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RE: Thickened Floor Slabs 2

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The problem we have seen with thickened slab under masonry is that when the slab on grade joints are cut perpendicular to the wall they will crack under the wall.  This crack can reflect up the wall.  For typical CMU construction it's probably not a big deal.  If you have glazed tile on the wall then it can be very unsightly.  It's hard to explain to an owner that the very visible crack won't hurt anything.  I usually have the top of the footing 8" below ff and then have a single block on the footing that will serve as a screed surface and also creates  joints in the long direction.  The wall builds up from there.

John C. Jones, PE
Barnett Associates
Pell City, AL
205-884-0099 (fax)

-----Original Message-----
From: Lester Unger [mailto:lesterunger(--nospam--at)]
Sent: Tuesday, October 07, 2003 1:09 PM
To: seaint(--nospam--at)
Subject: Thickened Floor Slabs 2

Thank you for the responses. It seems unanimous and logical to use a thickened slab. How many are using the same logic for 8" non bearing cmu walls? Using thickened slabs for 8" walls instead of wall footers would be very cost effective.

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