![]() Since I plan on T&G 2圆 flooring for the loft floor (exposed to below), I think things would look much nicer if I have 4圆's spaced oc instead, possibly rough cut. You agreed that 2圆's would meet code, but I would have to have my " eyes wide open" to the fact that it would be flexy. ![]() Quote from: Don_P on April 16, 2013, 10:57:21 PMīut not in 4X center being equivalent to 2X center?Īs you may recall, I had to drop to 6" floor joists in order to meet the (somewhat arbitrary to me, but whatever) code requirement that 50% of my loft be greater than 7' in height. A live load only check should come out mighty close on deflection, the controlling factor in this type of member. a total load check will show mine conservative in deflection, you'll fail earlier on mine. You can run a check of that by opening the awc spancalc, run a scenario and then plug their design values into mine. Use the dimensions 3.5 x 5.5 and enter 1120 for the load, click "show result" and deflection will pass. However, the way deflection calcs are really done by engineers is to check deflection on the live load only not on the live + dead load. Use nicer, denser stock and the Fb and E numbers will go up a bit. You'll get a fail in deflection, one way is to bump the dimensions to rough sawn and it works. ![]() One of my calcs for this type of problem is here (won't mean diddly to an inspector) There is a 15% strength increase when members are spaced 24" or closer together that we can't take with widely spaced timbers. There is a flaw in my logic of a 4x center is equivalent to a ctrs.
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