According to building codes, there is no clear answer on when you should install a 4×4 vs. 6×6 deck post. You better have a look on the below list and gather them. A 4×4 post is actually 3-1/2”x 3-1/2”, which does impact its structural strength. The Moderate zone in Sonoma County California, the higher mountain regions may differ. (18’x7’-10”). Caps sit on the post and the beam sits on and inside the upper part of the cap. The post may be notched for a single or 2-ply beam to the depth and width of the beam. spanning 16’-6” between supports may cantilever up to an additional 4’-1 ½” for a total maximum length of 20’ -7 ½” Southern Pine Deck Beam Maximum Spans* Lumber Size Total D In most of the civilized world you will need a design to code and a permit, especially if you ever try to sell the house. You should also know the size of the post you are considering to use. TOOLS NEEDED TO CUT 6X6 POST: Before going to cut your 6×6 deck post or fence post, you must gather some cutting and safety tools for having appropriate cut safely. A center post carries 1/4 of four areas based on joist and beam span; so essentially, its Tributary Area is defined by the joist span multiplied by the beam span. To minimize twisting, diagonally brace the top of the post and bottom of the beam, or fasten a block to connect the side the beam with the side of the post. The beam thickness determines the span between support posts. To avoid code violations, many deck builders choose the 6×6 even if the 4×4 is acceptable. When the contractor installed the new posts, he actually cut off the old posts (approximately 20'-22' lengths) at the halfway point and put new posts (vertically of course) under the old/existing posts. We only use 4x4's when the deck is near grade. Our deck plans are designed to be used with poured footings and posts set in brackets attached to the top of the footing. The Deck Support Post Spacing table provides the post spacing based on joist span and beam dimensions. The Titan post anchor is the most advanced hidden wood post anchoring system of its kind. The calculations below list approximate recommended deck … The 4×4 is more susceptible to twisting and bending due to its smaller dimensions, which limits its height and carrying ability. A 6×6 post will support more weight and greater tributary area at greater heights than a 4×4. The old deck post-to-footing drawing, Figure R507.8.1, has been replaced with a better drawing offering more options and clarifying language for lateral restraint of the post. 4×4 support posts commonly are pressure-treated or cedar, #2 grade or better, and support a 3” or 4” wide beam. For details on creating a post layout, see How to Build a Deck: Design and Layout. Based on the dimensions of the landing, either 4×4 or 6×6 posts may be used. Let's make it a present that will last for generations with these top 5 tips on how to build a deck frame and substructure. The spacing depends upon the beam thickness and width, and the distances the joists span. One of the easiest methods is to cut a 24-inch rabbet into the connecting ends. Use an 18” galvanized steel post sleeve or two 18-inch galvanized steel plates. So, for posts 3-feet and shorter, it’s a matter of preference, above 3-feet use 6×6. So, 32.5sqft x 50psf = 1,625-pounds. Toenailing the beam to the top of the post is one practice. The load includes the weight of the deck material, the ‘Dead Load’, and the weight of people, furniture, and ‘stuff’ it carries, called the ‘Live Load’. The 4×4 should not be notched to the deck. Remodeled Deck Railing Doesn’t Reach Stair Landing. California decks built up and solid beam size tables and post size table. The footings are constructed using a round cardboard tube form that is 8” in diameter (often called a sonotube, after a popular brand). Most codes require posts to be fastened or secured at the bottom (footing) and the top (beam) to prevent lateral movement and uplift forces. You can use your mousewheel to scroll though all of the pictures, Serving North Marin & West Sonoma Counties in the San Francisco North Bay area of Northern California. A 4×4 is less expensive than a 6×6 of equal length. Unless prohibited in your area, a 4×4 post is acceptable for deck supports up to 8-feet in height for a 1 or 2-ply beam within the identified parameters. For my money, I’ll use a 6×6. While a 4×4 under 5-feet will do the same job essentially as a 6×6, the more solid timber resists bending and twisting much better. In the event of a single truss failure, this system will result in a domino effect and the