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how far can a shelf span without support

We have about 7000 books in the house, so I've built a few bookshelves, and I've seen what happens over time. For double hanging to keep clothing from dragging severely over the lower setting and on the floor, 42" and 84", I learned this from my own closet at home. I have found the Sagulator to be fairly good whenever I have used it. The thumb rule is 2X4 will extend 6, 2X6 8. Who is it? As others have stated, as slabs increase in span they generally need to get thicker in order to develop the lever-arm needed to resist increased bending moment (simply put). Obviously, the larger the beam, the greater the distance it can span between posts. Fully loaded with hardcover books, there's little or no measurable deflection.The best edging is wide and attached on edge. Gary Rogowski demonstrates his methods for this traditional yet strong breadboard end. If you're storing books, the weight is proportional to the length, so going from 30" to 36" increases the weight by 20%. Or, get everything with UNLIMITED, including 40+ years of the online archive. A local tech is on their way to help. Asking for help, clarification, or responding to other answers. Most center brackets are gauged to use a 1X on the wall to get the back of the bracket in the same plane as the ledger. Running your 2 shelf sizes, the larger shelf span (122 CM) won't hold more than about 2 KG overall without noticeably sagging. Does anyone know of a website to go to that has a nice load calculator? True, a prototype is not a bad thing, and I know a lot of peaple like the sagulator I just wanted peaple to be aware that sometimes it is not perfect. What would result from not adding fat to pastry dough, OOP implementation of Rock Paper Scissors game logic in Java, Decipher name of Reverend on Burial entry. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. 33 Related Question Answers Found How much weight can a 2x8 floor support? To determine whether you need center support or not, for me, is a rule of thumb that I picked up over time. rev 2020.11.24.38066, The best answers are voted up and rise to the top, Home Improvement Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. One question that many may wonder about when discussing countertop overhang support brackets is whether these are needed for quartz countertops. The widest hangers I know about are 18.5", so half of that is 9.25" plus 3/4" wiggle room. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In fact, for long term book storage, my opinion is that MDF and particleboard are essentially useless unless the shelf is supported on three edges. This is what I learned 40 years ago from my then 60 year old mentor. is going to depend strongly on the glue used to hold everything together.One of the reasons that I like wide edgings on plywood is that the edging is both stiffer than plywood (less deflection) as well as largely creep-resistant. Plywood tends to creep under load and shelves will develop a permanent "set" that persists even when the load is removed (hint: make plywood shelves removable so you can flip them if this happens). I said "self what do we do".. And I said to myself.. "I was a tank mechanic in the Army and we used METAL!". MDF is worse, and particleboard is even worse. Good air circulation is also important to minimize chances of mold and mildew. Thanks Todd, http://www.woodbin.com/calcs/sagulator.htm, Thank you. I've looked for them. With a dead load of 20 pounds, the maximum interval for a 2x4 is 5 feet. People typically put the closet rods in the middle of the closet. That puts the shelf at 67 3/4" to the top. Certain types of clothing tend to extend past the edge of the hanger. Thanks for contributing an answer to Home Improvement Stack Exchange! First off it does not seam to take into acount if you put a front or back edge on the shelf (at least the version I did) and frankly I am not sure it does a great job. Any span that is over 4' for wood poles, it can be longer if you know it will not be loaded fully, 5' for metal, with the same exception as wood. Build 20x20 Deck • How far can a 2x6 span without support? As you can see, 10 MM plywood isn't that stiff for shelf use. If you look at the moment of inertia equations, it's clear why: resistance to deflection is proportional to the cube of the distance from the center of the cross-section. This is what I learned 40 years ago from my then 60 year old mentor. of a shelf and the calculator would tell what the sag would be initially then over time? How to get proper support for a closet system from a firewall? "Even if you understand everything I just wrote, you can still get into trouble. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. The 11 1/4" shelf will give the room needed to get the hanger on. Alternatively, the use of 9-inch, 12-inch on-center spaced stretcher allows you to go up to 17 feet, 9 inches to L480. That said, there is nothing like building a prototype of the shelf and actually testing it. What if the P-Value is less than 0.05, but the test statistic is also less than the critical value? 10 inches (254 mm) to the center of the rod, minimum. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Closet door doesn't close completely from the top side - IKEA closet and hinges. A workable bookshelf design at 30" will probably perform like crud at 36" wide, and don't even think about 40" without additional support. You can add a wood support under the shelf. For details on how we use cookies, collect data, & how to manage your consent please see our Cookie Policy & Privacy Policy. So you want to have room for them. How to place 7 subfigures properly aligned? Mentor added his name as the author and changed the series of authors into alphabetical order, effectively putting my name at the last. A Redwood 4x6 beam should span no more than 6' between supporting posts. Realistically, could you build a useful built in closet in a space that is 77.5in x 9.4in? the centerline of the closet pole cup is typically is 2" from the top of the ledger, it can be lower, then the ledger needs to be wider to accommodate. We would then measure the sag. The sag calculation isn't that complex. A triple beam 2x6 on a scale of 10 feet should be more than enough for the normal loads of the deck. How to calculate angles for Hexagonal roof parts, Complete Illustrated Guide to Woodworking USB, From the Editor: Publishing during a pandemic, Save 56% off the magazine newsstand price. There is a new post in here about using metal in your woodworking projects. The shorter shelf (61 CM) can hold about 10 KG overall. I ran the numbers on a shelf I built (to fit existing cases I was given) and with out a thick front and back (the shelfs I built have said fronts and backs) for the depth of the shelf using the numbers they give for books, the shelfs should work, so with the front and the backs added (and a pin in the center of the rear) I figured I was pretty good, but they sagged something nasty. Is there a standard distance that a closet rod should be from the back wall of the closet? It may go even 20 feet , provided the beam has considerably higher depth to breadth ratio. Mike Pekovich has a sled for each job: a sled for cutting dovetails, one with a sliding fence for box joints, a sled with a lower fence and stops for cutting dadoes, one with a tall fence for cutting tenons, and a dedicated sled for mitered boxes. As far as I know, there is no "standard" for this. Shelving Spans for Bookcases: If you're designing a cabinet or a bookcase, what's the greatest length (span) a shelf can be without an objectionable sag?

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