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

[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]

Check out / google "gypsum bulb tee" roofs.

link 1

link 2

RE: [b]Structural Gypsum Roof Panel?[/b]

It may be Gypsum fiber concrete.  

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]

(OP)
This appears to be exactly what we have, thanks so much guys.

RE: [b]Structural Gypsum Roof Panel?[/b]

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 (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]

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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