GiFerro Posted October 13, 2009 Share Posted October 13, 2009 Now I make a very difficult question, how to calculate the size of the iron to be used for intermediate floors and roofs? you rely increasingly on calculations made by engineers or to make yourself at this calculation? Quote Link to comment Share on other sites More sharing options...
mike-hr Posted October 14, 2009 Share Posted October 14, 2009 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. Quote Link to comment Share on other sites More sharing options...
CBrann Posted October 14, 2009 Share Posted October 14, 2009 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 Quote Link to comment Share on other sites More sharing options...
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