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Unread 08-23-2019, 08:24 AM   #1
Ken C.
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Stone Wall on 11 7/8 Joist

I want to add 2500 lbs of stone/mortar to a 14 foot wall on 11 7/8 engineered joists offset 4 feet from the load bearing wall below. The span below is 18 feet. The wall crosses 12 joists with 16" on centre. Is this doable?
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Unread 08-23-2019, 10:14 AM   #2
Elkski
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I think you're going to have to talk to a structural engineer on this one
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Unread 08-23-2019, 01:07 PM   #3
John Bridge
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Hi Ken,

It sounds like it'll work. I am not an engineer, though.

How much does the wall weight now?
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Unread 08-24-2019, 04:25 AM   #4
Ken C.
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Thank you for the reply John. The wall weight I'm not sure, 2X4 studs, 1/2" plywood, 6' pine slab floating shelf. I'll guess about 300 lbs. The 2500 lbs I quoted was a higher than calculated figure as well. I have 126 sq. feet of wall and I weighed 1 sq. foot of the stone I cut from a cliff near my home at 12.5 lb. That would give me a bit of leeway with the weight quoted for mortar.
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Unread 08-24-2019, 07:47 AM   #5
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That’s a big span for such a significant load over a concentrated section. I’d give the joist manufacturer a call to get their recommendations before proceeding. What type of flooring is in this room?
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Unread 08-24-2019, 09:21 AM   #6
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FWIW, if the design total load for the floor is currently 50 psf (40 psf live plus 10 psf dead), then the current maximum moment demand on a joist is 2700 ft-lbs [0.5 * 9 * 9 * 50 * 16/12].

If you add a 200 lb point load to a joist, 4 feet from the end, the maximum moment demand goes up to a bit over 3100 ft-lbs. [The gain is a bit over half of 4 * 200.] That would be about 15% higher.

So you need to find out if there is currently sufficient overcapacity for the increased demand. That means finding either the original engineering for the floor joists, or determining the manufacturer and model of the joists, and checking their literature for the joist capacity, and also determining if 50 psf is the correct current demand.

Cheers, Wayne
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