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Old Joist Type

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I need to determine joist property with following members.
Top & bottom chord: W shape, 5- 1/2"x1".
Digonals 1" diameter pipes, crimped at panel points., 30" c/c panels 
points, no verticals. About 30" jost depth, 40' joist span, 5'-0" o/c 
spacing, Roof joist.

It appears propriety shape, not listed in SJI 60 year manual.
Anyway to locate manufacturer to determine proprties.

Dilip Patel, PE

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