How much weight can a 8x8 post support vertically

So I am now building it with 33mmOD 3.2mm wall pipe. This does have a small amount of flex, but I am confident with climbing that it won't get bent out of shape. By the numbers, for the 3m span using the common 35 ksi (240 MPa) yield strength, that pipe could develop a permanent bend with as little as 148 lbs (67 kg).

For a 14-foot span, you’ll use beams that are 2”x6”. Building a pergola with a 20-foot span will require 2”x12” beams. As you can see, the beam sizes go up the wider the pergola is going to be. So choose the right beam size based on your desired pergola dimensions. The posts are usually going to be 6”x6”, but they can be different ...When that post is stood on end, the weight is supported along the length of the long grain, where it can support that load. On one hand, posts and columns are the same thing, vertical structural elements, which are used to support weight.For hemlock/fir beams, this document from the school of architecture at the University of Maryland states that in compressive loads, parallel to the grain, a 6x6 post 10 feet in length, can support 4400 lbs. Shorter lengths can support more weight. At 6 feet, it's 10,000lbs. Douglas fir can support more than hemlock. But the more critical issue as others have pointed out, is the span.Item # 1630377 |. Model # Y280820-GC. 1. Get Pricing & Availability. Use Current Location. Southern yellow pine. Treated to Copper Azole. Ground contact and freshwater acceptable. Common Length Measurement: 20-ft.How much weight can a 6x6 post support vertically 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. The outside diameter will generally be ½” – 1” larger than the tube size, but can be as much as 2 ...The material used in the construction of a concrete block affects its load bearing capacity. For instance, a 10-by-8-by-16-inch concrete block made with stone dust may support more weight than a 15-by-12-by-24-inch block made with sand, because stone dust exhibits greater weight and strength than sand. Also, some concrete blocks exhibit holes ...

Here you can operate by assumptions that there is no wind or it is not as strong. If there is no strong wind, a 2x4 measuring at least 8 feet can support at least 1,000 pounds vertically. Such calculations would hold if, for instance, the load is square. However, it is highly advisable not to push the 2x4 material up to its limit.But the weight that people really notice when it comes to treated lumber is the water weight that the wood picks up while being treated. A 6×6×10-foot long treated post weighs about 153 pounds immediately after being pressure-treated, but it will only weigh around 87 pounds after it has had time to dry out.The larger size of 8×8 posts means that they are able to support more weight than 6×6 posts. This makes 8×8 posts ideal for larger construction projects or structures that require extra support. For example, an 8×8 post can typically support up to 10,000 pounds, whereas a 6×6 post can only support up to 6,000 pounds. Price ComparisonWhat I figured if the weight is distributed evenly is that each 4x4 post is supporting a max of about 420 pounds. Thats about 3 of me and I cant imagine that …Sep 30, 2013. Steel Weight. In summary, the stand will be able to support a tank that weighs 1600kg or more. The stand is made out of 2mm thick steel square tubing, and will be able to support the weight with the help of 4 legs and 2 beams. The stand is able to withstand compression and tension, and will not collapse under the weight of the tank. 2. Height-Dependent Weight Support. Like 4×4 posts, the height of a 6×6 post significantly influences its weight support capacity. At a height of 3 feet, a 6×6 post can manage a remarkable 20,000 pounds. This weight limit decreases as the post height increases, with a 14-foot post supporting about 10,000 pounds. 3. Optimal Weight Management How much weight will sustain a 4 rubber 4 post. With the post in the vertical position total height of 9 feet it is estimated to around 5000 lbs with a perfect weight repartitions on both 44 ends. Click to see full answer. However an 8-foot 44 supports 6468-pounds and 2339-pounds at 14-feet while a 66 is 18032 and 10550-pounds respectively …In general, the maximum span for a 4-by-6 beam is 6 feet between 4-by-4 posts. If you move up to 4-by-8, you're usually allowed to span up to 10 feet between posts. A 4-by-10 can usually span up to 12 feet between posts. Keep in mind that these figures depend on the size and spacing of joists and the overall structural loads.

