![]() ![]() The ones quoted are very likely not the same strength, but keep in mind if you want thinner boards you will want the wider boards and so on. I have built a a bed frame before out of construction lumber, there 2 inch thick planks held well, but do not know the nature of some standard furniture hardwoods like oak or ash.in terms of structure you can go with a wider board (1/2 x 12) or narrower board (4x4) and there will be some certain sizes that work together with same strength. I get it, the thicker, in most cases - the better, but I am looking to balance out the budget. I am planning to use bed rail fasteners ( ). Would 3/4 be enough? Or 4/4 or higher should be used instead? I was wondering, what is a safe wood thickness that can be used in the bed frame/rails? I am looking to build a King Size bed out of Red Oak or Ash. I have been working with wood on DIY/hobby level for last 5 years. I know there are couple of good lumber places near Ottawa, but that would be too far for me to drive. Getting 1 1/4 X 7 1/4 x 8 would cost almost 30% more. I was thinking of getting something like 3/4 X 9 1/4 X 8 feet for bed rails (and for footboard). I do not have thickness planer, so getting undressed lumber is probably out of question for me. ![]() I found a bunch of lumber places in driving distance that have dressed lumber but only 3/4. There is royal wood shop near me (Aurora), it is a great place, but a bit pricy for me ( ). The problem for me is that, I cannot really find a lumber place (I am at Newmarket, in GTA) that I can get quality vs price. Poplar is used by the author, but personally I like poplar for light stuff, not for weight bearing things, so I want to use Oak instead. I am looking at building something like this design: That was thorough analysis, and it does make sense, the vertical load requires more width of the board, not thickness, which is a new lesson for me. ![]() Thank you everyone for all the replies, especially Troglodyte. To achieve similar numbers with Red Oak would yield a board either: It's load for a 0.25" deflection would be 395 lbs That boards maximum load would be 3,225 lbs I'd base your minimum size on a typical ikea bed, mine is 7/8" x 6" (same as NugsTheCat above), made from pine. Note that the length and thickness are both linear factors, while width is an exponential factor, meaning that a change in width has more impact that a comparable change in thicknessįor instance a red oak 2" x 2", with 7 foot span, has a maximum load of 1276 lbs, whereas a 0.5" x 8" board (oriented vertically) has a maximum load of 5,104 lbs, despite both having the same cross sectional area. Load Resistance - species dependent strength constant In terms of calculating maximum load before failure, there are four parameters This site ( ) provides the formulas for Modulus of Rupture and Modulus of Elasticity. Your question sent me to down a rabbit hole of curiosity. ![]()
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