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For design reasons my wife would like me to span 20 ft. without increasing the floor thickness. I know that nothing in the UBC will allow it, but I’m wondering if there is a creative way to do it. I was thinking of 8×8 white oak backed up by a piece of 8×1/4 in. plate screwed to it, say ten inches on center. The price isn’t the issue, 8x8x20 would only be $30.00 I haven’t checked the price of steel but that shouldn’t be an issue. There would be a bedroom above so I could get by with 30# live loads, 10# dead load 360 deflection. The most span I can find for a 2×8 12″ o.c. select structural fir is 15’7″ I know this is one where I’ll have to get an engineer to sign off on but I’d rather find out if it can be done before I spend money finding out it can’t be done.
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For design reasons my wife would like me to span 20 ft. without increasing the floor thickness. I know that nothing in the UBC will allow it, but I'm wondering if there is a creative way to do it. I was thinking of 8x8 white oak backed up by a piece of 8x1/4 in. plate screwed to it, say ten inches on center. The price isn't the issue, 8x8x20 would only be $30.00 I haven't checked the price of steel but that shouldn't be an issue. There would be a bedroom above so I could get by with 30# live loads, 10# dead load 360 deflection. The most span I can find for a 2x8 12" o.c. select structural fir is 15'7" I know this is one where I'll have to get an engineer to sign off on but I'd rather find out if it can be done before I spend money finding out it can't be done.