[b]Structural Gypsum Roof Panel?[/b]
[b]Structural Gypsum Roof Panel?[/b]
(OP)
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.






RE: [b]Structural Gypsum Roof Panel?[/b]
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RE: [b]Structural Gypsum Roof Panel?[/b]
Do a web search for reinforced gypsum concrete suspension system. Gypsum concrete is calcium sulfate mixed with water.
RE: [b]Structural Gypsum Roof Panel?[/b]
I also uploaded this PDF file to engineer.com (first time I've tried this, let me know if it works).
RE: [b]Structural Gypsum Roof Panel?[/b]
RE: [b]Structural Gypsum Roof Panel?[/b]
Or it could be a Tectum board system (http://www.tectum.com/roofdeck.htm)
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: Capacity of a gypsum roof
RE: [b]Structural Gypsum Roof Panel?[/b]