I haven't seen any tables above 70PSF. Based on my calculations, a rain barrel full of water exerts about 168PSF. I live in the mountains in Colorado so I can probably expect additional weight in snow. Adding a 20% safety factor, puts me at a static load of 1.40PSI.
PI * (22.875" / 2)^2 / 144 = 2.85 SF
(55gal * 8.34lb/gal + 21.5lb) / 2.85 = 168.49PSF
168.49 * 1.2 / 144 = 1.40PSI
I realize that the qualitative details of this question might be better answered in an off-grid forum, but I need the table data, which I though someone knowledgeable of a reference would be easier to find in the forum.
