![]() ![]() The PDF I linked in this post for pham shows individual 1-3/4" only which is why I was originally doing the math and dividing by plys at an earlier time. What do you mean by loads are probably wrong unless it's really low attic space? Please share! Are you talking the 10PSF live load factor? I'm here to learn and make sure I - That was my mistake in typing late and mixing the PDF's. I am a little more familiar with this companies' tech sheet. I traditionally follow the LVL manufacturer specs for fastening them - I meant to link this ONE. RE: PLF Calcs for LVL Beam Luceid (Structural) 28 Apr 23 - Building LVL beam consisting of multiple 1-3/4" LVL sorry if plys was confusing there. I was considering using the percentage change from their roof PLF (240) to their floor PLF (360) and multiplying that ratio to the numbers but I'm sure that's just shooting in the dark. It seems too easy simple, and I'd also like to know of any quick formula perhaps to convert the PLF rating of the LVL for less deflection like L480 when their chart maxes on 360. and the first LVL to do 280 with 3 ply 14".Ĭan someone please tell me if this is the correct process, assuming I had a correct PSF to start with? I'm just looking for confirmation that I am not missing something here. When I comb through the chart, I locate 22' for the span and go across on the "Two 1-3/4" GP Lam LVL" (and three) to find the first LVL that can do 280 with 2 ply is a 16" LVL. I scroll down to the Allowable Uniform Floor Loads because it uses at least L/360 in this case since it is drywall that would be sagging here. In this case, the Georgia Pacific GP Lam LVL tech sheet has 1, 2, 3, and 4 plys already built in. I then divide this by 2 and 3 to find my individual PLF capacity needed for 2 and 3 ply of LVL EDIT:If using a chart for single 1-3/4" only. I'd say that is more than 10PSF but online searches seem to treat person in attic as 10PSF?įor the first part of this, I am taking 20PSF x 14' (half the 28') to get my PLF of 280. 5PSF for attic dead load of insulation and 2圆 framing (stick framed with rafters, ridge board, etc and not webbed truss), 5PSF for two layers of drywall/mud, and 10PSF for what would be live load of someone crawling around in attic. I was going to use 20PSF for this rating. The ceiling joists have 5/8" drywall - let's say 2 layers - and then attic space above with blow in insulation. The ceiling joists are for two rooms, each room for this example has a length of 14' so the "Span Carried" would be 28' but technically when I run the PSF I would halve this I assume? A LVL beam to be installed to support ceiling joists that are *not* continuous, as in they tie into the LVL beam. I believe this is the PLF rating? It seems a little too straightforward using the tech sheet so I want to make sure I am calculating correctly. I'm wanting to learn how to properly size an LVL beam when the specifics do not simply fall under the manufacture's generic span chart giving two options for premade spans. Suppose you have a uniform load of 1000 pounds per foot (plf), you're using SPF LVL, and you want to span 12 feet.Hey all. They can provide professional guidance and ensure the structural elements meet safety standards. If your project is complex or if you have any doubts about the calculations, it's advisable to consult with a structural engineer or architect.Codes may impose additional requirements or restrictions. Ensure that the calculated LVL size and span length comply with local building codes and regulations.The calculator will provide recommendations on the suitable LVL size and maximum allowable span for your specified conditions.Enter the gathered information into the span table calculator, such as load, species, size, and span length.You can access these tables in product literature, engineering manuals, or on the manufacturer's website.These tables offer recommendations based on load, species, size, and other factors. Manufacturers of LVL products typically provide span tables specific to their products.Span Length: Measure the distance over which the LVL beam or joist will span (e.g., in feet).LVL Size: Choose the initial LVL size options available (e.g., 2圆, 2x8, 2x10).LVL Species: Select the appropriate LVL species (e.g., SPF, Douglas Fir) based on local availability and requirements.Uniform Load: Determine the expected load per linear foot (e.g., in pounds per foot, plf) that the LVL beam or joist will support.Maximum Safe Span: feet How to Use an LVL Span Table Calculator: Enter the required information below to estimate the maximum safe span for LVL beams: Select Beam Size: ![]()
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