![]() ![]() Protect yourself, get the professional services, it's $ well-spent. This is typical of what they may find: contractors substituting cheaper fasteners or structural materials which are not rated for the level of weather exposure or load can cause the entire load-bearing system to fail, possibly with tragic results. In the event of a failure of a structural component, the plaintiff attorneys supoena the design documents, including the plans review, the inspections, product approvals for the components right-down to the fasteners, and then a forensic engineering team reviews them with compliance to the building code at the time of construction. I am a plans examiner and a Life Safety Code inspector, and I've seen a lot of stupid, dangerous things done by amateurs and professionals. Considering what's at stake, you don't need a catastrophic failure so using the services of a structural engineer is a matter of safety for you and anyone around the structure. Yes, you may be able to use the free design skills of your local supply store, but here in Florida, you don't get a permit for structural work like that without having a professional engineer (P.E.) submitting sealed plans for the structural calcs. Table capacity values based upon a buckling length coefficient, K e, equal to 1.0 (rotation free, translation fixed at each column end per NDS Appendix G). I adapted a 'cherry-picker.' I'll post that up in a new thread. If floor joists are not continuous above the beam, take the sum. A 3-ply with 2 X 10s would mean that three 2 X 10s are. It also shows the maximum that the beam can span for various numbers of such pieces of lumber built together (this is indicated by 3-ply, 4-ply and 5-ply). I even went as-far as-to buy a short-web I-beam with the idea to bolt it to the underside of the box beam at the ridge, but I discovered that between the I-beam girder, the trolley, and the rigging, I would lose precious headroom, and be unable to lift much over 3' in height onto the loft deck. Table is based on continuous floor joist span and simple or continuous beam span con- ditions. This span table excerpt shows two possible sizes of built-up floor beams (2 X 10 and 2 X 12). If it was an I-beam girder I could use an overhead trolley on the lower surface flange of the beam, but due to the box construction, that was out. One concession I made to getting heavy things up & down to/from the loft, I thought about what would make an easy load-lifter? The roof ridge beam is also a 1/2" wall thickness box beam with plates welded to it for the ceiling joists. For access, I use an A-frame ladder, but since it's used for storage, it's not an everyday trip I make. The structure has no stairs to access the loft, not-even an attic 'pull-down' stairs. The beam is sandwiched on both sides by a 2" x10" (ripped to 8" to match the box beam dimension) wood beam to allow easier attachment of the loft floor joists, which are 2" x 8" & 18" o.c. Beam span maximums are based on a maximum. Fewer posts on upper-level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans. The engineer did the calcs and gave us a front-of-the loft steel box beam, 1/2" wall thickness, 4" x 8" welded into steel flitch plates cast into the masonry side walls. The span of a beam is dependent on a few variables: The grade and species of lumber, size of lumber and the load it carries. We used a structural engineer, and I asked for a capacity capable of supporting the weight of multiple motorcycles. The garage is a nominal 20' x 22' & the loft is a nominal 13' x 22'. That's all we could afford to do, we kept the same roof instead of bumping it higher. It is crucial to consult LVL beam span tables during the design phase to avoid potential hazards that may arise from inadequate structural support.I had built a loft which isn't full height above my two-car garage. Using incorrect beam spans can lead to serious consequences such as excessive deflection or even structural failure. By following these guidelines, builders can determine the correct size and placement of beams that can safely support the intended loads without sagging or compromising the overall stability of the structure. The primary purpose of using LVL beam span tables is to ensure the structural integrity of a building. joist spacing, first determine which size lumber will work. They take into account various factors like beam size, species of wood used, grade of lumber, and type of loading. Simply reference Span Tables for Joists and Rafters published by the American Wood Council (AWC). These tables provide information on maximum allowable spans based on different load conditions, such as floor loads or roof loads. LVL beam span tables serve as a guide for builders, architects, and engineers to determine the appropriate dimensions and spacing of LVL beams in a construction project.
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