I have 2x10s for a 13'6" span and I can feel a bit of a bounce sometimes. I'm not positive about your interpretation of the span charts, but I can speak from experience that 16' is to far for 2x10s. Regardless, i'm just to get confirmation that i'm reading these span charts correctly. Guess i didn't since they aren't treated. Gcrank1 My scenario above is for the main floor.not the loft.Īklogcabin I haven't look at i-joist. I may make a short one at one gable end just for some storage of seasonal stuff (which is always at a premium in a smallish cabin). If it is basically a sleeping area with no dancing or parties.storage of light stuff vs anvils?įwiw, We had a loft as part of the living space in our old one, not in the new one and Im glad, though we had ladder access not stairs. Solid floor good bouncy floor not as good.īouncy ime is relative depending upon the load and use. Havth you cecked out enginered joists such as TJI or BCI ? I did 16' TJI on 16" centers with a center support 3/4" TnG plywood on top and am very happy. I can tell you a 2X10 spannsuch 16' will be bouncy. Total length, span plus the supported ends. Would it also be correct when i say that my span is technically less than 16' because it would actually be the distance between the 2 beams? If i go to lumber ratings chart, it looks like a No.2 2x10 has a normal duration of 1210 and a modulus of 1,600,000. Now if i look at the span chart for those requirements, it looks like a 2X10 with a 1,500,000 modulus and a Fb of 1202 would work. If i look at the load requirements chart, it says floor joist need 40 live, 10 dead and a L/360 deflection. If I use treated lumber from my local Menards, their website specs it as southern yellow pine with a #2 or better grade. The joist will be running in the 16' direction and supported by 2 beams, each near the the end of the joist and rim board. Scenario: Elevated platform for a 1 story cabin with loft that will be 16' wide by 20 something long. So i think i have this span chart thing figured out, but i want to confirm. Small Cabin Forum / Cabin Construction / Help me understand span charts This type of joist is costly and installation tricky because they need to be custom-designed for each project.- Forums - Register/Sign Up - Reply - Search - Statistics. Builders favor them, especially for commercial projects, because they have natural openings that more easily accommodate pipes and wires without the need for measuring and cutting holes in the wood. Open-Web Floor Trusses: These joists are made of pieces of cantilevered wood.The advantage of an I-joist is that it offers long and continuous spans for residential flooring (and roofing). The top of an I-joist is made of wood or laminated veneer and the center support is typically plywood. I-Joists: More costly than solid lumber floor joists, this type of joist is strong, lightweight, and lasts longer than solid wood because it is made from different materials.Care needs to be taken because using younger trees for this joist system may result in warped boards. The chosen species affect the size of boards and results in limited span distances. Solid lumber floor joists: This is the most common and affordable type of joist made from mature trees.The Spruce Home Improvement Review Board.
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