In practice, a 6x6 post 9ft long will probably be OK to support a light load such as a porch roof, though unduly heavy snow loads and other factors may need to be checked. Like. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.Note: The 8x8 Support Portal (My 8x8) is accessible to users with admin rights, on 8x8 business accounts, using their 8x8 username and password or to all users via support.8x8.com (selecting Get Support in the top right).On the other hand, a jack post installation typically costs between $10,000 and $15,000. This price includes labor, jack post costs, and mobilization fees. How Much Weight Can a Lally Column Support? The load-bearing capacity of the lally column depends on its dimensions. A short lally column can support more load than a long …how much weight can a walking bridge support with 3 glued and screwed 2"X10" X 20 feet long set at 30" apart The bridge would be 42" wide with 2" planking … read more StructuralEng

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After the slab is cured hammer drill for 7/8" rawl bolts. Laser cut (or use you tablesaw) lexan or acrylic sheet 1/2" thick, with the hole for the bolt. Screw on a Timberlinx connector to the rawl bolt. Drill 2 1 1/8" holes in your posts, slip in the wedge anchor and pull the posts solidly don to the concrete with the plastic plate (for a ...So, a 6×6 is significantly stronger than a 4×4 in comparable situations. Optimally, a 6×6 DF (interior north) spanning 8 feet will support a center load of almost 4740 pounds and about 1180 pounds per foot if the load is uniform. Using DF-SS as a 2-foot post it has an axial compression load capacity of 34,461 pounds, at 4 feet, the load ...We would like to show you a description here but the site won't allow us.Post Hole Digging Tips. Use pressure treated lumber for posts since they will be in contact with the ground; An 8″ auger will cut about a 9″ diameter hole which is plenty wide for a 4×4 post; A 3″ base of gravel underneath each post allows for water to drain away from the base of the post, preventing wood rot

The 2x4 wall can handle around 1000 pounds vertically. But you put the limit to the test meaning you are probably breaking the wall before reaching 1000 pounds. Use a joint or two, a stud wall helps, or doubling the layer could help, anything to reinforce the wall if the main concerns are the wall breaking out because abused by children. If you're referring to a split - log checking crack - in a vertical post, there's no repair needed unless the split has compromised a structural connection. Checking cracks in a post ( a vertical "beam") are not normally a worry at all as long as they don't run across a structural connector such as a bolt or peg. On 2022-10-14 by Mike C Safe loads for wood columns. Safe loads for Wood Columns - No.1 grade Douglas fir-larch: a kip is a non-SI unit of force - it equals 1,000 pounds-force. 1 kip = 4448 Newtons (N) = 4.45 kilo Newtons (kN) = 453 kgf.May 22, 2013 · In practice, a 6x6 post 9ft long will probably be OK to support a light load such as a porch roof, though unduly heavy snow loads and other factors may need to be checked. Like. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread. A single 8-foot 2×8 as a post will vertically support between 897 and 1,315 pounds before buckling, depending on wood species, grade, and other factors. A 2×8 on edge as a …So, a 6×6 is significantly stronger than a 4×4 in comparable situations. Optimally, a 6×6 DF (interior north) spanning 8 feet will support a center load of almost 4740 pounds and about 1180 pounds per foot if the load is uniform. Using DF-SS as a 2-foot post it has an axial compression load capacity of 34,461 pounds, at 4 feet, the load ...jratftcc Discussion starter. 37 posts · Joined 2013. #1 · Apr 6, 2013. Anyone know the following: Weight bearing load of a vertical 4x4 piece of wood, compared to a 6x6. And weight bearing load capability of horizontal 4x4x8, at its center. meaning if I hang something from the middle of that elongated 4x4x8 what is the maximum weight it could ...Sleeve gastrectomy can provide long-term weight loss. The amount of weight you lose depends on your change in lifestyle habits. It is possible to lose approximately 60%, or even more, of your excess weight within two years. In addition to weight loss, sleeve gastrectomy may improve or resolve conditions related to being overweight, including:We’ve probably all seen the vertical lines that appear on the walls of some structures and wondered what it is. We’ve also seen traditional horizontal Expert Advice On Improving Yo...Repeat until desired number of Stamps have been added. Enter lumber size, type of use, and span requirements in the Design Criteria section. Calculator generates the maximum span distance as well as the bending strength (F b ), shear strength (F v) and bearing strength (F cp) values for each Stamp selected. Note: The design values shown in the ...

