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Unread 07-08-2021, 11:00 AM   #16
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I've created a new image, as we are still considering tile.

Would creating a support wall beneath the joists ( in the lower half of the kitchen ) mitigate the deflection enough for tile? My only concern is the north side of the ibeam doesn't have enough space to erect a new support wall. This would be in addition to fastening the overlapping joists above the beam + 3/4" plywood that does not meet over the ibeam + Ditra.
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Last edited by Chibo22; 07-08-2021 at 11:35 AM.
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Unread 07-10-2021, 06:32 AM   #17
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Your proposed support wall would indeed do the trick in reducing deflection, and you don't even need to place it in the center of the span to achieve L360, which will allow you some flexibility.

Not sure what you mean about your "concern"...
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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Unread 07-10-2021, 07:55 AM   #18
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Your concern is valid, Chibbo. If you correct your joist deflection on only one side of the support beam, you still have the problem on the other side. As I've stated previously, you may not actually have a problem there depending upon the species and grade of your joist material. You hafta determine what you're comfortable tiling over.

As for your "future" support wall, if you don't install it before you tile that floor it doesn't count. Installing it later is more likely to cause a problem in your tile installation than to prevent one.

My opinion; worth price charged.

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