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Floor Slopes in Structural Slabs

Floor Slopes in Structural Slabs

Floor Slopes in Structural Slabs

(OP)
I have a 7" main floor structural slab over 6" void form (no crawlspace required).  The interior portion of the slab is supported off a grid of cast in place concrete friction piles c/w drop panels.

Now, there are some areas that will require floor drains, and four finished sloping sides to each drain.  This results is a smaller slab depth, which theoretically reduces your "d" to a minimum at each floor drain location. (Assuming the slope is say 1-2%, that could result in losing 1-2" of depth at the drain area)  Is there some way of allowing the bottom of the slab to remain at a constant elevation and still design the slab to account for the floor slope?  

RE: Floor Slopes in Structural Slabs

Thicken the entire slab, using the min t at the drains.

RE: Floor Slopes in Structural Slabs

...what boo1 said,
OR,

...you could just require the preparation grading to slope with the floor slab and provide a uniform thickness.  With slight slopes like this, the rebar will simply turn and slope gradually with no specific bending required.

RE: Floor Slopes in Structural Slabs

Why the void space?

If it is needed because of potential soil swelling problems, you must maintain the 6 inch clear span below the plumbing lines, too...



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RE: Floor Slopes in Structural Slabs

Focht3 - cummon...you know that expansive clays just "gush" up around pipes  
...except in S.A. TX

RE: Floor Slopes in Structural Slabs

... and Dallas, Houston, Shreveport, Jackson, etc., etc.



Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora.

RE: Floor Slopes in Structural Slabs

Would the forming to a slope would cost more than extra inch of concrete?

RE: Floor Slopes in Structural Slabs

I wouldn't think so - at least no to any great amount.  Either way the contractor must set up vertical control and check the final elevations - one is dirt with no time crunch and the other is wet concrete that is rapidly setting up.

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