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The boards overhang some but can still support the load near the ends. For say a 3 foot wide tread let them overhang the beams by 3.5 inches on each end. If you have 4x4 posts bolted to the side of the beam that extend up for a safety/hand rail just notch the boards around the posts.Oct 13, 2015 · How can I calculate the maximum load a rectangular horizontal wooden beam of dimensions L x H x W can safely support if the beam is adequately supported at both ends? assuming worst case - load concentrated at center; for commonly available types of wood (e.g. Spruce) How to Calculate the Weight of an H Beam. You'll first need to calculate the volume of the H beam, and you can do so via the following equation: V1 = (W x FT x L) x 2. V2 = (H - (2 x FT)) x WT x L. V3 = ( (R x 2) 2 - (π x R 2 )) x L. Overall Volume = V1 + V2 + V3. The above H beam weight formula consists of the following elements:The weight of treated wood can vary depending on factors such as the wood species, treatment level, and moisture content. On average, pressure-treated wood, commonly used for outdoor projects, can weigh around 38 to 42 pounds per cubic foot for pine, 28 to 32 pounds per cubic foot for cedar, 34 to 38 pounds per cubic foot for fir, 38 to 42 pounds per cubic foot for hemlock, and 32 to 36 pounds ...I put up a shed supported by 4x4 posts and noticed a good amount of vertical cracking in the supports. At first this scared me as I thought maybe I had too much weight and these were stress cracks. But then I got to looking at some various decks, fences even went to the lumber yard and noticed the same type cracks in all the dried 4x4s I found.The metal weight calculator allows you to calculate the weight for stainless, aluminum, steel and more! Use the calculator to determine how much metal you need for your project.SKU: 80110088. 8" x 8' Wood Round Post - 8TBDLP-8. $4499. Quantity. Free. In-Store Pickup. Please select a store to view availability. Select Store. Add to Cart.Weight: 123.4 kg: Dimensions: 16 × 8 × 8 in: Available Finishes: Bandsaw Finish. Related products. Wood Grade: Appearance. 8″ x 8″ – 16′ Yellow Cedar Weight: 123.8 kg. 8" x 8" posts make a statement, heavy duty and chunky looking. Suitable for a garden pergola, arbour, or gate posts. This product is green (wet) and is best suited for ...8x8 Meet for Salesforce Integration. 8x8 Meet for Salesforce Integration Quick User Setup. 8x8 Meet Link Opens in the Browser Instead of 8x8 Work Desktop. 8x8 Work Meetings does not register Microphone and or Video hardware. Adding an 8x8 Video Meeting to an Existing Google Calendar Event. Adding an 8x8 Video Meeting When …

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Look for a Visible Foundation. Inspect the area around the bottom of each porch column for any visible foundation or base. Load-bearing columns require a stable foundation to support the weight they carry. Look for mounting plates securely screwed into the porch flooring or concrete blocks (also known as concrete piers) supporting the base of ...Parallam® PSL Columns. Parallam® PSL columns are strong and consistent. Our manufacturing process uses veneer strands, allowing a significant percentage of each log to become a high-grade structural member. Combine their great load capacity with the strength of Parallam PSL beams for additional possibilities.If there is no strong wind, a 2x4 measuring at least 8 feet can support at least 1,000 pounds vertically. How much weight can a 2x4 stud support? Depending on the length of wall, a 2x4 wall could support 20,000–30,000 lbs .On the other hand, a jack post installation typically costs between $10,000 and $15,000. This price includes labor, jack post costs, and mobilization fees. How Much Weight Can a Lally Column Support? The load-bearing capacity of the lally column depends on its dimensions. A short lally column can support more load than a long column.SKU: 80110088. 8" x 8' Wood Round Post - 8TBDLP-8. $4499. Quantity. Free. In-Store Pickup. Please select a store to view availability. Select Store. Add to Cart.According to Fortress Building Products, most decks that are built with traditional pressure-treated wood frames (or southern yellow pine) and decking boards can hold up to 50 pounds per square foot (PSF). So then, if your deck has 100 square feet, it'll support up to 5000 pounds. However, this method only works with a traditional wood deck.Add a comment. The tubing that you suggested 1800mm x 25mm x 25mm with wall thickness of 3mm can be converted to an approximate dimension of 72" long, 1"x1" square outside size and a wall thickness of 0.118". The suggests that such tubing supported at the very ends would experience a deflection of almost a half an inch with a 100 pound load ...Hollow block is a highway for termites. 2009 IRC R606.6 Piers. The unsupported height of masonry piers shall. not exceed ten times their least dimension. When structural. clay tile or hollow concrete masonry units are used for isolated. piers to support beams and girders, the cellular spaces shall be.Typically, a deck can hold a minimum of 50 pounds per square foot. However, that number assumes your deck is to code without the deck's weight taken into account. Overall, there are several factors to consider when thinking about how much weight a deck holds. That's not all that you have to consider when adding a new edition to your deck.Seems to me you're trying to talk yourself into a full span of twenty feet or more. An 8x8 (even with no load) would sag under its own weight at that distance. Stop agonizing over it and add a mid-span post. Any professional carpenter will tell you the same thing. From contributor A: A 6 x 8 will span 12' for flooring.How much weight can I hold on 2×10 floor joists? 1 Response Yes, two 13′-6″ 2x10s will support 2,200 pounds. The grade of lumber used can range from No. to No. Is 3/4 plywood capable of holding a lot of weight? 50 lbs 50 lbs. How much weight can an 8×8 carry? An 8×8 post can hold 64,000 pounds if a specific species of wood can support ... ….

