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  1. R

    Calculating joist strength

    Hi Nestor The idea of using steel is a good one. There are only two drawbacks that I can see and they are weight and cost. Each 13'-6" peice of 5/8" X 3.5" steel weighs 100lbs and I haven't priced the steel yet ( I will ) but I think that it will be quite expensive. If the wood sandwich floor...
  2. R

    Calculating joist strength

    Thanks very much Nestor for your reply. I was having trouble understanding the formulas and you explained them really well to me. Because of conflicting opinions I hired an engineer to do an analysis of different floor systems. The top choice was a 2by4 on flat glued and screwed to the existing...
  3. R

    Calculating joist strength

    Hi Travelover Thanks very much for your reply. I hired an engineer and he said that a 2by4 on flat glued and screwed to a 2by4 would form a Tee. On top and bottom of the Tee 5/8"T&G Fir Plywood would be glued and screwed and that would be a strong enough floor system. The deflection would only...
  4. R

    Calculating joist strength

    Hi everyone this is my first post. Is this true? "bending goes by power of 3, so a 2by6 is 1.6 times thicker than a 2by4 so its going to bend 4X less. Also a 2by8 on edge can carry more than a 6by6." That info I found on the internet but I lost the site and I have been searching and searching...
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