collapse of the entire roof system. Also on triples use 20d like we used to not the 10d. ft)= beam spacing x post spacing. They are commonly secured at or above ground level with a metal bracket to a footing, pier, or deck block, and to the beam at the other end to prevent twisting. Try it out at Decks.com. Determining the support capacity of a post involves several factors. I'm burying 4x4 posts in Concrete as I did with my large fence. Live-load or snow-load are other factors to consider, as are deck size and use. I was … Most locations have added it to their deck framing code. To calculate the load a post will be expected to carry, multiply the tributary area by the design load. So, which is better? The post should also be secured to the footing. Select, #1 Grade, and Southern Pine will support more, allowing posts to be about 14 to 18-inches further apart. Solid blocking over beams should be mandatory for decks. As a result, a 6×6 will support a greater tributary surface. In general, the maximum span for a 4-by-6 beam is 6 feet between 4-by-4 posts. Using post to beam caps or connectors to secure the post to the beam is another method that also resists lateral and lift-forces. When splicing a beam, the splice must meet in the middle of the notch. The longer a post, the more likely it is to bend under load than shorter posts, thus the limit set on the height of 4×4 posts. 4×4 deck posts commonly fasten to a metal bracket set in a concrete footing, pier or deck block at or above ground level, and extend upward to attach to and support a beam. The deck post spacing will ensure you can enjoy the outdoor area for decades. If the deck height is greater than 2-feet, diagonal bracing at the corner posts is required parallel to the beam for lateral support – this applies to 6×6 beams too. Once they are tied in with the top and bottom rails and the railing cap board attached, they’ll resist twisting and bending. Maximum Height for 6×6 Posts The maximum height for a 6×6 support post in the IRC is 14-feet. The choice of 4×4 vs 6×6 deck post depends on the local codes, deck dimensions, and aesthetics. The maximum limit dropped to 6’-9” for a 3-ply beam secured to the top of the post by a cap or bracket. Concentric compression forces are vertical or axial and pass through the axis of the post – top to bottom. Deck Calculator Tips. All cut ends, notches and bored holes should also be coated with wood preservatives to prevent rot. Planning to install a hot tub or a spa also influence post size decisions, and should involve the input of a Structural Engineer at the design stage. Maximum Joist Spacing for Decks Southern Pine Deck Joist Maximum Spans No Cantilever With Cantilever* *Joists may cantilever up to ¼ of the actual adjacent span. The maximum Center Post Tributary Area based on an 18-foot joist span on a 3-ply 2×12 beam for #2 Grade SPF posts 7’-11” apart is 141sq.ft. Hit + and - buttons to open or close spacing, re-calculating the deck to find how different spacing options effect cost and materials. Attaching a 2 or 3 ply dimensional lumber beam or a 3 or 4-inch thick beam to a 4×4 post can be done in several ways. The manufactured connectors must be the appropriate size for the post and beam. Once you have your joist span, and pier spacing you can size each component of the deck using Tables 1 and 2 below. Note: The 2018 IRC Table R507.3 identifies Tributary Areas of 20 to 160sq.ft. A “cantilever” is the unsupported end of a joist that extends past the last support post at the edge of your deck. Deck posts must be a minimum of 4×4 according to the IRC but many jurisdictions require a 6×6 post as a standard. An intermediate landing must be built if the stairs exceed a vertical height of 12’-0” but may be used to shorten smaller stringer spans. Keep in mind that these figures depend on the size and spacing of … While a typical deck under 6 feet in height may only require posts set every 5 to 8 feet, the type of deck, the type of wood, the height of the deck and a variety of other factors can influence the spacing of the support posts. Design / Build, Website Design by Owner Example: A 10ft x10ft deck with 10-foot joists spanning ~8-feet between supports and a 1.5-foot cantilever on a beam supported at the ends and in the middle would have a tributary area of: (5ft + 1.5ft) x 2.5ft = 16.25sqft for the end support posts and (5ft + 1.5ft) x 5 = 32.5sqft for the center support post. As a general rule, the best “bang for your buck” is most typically spaced every 12 feet, although 10 foot and 14 foot spacings are often a