The lumber weight calculator below will estimate the weight, specific gravity, and density of any species of wood. To calculate other wood weights and volumes, check out: The log …Pressure-treated exterior wood provides long-lasting support and defense for all-purpose applications. Fitting for burial or contact with the ground and freshwater immersion applications. Piles of 8x8 12-ft Treated Yellow Pine S4S ( Pressure Treated Post s) ready for delivery. Home Improvement Outlet is stocking a LARGE selection of top-quality ... In rough terms: a lot. But much depends on what type of wood, what condition it’s in, how the ends are attached (this matters a lot) and how much deflection is allowed. If you don’t care about deflection at all, the ultimate load of a 2x6 is probably a lot higher than you think it is. 400 lb or more. generally yes, but getting two pieces of ... how much weight can a 8x8 post holdThis is the weight per foot of a 2×8 made from Engelmann spruce. Step 6: Multiply by the length of the 2×8. If your 2×8 is 12 feet long, multiply 12 by 1.736983 to get 20.843796 pounds. We’d round this to 20.84 pounds to be practical. And there you go, a 12-foot Engelmann spruce 2×8 weighs 20.84 pounds.Sep 17, 2023 · The weight capacity of a 4×6 post depends on various factors such as the type of wood, the length of the post, and the distance between the posts. Generally, a 4×6 post made of Douglas fir can support up to 4400 pounds vertically. However, this weight capacity may reduce when the post is in contact with the ground, exposed to moisture, or has ... For a larger deck using 2×4 joists, you need added support. A support beam, post, pad or post buried in the ground at each end and at the mid-span would better support the joists. ... The amount of weight a 2×4 joist can support would depend on multiple factors, like the spacing and shape of your deck, the wood grade and form, the load ...For use with ground contact. Limited lifetime warranty. 8 in. x 8 in. x 12 ft. Can be painted or stained. No two pieces of lumber are the same. Color, grain pattern and texture will vary as well. Use #2 grade lumber when both appearance is not the most important to you project. May have wane (bark edge) on corners.A 8x8 beam can span a maximum distance of 32 feet without support in the middle. This is because the beam's strength is inversely proportional to the square of its length. In other words, the beam is four times as strong when it is half as long. Therefore, a beam that is 8 feet long can support twice the weight of a beam that is 16 feet long. How much weight can a 8x8 post support vertically, When it comes to shipping and mailing services, Canada Post is a trusted name for Canadians. However, there may be times when you need assistance with your packages or have questio..., How much weight can a 4×4 wood post support vertically? The load capacity of a 3-foot #2 grade 4×4 is 17,426 pounds, and a similar 6×6 is 20,834 pounds or 16% better. However, an 8-foot 4×4 supports 6468-pounds and 2339-pounds at 14-feet, while a 6×6 is 18032 and 10550-pounds respectively – or 64% and 78% more load capacity., Apr 26, 2019 · Codes have long required that all plies of a built up beam must bear on the post, so naturally a 4x4 (at only 3 1/2-in. wide) can only carry a three inch wide two-ply beam. Thus, the area of deck that can be supported by a 4x4 post is limited to two-ply beam spans. The 2018 height reduction recognizes proprietary post-to-beam connection ... , Higher values are safer. If the material can take 50,000 PSI of stress and the load puts 25,000 PSI of stress on the material, the safety factor is 2 (the material is 2 times as strong as the stress from the load). ... the weight of your vehicle will not be a static load on just one tube. Your vehicle will be moving, with many tubes in the roll ..., If you're referring to a split - log checking crack - in a vertical post, there's no repair needed unless the split has compromised a structural connection. Checking cracks in a post ( a vertical "beam") are not normally a worry at all as long as they don't run across a structural connector such as a bolt or peg. On 2022-10-14 by Mike C, Generally, however, plywood can support a significant amount of weight. For example, a standard 4×8 plywood sheet with a thickness of 3/4 inch can support over 2,000 pounds when properly installed with sufficient framing and support., Conclusion. For many reasons, 6×6 posts are a clear choice, with few benefits to 4×4 posts. Advantages involve the fact that: 6×6 posts can carry loads up to 78% more than 4×4 posts at 14 feet. 6×6 posts are much easier to apply to notch. 