Howdy, making a header out of 3 lvls 1 7/8' by 18" by 15' am wondering what the loading is in pound per lnft? Is it 3 times what one 17/8" 18" by 15' one is?
Here is another question an 11 foot span made up of 3 2by10" supporting a plaster ceiling, second story outside floor, another plaster ceiling ,attic,and hip roof ridge is 23' above the attic floor. The room is 15' wide total width of dwg is 30'. This under engineered beam has held up for 105 years. So to beef it up i installed a 2 by 6 plate then 3 glued and nailed 1 7/8" by 11 7/8''lvls directly below the old beam. But am wondering does putting one beam under the other double the loading ability of the new mega beam? I have it figured to be bearing including snow load 2930 psfx per LnFt .