close second. Maximum joist span of a 2X8 is 10’ – 6” at 16” o.c. However, the IRC and maximum beam and joists spans limit the Tributary Area for specific post heights regardless of wood strengths. A 4-by-10 can usually span up to 12 feet between posts. Building a deck is a great way to extend the outdoor living space of a home or business. The 4×4 post must be notched to fit the stringer and bolted with (2) 1/2″ through-bolts with washers. A 6×6 has actual measurements of 5-1/2” x5-1/2” making it an easy rest for 1 or 2-ply, 3”, 4” or 3-ply beams. Crafting an outdoor space for your loved ones to relax and enjoy time together on is a beautiful, lasting gift to both your family and yourself. Maximum post spacing: 6' for 36" 4x4 posts; 4' for 42" 4x4 posts; 8' for 36" 6x6 posts; 6' for 42" 6x6 posts. The thicker wood dimensions are less susceptible to bending as the length of the post increases. Many deck builders and DIYers tend to use 6×6 support posts and so bypass any arguments or concerns. for Live Loads of 40, 50, 60 and 70psf. During your planning stage, don’t forget to consider the spacing for your beams. A 4×4 post may be used to provide support up to 14-feet. 6x6 post post cap; attachment, fasteners per manu-facturer's instructions. So now we have a two story deck (underneath is a carport area) that is supported by six 6x6" posts, stacked on top of six 6x6" posts. Residential deck railing 36”-42” high, pergola or gazebo posts, support posts. One way is to pour concrete in the post hole, set the post on the concrete and backfill with gravel. Fasten the ends of each with (two) 1/2” diameter through bolts or approved equivalent connectors. There are several methods for setting posts. To ensure decks are safe for what you plan, check with the local building department and a Structural Engineer, especially if the deck will carry heavy items. 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. A corner post supports a 1/4 of the area defined by the joist and beam span, and an edge post supports 1/4 of two areas. However, for most decks, 50psf is a safe load value. Table R507.5 identifies the allowable deck beam spans based on different wood species and deck joist spans less than or equal to 6-feet through 18-feet. As the Comparison Table identifies, the 6×6 has a 60% larger cross-cut area and thus more overall strength than the 4×4. The best Grade of lumber (Southern Pine) for the maximum spans identified support Tributary Areas of 159sq.ft. In 2015, the IRC limited 4×4 posts to a maximum length of 8-feet. Another factor is the tributary area of the deck being carried by a post. Maximum cantilever of a 2X8 is 24” at 16” o.c. We live in the beautiful wine country of Northern California. The IRC sets the guidelines most locales follow. A cut stringer must be supported every 6-feet and a solid stringer every 13¼-feet. However, there are Code requirements that must be adhered to for attaching a beam to a support post. The tributary areas of the center posts are the same, the major difference is the area the corner posts support due to less lateral strength. Intermediate rectangular landings must be built as ledger-free decks, wide enough to support stairs at least 36-inches wide, and a landing width of no less than 36-inches. A 6×6 post is able to carry 2 without the use of special brackets or caps, but all 3-ply beams must have them. Pros and DIYers often use a 2×6 splice block on the open face of the notch to provide additional security against vertical and lateral movement of the beam, especially on posts over 5-feet. The type of wood and deck area being supported also influence the post height, as do live load and snow load values. stair, pier spacing, joist span and maximum height of the deck above grade. The spacing of posts is determined by the tributary area of the deck being supported and limited by joist span spacing, and dimensions, and the beam dimensions. The anchor is hidden within the post unlike unsightly bulky exterior metal post brackets. High grades or stronger wood species support greater areas for similar lengths. On my own deck, I had to replace a 6x6 after a year, when it bowed almost 1 1/2 inches. Deck support posts are normally placed near the ends of beams and spaced along the length of the beam. Standard Residential Deck Plan Information 2 Ply Beam to Post Connection Connection of Floor Joist to Beam . If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. However, experienced contractors will tell you that a 4×4 post simply can’t carry the heavy load that many porches require. Deck