![]() ![]() Thomas, does what i came up with sound reasonable to you? I'm an environmental engineer, so i've taken some basic statics courses, but I'll defer to the more experienced structural people. 2 common, and it says a 2x8 joist, 16 OC, can go 12'9" for a floor that is 10 psf dead, 40 psf live load. I checked some span tables for douglas fir no. That gives me a lot more weight bearing, but i'm still not sure about the adequacy of a 2x8 carrying the load back to the beam. I'm assuming that can take a similar load? The rest of the floor would carry load to the side walls, which already supports the roof, and is a 2x4 wall over a concrete slab. If that means the beam can carry 540 PLFx 24' / (12'x24'), that gives me about 45 psf across the contributing area to the beam. The relationship between number of plys and PLF is linear, so for 4-ply, it would have 540 PLF. I found this pdf on coastal products page,, and I've got 4 ply, 16" beam. I'm assuming i'm reading the beam information wrong on the printout from the lumber store. ![]() Thomas, what you say about the PLF and contributing load area makes sense to me, but if 40 PLF is correct, it could barely hold up the 2x8s and plywood. Jim, I was looking at the coastal products page, but the 40 psi that it states in the footnotes doesn't quite make sense to me because you can't support an unlimited area. I'll defer to one of my illustrious Structural colleagues on how much more you can load it, if any, for your application. What this means is that with your wood, if you were to spread it evenly all over the floor, it is rated for you to put 24'x24'x10#/ft2= 5,760# on the level. If it was left there it would, over time, damage the shelf. For example, if you had a shelf that wouldn't sag with 10#/ft2 over time, you could put several times as much weight on the shelf and not have it break it would be "safe". If you build a shelf that is too wide for it's thickness and load, it may stand up OK initially but it will sag over time. Why the difference? The phenomena is akin to shelf sagging. The 40#/ft2 live load is for short-term loads. like wood storage, if it's going to be in place for any extended period. The 10#/ft2 dead load is anything that remains in place for a relatively long time. If this is so, and if the building was built to their guidelines, then the floor would provide a support for 10#/ft2 dead and 40#/ft2 live load. First, I'm going to assume that you are looking at this document: I'm an Electrical / Mechanical engineer, not a Structural, so hopefully one will jump in and correct me if I misspeak. So i'm safe putting all this wood up there? It just seems like a lot of weight compared to what we normally have on our floors. If the floor holds 40 psf, that's up to about 23,000 lbs spread evenly across the floor. (is that right?) for the wood, i've got up to 8000 lbs of wood. I've had it cut and stored outside a couple years, but the mice keep chewing through the tarps, and living in my wood pile, so i get sections of rot. I'd like to store some dried lumber up there. I'm unclear, but is 40 PLF the same as pounds per square foot? The product says 1-3/4 x 16 x 2.0E CP-Lam LVL 4 ply. The load say 10 PLF dead load, 40 PLF live load. I have the beam information, but i'm not completely sure how to interpret it. A beam was installed down the center of the garage between the garage doors only supported at the ends, and the second floors is 12 ft lengths of 2x8s installed over each garage stall, 16" on center, with advantech 3/4" subfloor over top. Ī few years ago, i had my attached 24x24' garage partly finished into a shop and a second floor installed. I'm cautious about how much wood i can store in my garage.
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