This calculator determines the size of each tributary area of your deck. Let’s say you are building a 12’ x 8’ deck, with railings on only two sides. However, if your deck will include a hot tub or roof, you must support that weight with additional footings. weight of the structure you are building. If your deck ranges between 24 inches and 30 inches from the ground, local building safety codes require your deck to have a railing that is at least 3 feet (36 inches) high, extending from the deck’s surface to the top of the railing. This article explains and includes a video for how to use this online calculator for deck joist options. The standard rule for footings is that for a basic deck, the larger the beam and footing size, the fewer footings you'll need. The future is … The main Navigation tabs at top of each page are Metric - inputs in millimeters (mm) For Inch versions, directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version. For help, simply click on the(?) Need help figuring our exactly how many balusters you need for your deck project? ft . There are three ways to determine deck joist span and spacing – formula, calculator, and joist sizing and span tables. At Narangba Timbers You Get Expert Advice for Your DIY Projects Our online tools are designed as a guide for the average DIY’er, but when you come into or call Narangba Timbers on (07) 3888 1293 , we will go over everything with you to make sure you have everything you need. For furniture and people, use 40 psf (pounds per square foot), and structural materials or dead load, add 15 psf. Calculating the space between the railing posts is the first step in the railing installation process. The American Wood Council (AWC) has an online calculator that can be used to calculate the size and grade of joist needed for a given joist span, on-center spacing, live load and dead load. Feet: Inches: Step2. Sizing deck beams got a lot easier with the publication of the 2015 International Residential Code. The Titan post anchor is the most advanced hidden wood post anchoring system of its kind. For help, simply click on the beside the section you need help with, Or watch this Tutorial Video. If necessary, adjust number of deck boards to match in both calculations, and see if different board gaps at each end of deck are acceptable, compared to equal gaps and cutting the … If you are planning on installing a hot tub or porch on top of your deck, you will usually need more footings and posts to support the additional loads. This calculator is intented as a guide. Deck builders can now refer to Section R507.6 Deck Beams and Table R507.6 Deck Beam Span Lengths to determine the size of 2-ply and 3-ply built-up beams made from 2×6 through 2×12 lumber. Since the posts will determine the spacing of the balusters and the structural integrity of your railing, correctly installing the posts is critical to ensuring the rest of the railing installation goes smoothly. stair, pier spacing, joist span and maximum height of the deck above grade. Our helpful baluster spacing calculator will determine the exact range between the first post in your level railing section and each individual spindle. There is no minimum span, and maximum spans can reach up to 15’. Learn how to use different methods to calculate spacing. Calculate Deck Joist Span and Spacing. In general, posts should be spaced no more than 8 feet apart. Default is 50 psf which you can change. Distance Between Deck Posts . AG-CO is not responsible for inaccurate data entry resulting in product failure due to overloading. - Beam splices are recommended to occur over posts or support only. Timber Decking Calculator & Timber Flooring Calculator When you are building a timber deck or installing new timber flooring you want to be certain you buy enough timber at the outset, as there may be differences in the colour batches of the timber you purchase if you purchase in multiple lots. Installed balusters should withstand 50 pounds of pressure exerted over a 1-sq.-ft area. To calculate the square footage of the deck, multiply the two numbers together: 20 ft * 13 ft = 260 ft². 6.4 - Check regularly that the boards are square and adjust the spacing if necessary. In our example, we can look at any post/footing to determine its tributary area. You chose a board which is 8 ft long and 6 in wide. Enter Length Between End Posts, Baluster Width and Gap Size to calculate required end gaps to maintain spacing. Default is 50 psf which you can change. - Beam splices are recommended to occur over posts or support only. However, if you’d like your deck farther out where there’s more space, you can install a detached deck. Default is 50 psf which you can change. Calculating Deck Joist Spans The required width of a joist depends on its span: how far it must travel between beams or between a beam and a ledger. Determine what size deck beam you need based on your support post spacing, as well as the proper concrete footing diameter, with our beam span calculator at Decks.com. If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. Even though we have based the calculations on the IRC, you must always check with local building codes to ensure there are no variances. These posts divide railing into sections, where spindles or balusters are placed to provide a safety barrier. Starting with your perimeter, mark the location of each deck post to locate the fitting position. Remember to take post spacing into consideration as well. Adjust building width or post spacing to reduce load. - Provide mid-span blocking where joists span are over 6' 11". 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. Measure the length of your level railing section, post to post. The decks mentioned above assume you’re building an attached deck. Pier Spacing 6 8 10 8 10 dia. Click here to determine the size of footing you need for your deck posts. Deck balusters ensure a sturdy wood railing – that is, if they're spaced correctly. Home > Rail Calculator. The size of the deck directly affects the spacing of the support posts. Variety of colours available; Fade, warp, rot and splinter resistant; No need for oiling or staining; Use for decks of any height; Made from bamboo, timber and recycled plastic A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. 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