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I Forge Iron

calculate the resistance of iron


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I can't make anything like that without an engineers stamp of approval on the blueprint. They take into account roofing material, snow load, earthquake zone, etc. and then multiply by a magnitude for safety. I would like to say, now that it's mentioned, that engineers, at least around here, are either scared of liability, or have forgot how to run calculations. A couple weeks ago I made some steel posts to hold a laminate beam for a roof support on a small cabin. 3x3 inch tubing would have been just fine, but the engineer spec'ed 5x5x.375 inch square tube, with 1 inch thick footpads and 3/4 inch bolts epoxied 18 inches into the foundation. The four posts were between 6 and 10 feet tall. Almost popped the guts on the carpenters that installed them.

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depends on if you plan on 2 dozen elephants tap dancing on the roof. I get the idea of safety factor, plus over building for the future unpredictable..... but that seems a bit much even for that...

I used to deal with micro lams a lot, biggest one was about 18" tall by 3 1/2" thick, by 32 feet long... almost killed us to get that in place... no steel posts to hold it up though... just triple 2 x 10..... but that was 10 years ago...

cliff

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