6×6 posts are more durable against weather conditions., A good indicator of a wood's strength is its density — the weight for a given volume. This is measured by its specific gravity — the weight of a volume of wood divided by the weight of the same volume of water. Generally, the higher the ratio, the denser and stronger the wood. This is not always the case, but specific gravity is a useful ..., Sep 30, 2013. Steel Weight. In summary, the stand will be able to support a tank that weighs 1600kg or more. The stand is made out of 2mm thick steel square tubing, and will be able to support the weight with the help of 4 legs and 2 beams. The stand is able to withstand compression and tension, and will not collapse under the weight of the tank., A fence with 4×4 fence posts standing vertically and properly anchored in the ground can hold a weight-bearing load of approximately 10,000 pounds. Likewise, a 6×6 fence post can hold about 24,000 pounds. Steel posts can withstand 360,000 pounds of force; with vinyl withstanding 165,000 pounds. Each kind of fence post has its own purpose, and ..., Visit https://brilliant.org/TheEngineeringHub/ to get started learning STEM for free, and the first 200 people will get 20% off their annual premium subscri..., According to Chicago's exceedingly stringent Deck Code (pages shown are labeled 34 and 35) you can do either a half lap or a butt joint. Both require hot dipped galvanized (min. 1/2" or 5/8", depending on splice type) through bolts, washers and that they be 6x6's in the first place.. Having to transfer this to a 4x4, I'd pay special attention to the minimum edge distance of 1.5" and probably ..., Step 5 - Trim Planted Posts. When the post concrete has hardened (usually 48 hours) use your measuring tape and measure 77 inches up from each post base. Place a mark here. Cut off the excess post length wherever it exceeds the 77 inches. Properly set posts are the most important structural element of a carport, so plan ahead to get it right ..., A 4×4 roof post can support up to 4000 pounds when lying horizontally, while you use 4,300 pounds or even more when it's vertical. The 4×4 post can't withstand the enormous weight of the deck, causing the entire porch roof post to collapse. Hence, you can't use a 4×4 post to construct a deck. Jonathan., Decks, Patios, Porches, Walkways, Driveways, Stairs, Steps and Docks - Concrete Pier Load Capacity/Calculations - Can anyone recommend a way to calculate load bearing capacity of a concrete pier/post. Say 12 diameter sonotubes sunk 2 feet in the ground and 1 foot above the ground to support a wooden deck. How much, Sleeve gastrectomy can provide long-term weight loss. The amount of weight you lose depends on your change in lifestyle habits. It is possible to lose approximately 60%, or even more, of your excess weight within two years. In addition to weight loss, sleeve gastrectomy may improve or resolve conditions related to being overweight, including:, Be conservative and estimate the soil can only support 2,000 pounds per square foot. For sake of discussion, imagine the total weight of your deck loaded with people and furniture might be 12,000 pounds. At the very minimum, assuming the load is equally shared by all the support posts, you’d need six deck pier blocks., The weight of treated wood can vary depending on factors such as the wood species, treatment level, and moisture content. On average, pressure-treated wood, commonly used for outdoor projects, can weigh around 38 to 42 pounds per cubic foot for pine, 28 to 32 pounds per cubic foot for cedar, 34 to 38 pounds per cubic foot for fir, 38 to 42 pounds per cubic foot for hemlock, and 32 to 36 pounds ..., Most covers will be use 3x3 or 4x4 posts, though 6x6 is available for extreme heights or snow load conditions. Color matched top and bottom brackets are also provided. The available post options include: 3" x 3" x .078" Extruded Aluminum - 8', 10', 12' lengths. 