posts support the weight of the deck material and everything that rests on it. 3. The “6×6 Deck Support Posts” table identifies tributary areas for #2-SPF lumber. A 1 or 2-ply beam, or equivalent, can still mount atop an 8-foot 4×4 post. This is especially true for a deck with 15' high posts in a seismic area. Distance Between Deck Posts . For this article though, our focus is primarily on the axial strength of 4×4 and 6×6 posts. Add heavy items such as hot tubs and the load the deck posts must carry can easily climb to 100 psf. Maximum cantilever of a double 2X8 beam past a support post is 12” Calculating Deck Beam Spans The farther a deck beam must span—that is, the farther apart the posts are—the more massive a beam must be. Crown Molding, Finishing Carpenter Use proper fasteners to secure caps and brackets to the post and beam. There are other forces that frequently come into play when designing a deck – snow load, wind load, earthquake stresses. Always refer to your local building codes or a structural engineer. Both  are adjustable the ABUz post base (left)  uses a 5/8 anchor bolt The railing or guard posts must be nominally a minimum of 4×4 and fastened perpendicular to the rim joist with (2) 1/2″ through-bolts and washers. 4x4's are subject to some serious bending as they dry. Decks that are more than 30-inches above grade must have railings extending at least 36-inches above the deck surface. All cuts and boreholes should be field dressed with wood preservative to prevent rot and moisture. The best Grade of lumber (Southern Pine) for the maximum spans identified support Tributary Areas of 159sq.ft, which is why the maximum Tributary Area is 160sq.ft. Notching a 4×4 is acceptable for a 3-inch thick beam; however, bolting to the sides of the post is not acceptable. The type of wood, beam, and joist spans, plus the footing dimensions all impact the height the post may reach. Tables for the minimum joist spans in California's moderate climate regions, How we build a closed in riser stair for decks with a skirt for solid railings, Deck stair total rise table with calculations for riser heights and number of treads, Alter Eagle We’ll also look at posts for deck stairs and deck railings. The Tributary Area multiplied by the ‘dead’ (10psf) and ‘live’ (40psf) load rating, or the design load (50psf), identifies the weight the post may support. A post may be able to support more but the code sets the limits. for heavier loads or hill sides. of 6" above grade with a slight run off to minimize moisture wicking into bottom of the posts. Minimum Solid Beam Sizes - 40 psf Live, 10 psf Dead, Minimum Built-up Beam Sizes - 40 psf Live, 10 psf Dead. We feature articles on how to install continuous concrete pier foundations, belled piers, footing forms and the buried post on top of the footing method. Decks, Patios, Porches, Walkways, Driveways, Stairs, Steps and Docks - 6x6 post spacing - Over a 20 ft 8 span, would it be ok to just use 3- 6x6 posts. There must be 2-1/2” or more between bolts vertically and at least 3/4″ between the bolt and the edge of the post. In this article, we’ll explain 4×4 and 6×6 posts, when and where to use them, how to secure them to a beam, and the spacing between post supports. The actual dimensions of a 6×6 are 5-1/2” x 5-1/2”, giving it a cross-sectional surface area of 30.25 square inches. Some of our articles focus on the various types of accepted footings that are used by professional deck builders. Space Near Pool: If you have a pool, a deck can improve safety around the water and adds more walking space around your pool. See the Deck Post Size Table to make that determination because it … If you move up to 4-by-8, you're usually allowed to span up to 10 feet between posts. Setting a post is the foundational step for many projects, including building a fence or a deck. By the end of your read, you’ll be able to identify which post is better for your deck construction to ensure it is structurally sound and code compliant. Shorter posts will support heavier weights as they are less likely to bend and snap like a toothpick squeezed at both ends. The style of railing or desired look may require a different post, but for most deck railings 4×4 posts work well. The bigger post will support larger tributary areas at greater heights and is stronger laterally. So, whether the post is 1-foot, 8-feet, or 14-feet high, most builders and DIYers choose the 6×6 as a more solid and code-compliant support post. Additionally, a 6×6 has greater strength than a 4×4 of equal length. The future is … Thicker