3 1/2" Precast Gypsum Slab

[JPSAMUEL]

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

 

[bones206]

I think that is part of a roof system with steel bulb tee sub-purlins.

 

[cec17]

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.

Internet Archive: Digital Library of Free & Borrowable Texts, Movies, Music & Wayback Machine

archive.org

Pyrobar Reinforced Long Span Hollow Roof Tile : United States Gypsum Co. : Free Download, Borrow, and Streaming : Internet Archive

Trade catalog, Text, Illus, Photographs, CCA ID:89-B3613, ca.1920, 4 p, 28 cm

archive.org

 

[JPSAMUEL]

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

 

[bones206]

I would attach some pdf's I have, but it says I'm exceeding the file size limit. Try this link: https://files.engineering.com/downl...5286-4617-9407-334609868578&file=gyp_roof.pdf

 

[JPSAMUEL]

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.

Internet Archive: Digital Library of Free & Borrowable Texts, Movies, Music & Wayback Machine

archive.org

Pyrobar Reinforced Long Span Hollow Roof Tile : United States Gypsum Co. : Free Download, Borrow, and Streaming : Internet Archive

Trade catalog, Text, Illus, Photographs, CCA ID:89-B3613, ca.1920, 4 p, 28 cm

archive.org

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

 

[bones206]

Here’s a link to one of the pdfs that I wasn’t able to upload: https://iibec.org/wp-content/uploads/2015-12-hogan.pdf

Does it resemble any of the products from that article?

 

[bones206]

This has some plank data at least. Not 3.5” but should give you an idea.

USG technical information 1956. : Unites States Gypsum Company : Free Download, Borrow, and Streaming : Internet Archive

1 v., ill., 28 cm., trade catalog

archive.org