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RE: Thickened Floor Slabs

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The wall loadings are essentially a line load concentrated only with respect to its width. This loading normally produces tension on the bottom of the slab. The tensile stress per se will control the concrete’s thickness for a constant thickness slab.


Like you said you checked its thickness, for the given wall loads based on and to satisfy the punching shear stress, and found it to be ok. My opinion, based on experience with such a case, is it may be theoretically ok but the slab is quite thin. The wall is 6-in thick and 14-ft high; this makes quite a considerable linear load. It would be prudent to thicken the slab by following the “classical details” to avoid any problem in future.




Syed Faiz Ahmad; MEngg, M.ASCE

Senior Structural Engineer

Saudi Oger Ltd

Riyadh, Saudi Arabia

-----Original Message-----
From: Lester Unger [mailto:lesterunger(--nospam--at)]
Sent: Tuesday, October 07, 2003 6:39 PM
To: seaint(--nospam--at)
Subject: Thickened Floor Slabs


What factors do I need to look at for 6" interior non-bearing masonry walls on 4" floor slabs on grade? My company had some typical details of thickened floor slabs under all 8" and 6" interior masonry walls. We no longer use these details. Typically we put all 8" walls on wall footings and 6" non bearing walls on 4" slab on grade. I checked the floor slab as if it were a footing and found it to be OK with a 6" cmu wall 14' high on it. The construction manager is insisting on the thickened floor slabs at the 6" walls. I don't feel these are necessary. Comment would be appreciated.


Thank you.

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