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3 1/2" Precast Gypsum Slab

JPSAMUEL

Structural
Oct 21, 2013
7
CA
Hi All,
I came across a drawing from 1923. The roof framing consists of "3 1/2" Precast Gypsum Slab", 16" wide and spanning 6 feet.
Does anybody can guide me to a catalogue or published values for these 1920's slabs?
The slab does have some rebar.
Any help is really appreciated.
Thanks,
JP
 
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I have seen this stuff "Pyrobar" on some buildings in the midwest. It is old hollowcore plank, different from the poured gypsum / bulb tee system that @bones206 appears to be referring to. A couple of references worth digging through below.


 
I think that is part of a roof system with steel bulb tee sub-purlins.
Hi bones206,
The purlin is a I section. The slab seems in a perfect condition from below.
Attaching an original drawing from 1923.
Thanks,
JP
 

Attachments

  • Extracted pages from Original Drawing.pdf
    955.5 KB · Views: 5
I have seen this stuff "Pyrobar" on some buildings in the midwest. It is old hollowcore plank, different from the poured gypsum / bulb tee system that @bones206 appears to be referring to. A couple of references worth digging through below.


Thanks cec17...good read. I am trying to find published values for 3 1/2" solid slab.
 

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