So the other guy saying a 2x6 is stronger than the 4x4 is right on: 2x6 on edge - 6" high --> 6" squared = 36. The wood is fir or yellow pine. I have 9' height on parts of my deck being supported by 6x6x16' posts buried 4' in the ground with proper footings. Not to be vague but a 4x4 has a lot of vertical support. This appears to be the point at which your beam will deform. For posts typically you'd want 6x6 for heights reaching 10'. Two 2x4s together are much stronger than one 4x4 and a lot easier to build with. The strength of a beam goes up with the square of the depth of the member. Re: 4x4 Pressure Treated Posts #698258 12/27/11 12:16 PM 12/27/11 … ! would I need to put on supporting cross members? - Answered by a verified Home Improvement Expert ... the post will be in the vertical position, used temporary to support a suspended slab. I built a playhouse for my kids using four 4x6 posts to support the house. I am building an observation deck in my back yard,and have poured 4 footings 5′ deep with 1′ being set concrete and 6’x6’x16’PT pine sitting on each poured footing x4plcs. Each post … How much weight will a 4x4 post carry? The same calculation can be used to figure the weight for pier (b), however instead of using 3 feet for the beam span you must use 6 feet to adjust for half the span in both directions. Assuming a 6ft length of 4x4 that actually measures 3.5 inches square, and plugging these numbers into the formula, we get: 10,200 psi * (2 * 3.5in * 3.5in^2) / (3 * 72in) = 4049.306 pounds. How much weight can a 10' doug fir 2 x 4 hold if the 2 x 4 is supported at the ends by joist hangers? I am going to be building a platform with the goal in mind to be able to hold up 2,500lbs. Therefore the length of the joist 12 divided by 2 =6 , multiplied by the length of the beam 6 = 36. So 2x4s should work great, thought I would reinforce them with another on the legs at least for strength. That means that a 2x8, laid on edge so it's 8" high, is four times as strong as a 2x4. Im now concerned about the weight of the house on the 4x6 posts. Continuous and Point Loads - Support loads, stress and deflections ; Board Feet Chart and Calculator - Board feet - volume measurement of lumber; total height is 9 feet but will be supported against side bending with a max of 5 … HI All,I have a question. My Question is how much weight will each post support? 900 pounds. In other words, the 2 x 4 is laying horizontal like a joist w/ the 4" side vertical. THANKS!! Anything going horizontal is a beam. The material you use to support vertically are your posts. I'd guess it would depend on how many you're going to use, how far apart they would be, and how much weight they support. 2x4 on edge - 4" high --> 4" squared = 16 (4x4 behaves as two 2x4 = 32. Multiply 36 by the total load 50 = 1800 pounds. 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