[TheForge] Wooden Beam strength for Rigging

[Woolley]

Greetings,

I seem to remember a thread about beam strength a while back but don't have any info.  I'm not sure if this is the right forum but here goes.  I want to hang small steel I beams(6"?) under my roof joists to rig from. I'm hoping to get up to 1/2 ton or so capacity.  The beams measure 3x11 1/2 with no room above (obviously butt up to roof deck), so I have to drill to bolt through or lag in to hang straps down and under to support steel.  The joists are spaced 2 feet apart. I hope to span at least 5 or 6 of them. Does anyone have a known reference for engineering specs on this or any practical experience doing something similiar?  Any help would be appreciated.

Regards,
Bill Woolley