![]() 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. They calculate LVL sizes all day.Hey all. That said, this situation sounds like something an engineer could knock out pretty quickly…especially those who work mainly in the residential sector. engineer will want do all calculations himself/herself. ![]() On the other hand… interesting to work out how to do it and see if the structural engineer comes up with the same answer! I doubt a structural engineer will just write “See Rhino, GH, Karamba model that the customer has supplied himself” and give you a big discount for saving time! It was frustrating because it looked like something I could have worked out myself but it was the calculations that bulding control want to see. I’m not 100% sure of this but I think you won’t save any money by doing this because for building regs you need to show the calculations for the beam done by a qualified structural engineer so even if you took a GH load analysis to a structural engineer they are unlikely to then give you a discount on the calculations that they would still have to do.įor every steel used in our house we got the spec sent back from the structural engineer straight away and when we paid the invoice we got the calculations.
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