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[b]Structural Gypsum Roof Panel?[/b] 6

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Einsteim

Einsteim

Structural
Jan 10, 2008
76

Does anybody have information or a source regarding what appears to be a gypsum based structural roof? I visited a building today that has this type of roofing material with wire reinforcing embedded about a 1/3 up from the bottom...it appears to be around 3" thick. They may be prefabricated roofing panels. It spans roughly 1'-9" with embedded purlins. It has some sag that is quite evident. This building is likely 100+ years old. I have attached a picture from the underside.

The contractor wants to place a RTU that will add point loads AWAY from the steel trusses and directly on the gypsum material. I am not going to allow this, but thought maybe somebody would have some information on whatever this is ans some type of allowable loading information.
 
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It may be Gypsum fiber concrete.

Do a web search for reinforced gypsum concrete suspension system. Gypsum concrete is calcium sulfate mixed with water.
 
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Try the gypsum association ( I contacted them about gypsum roof decks and I was e-mail a brochure from 1973 for this type of roof deck. It contains properties, load tables etc.
I also uploaded this PDF file to engineer.com (first time I've tried this, let me know if it works).
 
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This appears to be exactly what we have, thanks so much guys.
 
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It looks like a system that uses steel bulb tees spaced out, then a 5/8" gypsum board (or something like that) then a poured gypsum topping.

Or it could be a Tectum board system (
The gypsum topping used to have a product called Zonolite (I think) - that had asbestos in it.

Also, here is another thread that is similar to your question:

thread507-84338: Capacity of a gypsum roof
 
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It is not Tectum or Insulrock, the two most common gypsum decks, because they are very fibrous in appearance. I agree that it is gypsum board form on bulb tees with poured gypsum topping.
 
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