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Concrete Pan Joist Top Slab Thickness

Concrete Pan Joist Top Slab Thickness

Concrete Pan Joist Top Slab Thickness

(OP)
This is a survey:  IBC Table 719.1(3) shows 4.6" thickness for 2 hour fire rating when using carbonate aggregate concrete.  Do you usually round this number down to 4 1/2" or round up to 4 3/4" or 5"?

RE: Concrete Pan Joist Top Slab Thickness

Up to either 4 3/4".

RE: Concrete Pan Joist Top Slab Thickness

Round up to 5".

RE: Concrete Pan Joist Top Slab Thickness

5" may certainly lead to less mistakes in the field.
However, that 1/4" of concrete can be a savings depending on the size of the building.

100'x200x1/4" is 15+ yards of concrete

50'x50'x1/4" is almost 2 yards of concrete

RE: Concrete Pan Joist Top Slab Thickness

I seem to remember the older UBC codes had 4 1/2".  I have designed numerous buildings using 4 1/2" for the thickness.

RE: Concrete Pan Joist Top Slab Thickness

1/4" of concrete, assuming $150 per cubic yard for concrete material (assuming finishing is a wash) amounts to about 12 cents per square foot to the building.

Meanwhile, the Interior designer is trying to decide between the quarry tile at $5.00/SF or the marble tile at $10.00/SF.

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