Bulb tees

[SteveMort]

I am trying to gather information on the capacity of an existing roof system. The 1965 drawings call for the following roof system to span 8'-0" between joists: ". . .2" gypsum deck with 4x8-12/14 W.W.M. on 1-1/2" insulation foamboard and #228 bulb tees at 33" spacing"

Does anyone have any literature about this system type?

 

[Ron]

Do a search in this forum. The question has been answered several times with links or attachments for info.