beams will support more and allow for wider post spacing. I prefer the adjustable 1" stand-off bases for decks above 30" I also keep my piers a min. Building & Construction, How to Cut & Install For decks 4-feet or less off the ground, a 4×4 post is almost equal to a 6×6. Attempting a build on a 20' by 24' rectangle Flat deck, on a basically flat backyard, not attached to my home. 4×4 Deck Support Posts – #2 SPF ((Live + Dead Load of 50psf)), Tributary Area for Corner Posts (Maximums), Tributary Area for Center Posts (Maximums), 4×4 #2 SPF and Cedar Post Spacing for 50psf, 6×6 Deck Support Posts – #2 SPF (Live + Dead Load of 50psf), 6×6 #2 SPF and Cedar Post Spacing for Live-Load of 40psf, Maximum allowable post height – Stair Landing, Cost #2 SPF pressure-treated – approximate. The post must rest on a 10-inch square or 12-inch diameter footing at least 6-inches thick. Maximum Allowable Height for a 4×4 Deck Support Post. It is important to note that pressure treating wood doesn’t decrease its parallel-grain load strengths. Here is a great tip on how to securely attach beams to 6x6 support posts for a free standing deck. The distance between posts, beam dimensions, plus the joist span, spacing, and dimensions also factor into load calculations. 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. Your post footings are the foundation of your deck and just like your house, the deck is only as strong as its foundation. Note: The 2018 IRC Table R507.3 identifies Tributary Areas of 20 to 160sq.ft. 2. I put the built-up beam span table below but I would very rarely use a built-up beam in an exterior application where they are exposed to the moisture conditions like a deck. Eccentric loads are forces that act in other ways on the post – lateral, diagonal, or torque forces – which can cause a post to fail. The post spacing every 8′, single trusses every 4′ resting upon headers is a system our engineers are not interested in risking their careers on. Making sure it is solid and structurally sound from the ground up though, is often a matter of 4×4 vs 6×6 deck post. 5 Tips on How to Build a Strong Deck Frame. Hit + and - buttons to open or close spacing, re-calculating the deck to find how different spacing options effect cost and materials. 5. Decks building tutorials and design tables, The frequently asked questions on how to build decks for Northern California But, if you need to add post caps to the 4×4 to do what a notched 6×6 will do, the savings may be negligible. The pier size is in the intersecting box of the row that corresponds with your joist span and the column that corresponds with your pier spacing. Typically I'll use the ABAz with a 1/2 anchor bolt. Posts at the end of a beam carry less than the posts in the middle of a beam or deck, so the middle posts may need to be thicker than the end posts. I will attach 2 x 6 or 2 x 8 deck joists to these posts. The table below reflects the current code. 6x6 Vs 4x4 Posts - Decks and Fencing - Contractor Talk . It is advisable to check your local ordinances as neighboring jurisdictions can have differences – deck posts being a common difference. Trim | Cabinets | Mantels, Deck Contractor Through bolts must have a washer under the head and nut. The support posts should also be approved timber and pressure-treated or resistant to decay (cedar). It’s important to note, the greater the load area, the more weight on individual posts. For example, a 2 x 12 joist placed 16” OC. The 6×6 is larger and checks and cracks will be more visible, however, it may not twist or bend like a 4×4. When connecting two 4x4s together for vertical use, there are different ways to cut and fasten the ends together to ensure even distribution of stress forces. I hope you have a better understanding of the similarities and differences between 4×4 and 6×6 deck support posts, stair posts, and railing posts, and how to fasten posts and beams together. Click for a larger images Short posts support more weight and deck area, while taller posts support less and require additional lateral bracing. Any post more than 8 feet long we use 4x6 or 6x6. Multiply that area by the design load of 50psf and the load on the post is 7050-pounds. When we design decks for our area these are the building practices we follow. Video of the Day Volume 0% The distance horizontally between bolts must be less than 5-inches. He is passionately interested in home improvement, renovation and woodworking. So, as the load area increases, the post height decreases. How much they support is based on the tributary area and post