3" Thick Precast Roof Deck circa 1957

[Deadblow]

Hello,

Is anyone able to help me to identify what the precast roof panels are in the attachment? They are 18" wide and 3" thick and contain some welded wire reinforcement as can be seen in the attachment. There is some sort of 1/2" thick fiber board on top of the panels and then rubber roofing. The structure was built in 1957.

I would love it if someone could identify this system so I know what it is called. Ultimately, I need to determine an estimated dead load. If I use 145 pounds per cubic foot density for concrete, the steel joists are completely maxed out, which is indeed possible.

At first I was thinking that the system was a poured gypsum roof deck, but after seeing it in person, it seems like concrete. Any thoughts?

Thanks!

EIT

 

[Ingenuity]

It may be PYROBAR precast gypsum roof system, by US Gypsum - they manufactured 12" and 18" wide units in both solid and hollow-core, up to about the 60's. Reinforced with mesh/fabric.

What is the spacing of the steel joists//trusses (span of the panels)?

I may have some product data I can dig out.

 

[Deadblow]

Ingenuity,

Thanks for the suggestion. The steel joists are 3'-0" o.c. I would appreciate any product data.

EIT

 

[bridgebuster]

Deadblow,

Go here

Link

This is a website with 1000's of old catalogs. There is some info on Pyrobar.

 

[Deadblow]

Bridgebuster,

Thanks for the link!

Just in case anyone was wondering, I was able to take a sample of the deck and have determined that it has a density of about 50 pounds per cubic foot.


EIT

 

[bridgebuster]

you're welcome. It's a great website for researching historical products.