![]() I didn't realize that the lumber yard could provide expert consultation in this way, so that suggestion was very helpful. When sizing beams and headers, you need to have sufficient moment capacity (Fb), sufficient shear capacity (Fv), sufficient stiffness (EI) to satisfy the live and total load deflection criteria and you need to have adequate bearing sizes (Fci). VERSA-LAM ® cover veneer lumber (LVL) beams or headers eliminate twisting, shrinking and split, and deliver flatter, calmer floors both structures. I'd love to lower the foundation, but at what expense? ENGINEERED WOOD PRODUCTS (EWP) LVL SPAN AND SIZE CHARTS. Going lower on the foundation would have meant double the drilling since now I'm exposing more ledge area and it's more solid. That got me an extra foot in the basement, to a 7' ceiling if I used 2x8's for joists. I spent a week drilling holes (130) in the ledge and pouring in Dexpan to break it up to the point where a small hammer on a skid steer could bust it out. Blasting is not an option due to cost, and I doubt that any demolition person would do that when it's right next to another structure. When we dug the hole, we hit ledge at 6 feet down. I may keep the 8" LVLs and use them to stiffen the floor in the older section.Īs for "refusing" to drop the foundation, or raising the floor: It would be better to say I'm having to make choices. This will still be much better than the house I'm adding on to where the floors are carried by 2x8's sitting on horizontal 4x4's resting on piers every 6 to 10 feet. He said that if I used a triple 12", then the floor would be perfectly stiff, but the double would be fine. Structural Dindas LVL is engineered to perform in two complementary ranges, delivering softwood and hardwood alternative beam solutions. Said that if I put in a center post, I could stay with the 8", but I don't want that. ![]() To calculate the span of your LVL beam, multiply the depth of the beam (in inches) by this factor of 1.67. On longer spans the beam may require much more bearing space as indicated by this table. Here’s a handy rule of thumb: for every inch in depth, an LVL beam can span approximately 1.67 feet. Anything 5 and above we always at least double cripple. I dropped in on them this morning and after looking it over and doing some calculations, they said I needed to swap out my 8" LVLs for 12". According to the 2012 IRC codes any beam, joist, or header shall never have a bearing of less than 1 1/2. ![]() I'm getting my materials from Hancock Lumber in Conway, NH. ![]()
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