I saw the 6'10 and thought that was from pier to pier. are you saying two beams or three beams? I was thinking two, one down each side. That leaves no room for misinterpreting what is written. The length betw5my beams 6'10 inches will that sag with a 2x10 the outside board from the weight or should I use a 2x12 it will be a full loft upstairs.Ī drawing of the proposed plan would be very nice, showing distances between piers and beams. I understand about 16 on center and going closer but what about the length not width. It just takes all of the springiness out of the floor and feels way more solid, even if 16" centers were within spec. One thing I like to do when I build decks/floors is use 12" centers if i dont want sagging or i know that I am putting tile down. Although, check your terms and such, without blueprints or drawings we cant be sure that it works. If I am correct in seeing the span is 6'10" then you will be fine. If its pine from lowes it is most likely Southern Yellow Pine (syp) and most likely #2. If you are interested here's a link to some info on grades that I complied. The main thing to look for is the species and the grade. ![]() If you go to the store or lumber yard and look at the lumber you will see each piece is grade stamped. Then change the joist to a different size and recalculate. ![]() So, using Douglas Fir - Larch, 2x12, #2 on 16" centers the calculator indicates a maximum span of 18'1" with an end bearing of 0.64". The calculator provides the maximum span and indicates how much on the length at each end bearing point must be sitting on a solid support. Spacing is 16" normally could be 12" for a stiffer floor, or to reduce joist depth.Įxterior exposure: wet would be for something like a deck that gets rained on incised is sometimes used on treated lumber. Member type is Floor joistDeflection leave at L/360 for floor joists Select the species (if not sure, ask at the store) Quoting: pcroomI don't understand the calculator I don't understand the calculator I think it's pine from lowes and I don't need a permit for my size I'm building no codes needed. They do not meet codes for habitable bldgs and generally for good reasons. You have probably seen and read the many caveats against building on piers. For stone you need less deflection, L/720.Ģx12 on 16" centers work for most commonly available species and sizes. If you plan on heavy tile or stone increase the DL) Std floor deflection (sag) is L/360, where L= joist length in inches. ![]() Standard floor loads are based on 40 PSF LL=Live load DL = dead load, the materials. You need to know what lumber species are available to you and the grades. Handy calculator for sizing joists and rafters. Thanks please help I'm reading to start on the floor!!! I was going to use 2x12 for the floor joist is that overkill can I use 2x10 I don't want any sag in the floor. It's on peirs 9 of them them beams are 3 2x10 the space between them are 6' 10 inches the span between the beams. I'm building a 16x16 with a second floor but low enough that it's still under 300sq foot. Small Cabin Forum / Cabin Construction / Floor joist size to use? Forums - Register/Sign Up - Reply - Search - Statistics.
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