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. Plus tips, advice, and special offers from Fine Woodworking. One where you can enter a value for the depth, length ,thickness and specie(solid oak,particle board, mdf etc.) This is why I-beams work so well, and why you can get a substantially stiffer shelf by using 1" thick shelves instead of 3/4".The other tricky part is the load and length of the shelf. 2x6s are … The single biggest difference between reality and the equations is the contribution of creep, or deformation over time. Todd. If you're storing books, the weight is proportional to the length, so going from 30" to 36" increases the weight by 20%. A Redwood 4x6 beam should span no more than 6' between supporting posts. Become an UNLIMITED member and get it all: searchable online archive of every issue, how-to videos, Complete Illustrated Guide to Woodworking digital series, print magazine, e-newsletter, and more. some of it gets pretty technical in nature, and mostly relates to pounds / square foot of loading. It may go even 20 feet , provided the beam has considerably higher depth to breadth ratio. 33 Related Question Answers Found How much weight can a 2x8 floor support? But there is nobody waiting with a hammer, if is varies. Thanks for contributing an answer to Home Improvement Stack Exchange! 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. Could you guys recommend a book or lecture notes that is easy to understand about time series? Check sag (deflection under load) and creep (permanent deformation under load) with the materials and design you plan to use. Asking for help, clarification, or responding to other answers. Fully loaded with hardcover books, there's little or no measurable deflection.The best edging is wide and attached on edge. 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. Sag is definitely less if the shelf ends are attached to the case, so if the shelf works ok supported by a couple of bricks or paint cans, it should work even better if it's attached to the case sides or back.Ken (I was a real engineer once upon a time) M, And I thought my 2000 plus books was bad, but then again I am a single guy in my thirtys so I have to buy them all myself (although of late finding anything to buy is harder then the buying is). 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. If the closet is shallower than 24" you can reduce it to the center of the closet as close as 10" as Testor101 suggests. A triple beam 2x6 on a scale of 10 feet should be more than enough for the normal loads of the deck. Too many of us have seen what happens to plywood, even 3/4-in thick, when it's not supported right during storage -- if it can creep under its own weight, it's definitely going to creep in use unless you design around this.Creep resistance for engineered materials (plywood, etc.) This is what I learned 40 years ago from my then 60 year old mentor. The 11 1/4" shelf will give the room needed to get the hanger on. 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. How far can a 4x6 span without support? People typically put the closet rods in the middle of the closet. Were any IBM mainframes ever run multiuser? I have seen brackets that are only have 1 1/2" to the center of the pole as opposed to the one in the illustration above that shows 2 5/8" more or less. 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. Some manufacturers make the seat that the pole sets in different heights. One question that many may wonder about when discussing countertop overhang support brackets is whether these are needed for quartz countertops. What is the standard distance a closet rod should be from the back wall? Is there also a minimum? I am NOT stating that this is the best way but worked for me.. My Son-In-Law is a Dr. of Education and he has more books than I could ever open much less read and understand and he had these expensive bookshelves that the SAGGED ALOT! Mentor added his name as the author and changed the series of authors into alphabetical order, effectively putting my name at the last. Alternatively, the use of 9-inch, 12-inch on-center spaced stretcher allows you to go up to 17 feet, 9 inches to L480. How far can a double 2x10 span without support? IF ya' drive drive a truck over it or you into that World Wide Wrestlin' thing... You can sink that hunk of 'steel' into the back of a 3/4 inch shelf with a groove and dado and never notice it. Or is it? Known for efficiency in his work, Mike Pekovich has built a few iterations of his sled for making mitered boxes. The maximum scale for a single yellow pin 2x6 2btr is about 9 feet. The 11 1/4" shelf will give the room needed to get the hanger on. For example, a double beam 28 can extend 8-ft. -0 inches when the bridge wheels are 6 feet long. The standard is 67" up to the top of a 1X4 ledger and 12" from drywall for single hanging. So you want to have room for them. (I now have a support on the bottom 2 shelfs). Our biweekly podcast allows editors, authors, and special guests to answer your woodworking questions and connect with the online woodworking community. A double beam 2x12 can extend over 12 feet to (2) 2x10 can extend over 10 feet and so on. Thanks again. A workable bookshelf design at 30" will probably perform like crud at 36" wide, and don't even think about 40" without additional support. I have found the Sagulator to be fairly good whenever I have used it. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers.