![]() ![]() ![]() I didn't realize that the lumber yard could provide expert consultation in this way, so that suggestion was very helpful. I'd love to lower the foundation, but at what expense? ![]() Going lower on the foundation would have meant double the drilling since now I'm exposing more ledge area and it's more solid. Factory-sealed coating to protect against the elements during construction. Greater design flexibility than ordinary lumber. Design methodology used to develop tabulated spans is similar to that used in Table. Stable dimensions, consistent performance, and superior strength. That got me an extra foot in the basement, to a 7' ceiling if I used 2x8's for joists. Straighter wood that resists warping and shrinking. 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. in writing 6-when global lvl beams are used as floor joists, they shall be designed to meet recommended deflection and vibration criteria 7-unless otherwise indicated, tables are based on 'true' modulus of elasticity e 1. When we dug the hole, we hit ledge at 6 feet down. 5-do not drill, notch, cut or alter global lvl except as approved by lvl global inc. 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. Also see Assumptions for Table Development. For each application, a PDF download is available. He said that if I used a triple 12", then the floor would be perfectly stiff, but the double would be fine. Tables providing allowable floor loads (C D 1.0) and allowable roof loads (C D 1.15 and C D 1.25) for Southern Pine dimension lumber and Southern Pine glued laminated timber are detailed below. 3100Fb-2.0E 3 WEST FRASERLVL FACTORED RESISTANCES (STANDARD TERM) Design Property Depth 1. All 16 and greater beam depths are to be used in multiple member units only. Lateral support of beam is required at bearing locations. Said that if I put in a center post, I could stay with the 8", but I don't want that. Lateral support of beam compression edge is required at intervals of 24 o/c or closer. 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". Let's assume you have an LVL beam with a width of 5 inches, a depth of 12 inches, and it needs to support a uniform load of 1,000 pounds per square foot.I'm getting my materials from Hancock Lumber in Conway, NH. For joist clear spans between those shown, check minimum distance for both spans adjacent to that span, and use the larger distance.
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