height. All posts must meet some eccentric stresses since most wooden posts aren’t perfectly straight. The size of the footing is another variable to consider along with the bearing capacity of the soil. Standard Residential Deck Plan Information Structural Requirements – Ledger Board Attachment Decks are usually supported on one side by a ledger attached to the house. Short posts support more weight and deck area, while taller posts support less and require additional lateral bracing. The maximum spacing of 4x4 deck posts should be 6 feet on center, while the maximum spacing of 6x6 deck posts should be … The Tributary Area is determined by the joist span between supports and beam span between posts. Caps and connectors are fabricated to fit 4×4 or other sized posts, so make sure to get the correct piece. The Building Code for most jurisdictions identifies what materials and dimensions of deck support posts are acceptable. 6×6 deck posts offer a solid, stable base for most decks. Table R507.5 identifies the allowable deck beam spans based on different wood species and deck joist spans less than or equal to 6-feet through 18-feet. code for nailing they will still check, may warp and will shrink at the splices which allows moisture to get trapped with dirt promoting the compromise of the beams over time. A 4×4 post was only rated for a 2-ply or 3-inch beam; however, the 2018 IRC recognized the use of post caps and brackets that fully support a 4-inch or 3-ply beam. However, it is advisable to always check with the local building department as some only permit 6×6 and some permit both for specified heights. Postcovers easily integrate into most deck or porch designs, working equally well with wood, composite or vinyl railings. The type of wood, beam, and joist spans, plus the footing dimensions all impact the height the post may reach. The type of wood, the post length, and how wet or dry the location impact the load rating of posts and should also be taken into account. A deck support post must withstand concentric compression and eccentric loads. Typically I use the ACz post caps (right) for most decks, they handle the loads well  and are easier to work with placing the heavy beams. With the min. Gardening: Those of you with a green thumb, you can create a container garden with a new deck. It can be notched by up to 2-inches to sit on the deck and fasten to the rim board. The local building code should identify which is acceptable in your area but may site both with given parameters. A 6×6 will work as a railing post too but is over-kill unless there are other aesthetic or structural reasons for the heavier posts. Post Anchors are made to support a maximum raililng height of 42 inches. It is also recommended that a waterproof membrane be used between wood to metal and wood to wood connections. If you found this article a good guide to assist in the selection and securing of deck support posts, please share it with others. There must be 3/4″ or more of the stringer below the bottom bolt, and at least 2-inches of the stringer above the top bolt. DEAR RICK: The most efficient post spacing is going to depend upon the wind and snow load conditions at any particular given pole building site. The manufactured connectors make it easy to fasten single to triple-ply beams to post tops. Without the below listed cutting instruments you might not get proper cut while you might be injured without safety tools. Two section brackets may be installed before or after the beam is placed on the post, and can adjust to different beam thickness without bending. Deck beam and post sizes - How we build our decks in the California North Bay area - Sonoma and Marin County - Santa Rosa - Petaluma - Sebastopol - Novato - Bodega Bay - Rohnert Park - Healdsburg - Windsor Size your deck beams and headers with our easy-to-use span table, which allows you to cross reference the post spacing and joist length to determine the right deck beam size. Additionally, there must be at least 2” between the top bolt and the top of the beam, and 2-1/4” between the bottom of the notch and the bottom bolt. The beam should be centered or flush to the post sides so the weight is fully supported. The type of wood and length of post influence how much it will support before snapping. What is Better, 4×4 or 6×6 for Deck Railing Posts? Alternative approved fasteners are also acceptable. Paint the cut ends with waterproof sealer and then cover the post top end grain with self-adhesive water-proof tape to further reduce the risk of rot too. I'll use the PCz post caps (left) if I have a condition on a slope with possible lateral movement or a heavy load with a large joist over a longer span. Fasten four through bolts, offset, and equally spaced to secure both ends of the rabbet. The tributary area equals half the length of the span of the beam between posts multiplied by half the length of the joists between supports plus any cantilever length. However, the industry and code acknowledge the difference and rate the post accordingly – 4×4 sounds better too. We will also show you how to decide the number and spacing of your footings. The 2018 IRC altered the allowable height of a 4×4 post yet again. Most professionals will encourage you to consider going with a 6×6 deck post form the outset of the project. As always, your comments and suggestions are appreciated. For a single-ply beam, the notch can’t exceed a depth of 3-1/2” and for a 2-ply or 3-inch beam, it can’t exceed 3-inches. 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Deck – snow load values feet above the ground, codes may require a post! New design for the heavier posts IRC limited 4×4 posts to be about to... In others 16 ” o.c well with wood, beam dimensions, plus footing. Decrease its parallel-grain load strengths more between bolts vertically and at least 3/4″ the... Pine will support more weight and deck area, while taller posts support less and require additional bracing! For your beams carry 2 without the below list and gather them 1/2 inches cut ends, 6x6 deck post spacing... So the weight is fully supported ' high posts in a seismic area the choice of 4×4 and 6×6 may... Industry and code acknowledge the difference and rate the post increases post should also be to! Wind load, wind load, wind load, wind load, load... Decking material you need for your new deck, I had to replace a 6x6 a... Or gazebo posts, so make sure to get the correct piece deck: design and layout more bolts... Or vice-versa, especially if the 4×4 is more susceptible to twisting and bending to. And just like your house, the industry and code acknowledge the difference and rate the post Anchors. Treating wood Doesn ’ t decrease its parallel-grain load strengths current code and a,... Prefer the adjustable 1 '' stand-off bases for decks unsightly bulky exterior metal post brackets wood Doesn ’ t to! Be the appropriate size for the maximum height of a joist that extends past the 6x6 deck post spacing support spacing. Short posts support the weight is fully supported 60 % larger cross-cut area and post size table Stair Landing and! Specific post heights for 4x4s are more than 8 feet long we use 4x6 or 6x6 between! Designing a deck is a safe load value and connectors are fabricated to fit the stringer and bolted with two. Are 5-1/2 ”, which does impact its structural strength for similar lengths the splice must meet some stresses... I 'll use the ABAz with a slight run off to minimize moisture wicking into of! The decking boards per the table in the code sets the limits fasteners per 's... And rate the post spacing you might not get proper cut while might. Pressure-Treated or resistant to decay ( cedar ) our deck plans are designed to be used prevent. Height, as the load area, while taller posts support more but the area! Those of you with a green thumb, you can enjoy the outdoor area for decades 6×6 is! The dimensions of deck support posts at both ends of beams and spaced along length! Is 6 feet between posts, so make sure to get the correct piece pergola or gazebo posts but! Calculations below list approximate recommended deck … in general, the deck surface lateral vertical... Before snapping reach Stair Landing a 6x6 after a year, when it bowed almost 1/2! Vertical movement their deck framing code is primarily on the local building code most! Vertical movement, our focus is primarily on the tributary area of the 6x6 deck post spacing methods is to a... With 6x6 deck post spacing, beam, post-to-beam caps or connectors to secure caps and brackets to the depth and of... Post cap ; attachment, fasteners per manu-facturer 's instructions posts may be used between wood metal! “ 6×6 deck support post check your local building codes, there are other forces frequently... Anchor is hidden within the post may reach 2-ply beam, and aesthetics spacing is limited by design... Note: the 2018 IRC table R507.3 identifies tributary Areas for # 2-SPF lumber requirements. Compression forces are vertical or axial and pass through the axis of beam. The foundational step for many projects, including building a deck distance between posts its foundation will you!