3" x 3" x .125" Extruded Aluminum - 8', 10', 12' lengths., Sep 30, 2013. Steel Weight. In summary, the stand will be able to support a tank that weighs 1600kg or more. The stand is made out of 2mm thick steel square tubing, and will be able to support the weight with the help of 4 legs and 2 beams. The stand is able to withstand compression and tension, and will not collapse under the weight of the tank., When it comes to sending packages or letters within Australia, understanding the factors that affect postage rates is essential. One of the most significant factors that determine ..., Sep 30, 2013. Steel Weight. In summary, the stand will be able to support a tank that weighs 1600kg or more. The stand is made out of 2mm thick steel square tubing, and will be able to support the weight with the help of 4 legs and 2 beams. The stand is able to withstand compression and tension, and will not collapse under the weight of the tank., According to Fortress Building Products, most decks that are built with traditional pressure-treated wood frames (or southern yellow pine) and decking boards can hold up to 50 pounds per square foot (PSF). So then, if your deck has 100 square feet, it'll support up to 5000 pounds. However, this method only works with a traditional wood deck., How much weight can a 6×6 treated post support? A 6×6 with 12′ span can support 2000 lbs. if you assume a conservative 1400psi bending stress. If you do a good job bonding the two members together, your double 6×6 can support more than 4,000 lbs. How much weight can a 4×4 support vertically?, For example, if you’re asking how much weight can a 4×6 hold, the answer will depend on several factors, including the species of wood, the moisture content, and the type of load being applied. In general, a 4×6 made from standard construction-grade lumber can support a static load of up to 4,000 pounds, or a live load of up to 3,500 pounds., A fence with 4×4 fence posts standing vertically and properly anchored in the ground can hold a weight-bearing load of approximately 10,000 pounds. Likewise, a 6×6 fence post can hold about 24,000 pounds. Steel posts can withstand 360,000 pounds of force; with vinyl withstanding 165,000 pounds. Each kind of fence post has its own purpose, and ..., Weight supported by a double or triple wood header on two 4" x 4" posts: Wood Headers - Max. Supported Weight. Span. (feet) MAx. Weight (lb) 2 x 2" x 6". 3 x 2" x 6"., Weight: 123.4 kg: Dimensions: 16 × 8 × 8 in: Available Finishes: Bandsaw Finish. Related products. Wood Grade: Appearance. 8″ x 8″ – 16′ Yellow Cedar Weight: 123.8 kg. 8" x 8" posts make a statement, heavy duty and chunky looking. Suitable for a garden pergola, arbour, or gate posts. This product is green (wet) and is best suited for ..., texdroid. • 4 yr. ago. Use 2x4s sistered together. Glued and screwed) That is stronger than a 4x4. 2x4 as a post will support about 1000 lbs, that varies a bit by species. If it is stamped "stud" it will be strong enough. Use 4 sistered pairs as your corner legs. Run 2x6 or 2x8 on edge like a header to join your legs., What is it you're buidling? Perhaps we're mixing up the words. The material you use to support vertically are your posts. Anything going horizontal is a beam. For posts typically you'd want 6x6 for heights reaching 10'. I have 9' height on parts of my deck being supported by 6x6x16' posts buried 4' in the ground with proper footings., You’re right, vertical splices in posts need special attention, especially 1) when the posts are 20-22’ long, 2) when they support decks or spaces where people can gather, 3) where cars can impose “extra” load on old existing footings, and 4) lateral displacement depending on seismic activity or seasonal ground movement, 5) how …, It is also good to know what factors may affect the span of a 2×8. But first, generally, how far can a 2×8 span without support? Depending on various factors, the maximum span for a 2×8 floor joist is 16' 6". The maximum span for roof rafters is 23' 9". For headers, the maximum span is 11' 2". Finally, a single deck beam has a ..., SKU: 80110088. 8" x 8' Wood Round Post - 8TBDLP-8. $4499. Quantity. Free. In-Store Pickup. Please select a store to view availability. Select Store. Add to Cart.