Building Materials. How much weight does a 6x6 post support vertically? Discussion Starter • #1 • May 18, 2016. 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 This appears to be the point at which your beam will deform. If there is no strong wind, a 2x4 measuring at least 8 feet can support at least 1,000 pounds vertically. Sort By Featured. This table provides the weight per linear foot of the different sizes (or dimensions) of pressure-treated lumber, both freshly treated and after drying. 4 Answers. I am building a stand to hold my refugium and I am wondering how much weight a 4x4 can hold if the only support is two legs on either end of the 4x4? How much weight can a 2x6 hold on edge based on load type? Premium Member : Join Date: Jun 2004. See Store Availability. Click here for our new Roofing Forum! weight allows for easier handling of assembled components. I live in CT. An ~8ft long beam sits horizontally. The weight of pressure-treated lumber varies depending on the size of the boards. People, who want to know how much weight can a 4×4 beam support, be it on the backyard swing set or the deck with a hot tub in it, worry not because we have got the answers for you. A 4x4 column is a lot stronger than a 4x4 beam. Sort by . I'm obviously a layman. Around 85% of the pressure-treated wood in the US is made from southern yellow pine. How much weight will a 4x4x8 hold horizontally? It’s possible that it could hold much more weight than 50 lbs. Out of Stock Online . Find the answers to your questions about roofs and roofing. A kiln dried 2x4x8 weighs in on the lighter end at around 9 lbs while the pressure treated 2×4 weighs in closer to the 17 lb range. All of the 4x4 are pressure treated, don't know if that makes a difference. How much weight can a vertical 4x4 post hold? A 4x4 column is a lot stronger than a 4x4 beam. 4-in x 4-in x 10-ft #2 Pressure Treated Lumber. Weights of Various Woods Grown in the United States. the length of the 4x4 is 82". 1) Some species of wood are stronger than others, (i.e. 100 POUNDS PER Square foot up to 50 square feet if properly. Ken l. And, pardon the pun, but boards are only the surface of … 1 decade ago. Get your answers by asking now. We get 10,200 psi. * The approximate weights of the actual pieces of pressure-treated lumber for sale are usually given in the product descriptions, so this can be a good resource for calculating these weights. My boat is about 2600 lbs, and wondering if 4x4x8' can take the strain. Step 12 With your pencil, mark where the 2x6 lays against the outside of the 4x4s on each side. How much load can a board support, if it is supported only at the ends? See pressure-treated lumber at the Home Depot. Location: Huntsville, AL. Do not pick the cheapest. Hold your level at that line and draw it across both the 4x4 legs. So, perhaps 6000-7000 pounds total. To hold lots of weight as a beam, you would need a piece of wood that is about three or four times the vertical dimension as the horizontal, in cross section. Standing under the swingset, have your helper hold one of the short 2x6 pieces horizontally against the upper part of one side, flat against the two 4x4s, with the narrow top of the 2x6 pressing against the bottom of the crosspiece. They are spaced about 6 FT apart. I have 4x4 pressure treated and lathe cuts in them to round them off at certain heights to make them look fancy, Smallest dia must be 3" where lathe cuts grove out. Pressure Treated Lumber (58 products) Category. Step 1 Calculate the weight the beam must support. Next do the same thing with another 2 posts. (For example, a 2x6, or a 2x8). 3) Wood, pressure treated, can loose 20% of its strength and if it’s installed outside in a rainy or high humidity climate, can … 4-in x 4-in | Pressure Treated Lumber . The roof is 24 FT LG 2x6 with 1/2" ply sheating with torch down. Other treatment designations relating to end-use applications include "Above Ground", "Foundation", and "Marine". Thank you. I would be better if you put a rope over the beam and suspended the bag from it Drill your holes through the center of the beam if you must have holes. As the wood returns to its normal air dried weight over the following weeks or months, it also returns (almost) to its pre-treated weight. So I started building a pergola and then wondered if the 4x4 post can hold the load!! 6X6 wood post ( twist induced by wind for example, a 2x6, or knows where I might the... 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