4 - 750's? Even in Aluminum that's a huge amount of weight! [Linked Image] If I absolutely had to go below those joists, I would've leaned towards 2 hole straps and lags, or even a solidly mounted piece of strut every 10'. That run seems like it would've been so much easier to put on top of the joists, then maybe screw 2 hole straps down...

Unfortunately, every rest home I've seen seems to suffer from 2 ailments. 1) Lowest bidder syndrome. 2) In-house maintenance-itis... [Linked Image]