Understanding Concrete Framing Slope Annotation

[IanVG]

Good morning all - I'm trying to figure out slope for a concrete lab on composite steel deck. I've got the following drawing which appears to show that the elevation at the drain is 1' higher than the elevation at the "high" point of the slab. What am I missing here? Based on the description of the slab, 5-1/4" is the minimum slab thickness so that would mean that the low point is at the spot elevation calling out 5-1/4", correct?

Oh! And you can attach pdf's to posts now! I'm also attaching the whole sheet, because it helps to see everything at once.

 

[HDStructural]

That's weird. I am seeing what you are seeing. Are you sure that the circle is a drain, and not the intersection of the sloping concrete lines?

 

[IanVG]

I am positive that circle is a drain, because the plumbing plans indicate they are hub drains that are connected to sanitary sewer lines.

 

[XR250]

Does not make sense to me either

 

[IanVG]

Alright I suppose it is a mistake! Thanks everyone for your help. It's frustrating to get hung up on details like this when I trying to re-create a slab plan in Revit.

 

[phamENG]

Looks like an error in the drawings. Only way to know for sure is to go out and measure.

 

[JAE]

If it's an error on the plans it appears to be all over that floor framing plan. All the drains are at 6 1/4" with nearby 5 1/4" elevations.

 

[BAretired]

Looks like the section numbers have changed. Sections A and B appear to be typical (my guess).

 

[BAretired]

It seems to me that the typical finished floor is at 7.25". Where there is a cross, the floor slopes down to 6.25", or possibly 5.25"...does it really matter?

The red arrows are my guess at the fall lines of the slopes in the area of interest. Some of the elevations appear to be incorrect.