2012, 07:41 PM   #5
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Not close to enough information there, Jeremy.

But based upon what we've got I'll say it'll either be OK or it won't. But that's just a guess.
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Old 07-14-2012, 07:47 PM   #6
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That's the kind answer I like, CX. I concur.

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Old 07-14-2012, 11:19 PM   #7
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Old 07-14-2012, 11:59 PM   #8
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The deflecto rates the floor at around 588, so were good there. However, im concerned how the unaccounted weight might affect this floor over time.

Thanks for stating the obvious Kelly.
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Old 07-15-2012, 08:06 AM   #9
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Always glad to help, Jeremy.

It's really just a basic math problem, but you gotta fill in all the numbers to complete it. It's not complicated, but it's not anything any of us can see from out here, eh?
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Old 07-15-2012, 12:36 PM   #10
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An engineer will want a drawing with some/all of this stuff - joist specie, grade, size, spacing, spans; locations of bearing walls below; weight/sqft of stone; size & locations of all stone; floor tile install method & weight/sqft; tub location; anything else that adds to floor/wall loads; etc... you know, all the usual stuff.

My local engineer will do these for me quick & often free with nothing in writing. For signed, stamped paperwork he'd charge the minimum - usually 100-150. Whether i get something in writing often comes down to my comfort level with what he says.
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