Thanks Jake, a second pair of eyes is a good thing. Here are my calculations, let me know if I'm forgetting something.
Roof sheet metal is 20 ga, 1.5 lbs per ft2.
I'm raising 25 ft. Total ft2 is 25' x 9' = 225 ft2 x 1.5 lbs = about 340 lbs
U Channel support 16 ga, 2.5 lbs ft2.
U Channel is 6" total width x 9' accross = 4.5 ft2 x 11 support = 50 ft2 x 2.5 lbs = 125 lbs
So my total weight will be around 500 lbs.
There are cross members that are about and inch square and the emergency exits. So for caution I saying around 700 lbs. That would put 175 lbs or just under 200 lbs on each Ram Support.
I found the safe working loads for bolts here.
Bolt NF Thread Grade 2 Iron Bolt
Diameter Shear Shear
(inches) (at thread root) (Full Bolt)
1/4 200 370
5/16 340 575
I have two bolt on each Ram Support.
Let me know where I went wrong before the roof collapse on me when I raise it. I don't want any monday morning quarterbacking here.