I am going to be building a deck around a pool this spring. Finish your decking posts with post caps or ball tops. Just follow the instructions below and once you know how many boards you need, nip over to our online shop to see our complete range of decking boards. If you're unsure ask for assistance in store, and make sure you bring your deck plan with you. A shorter beam span means more deck support posts. He also shows how with a little additional detailing work, his deck support posts reflect his pride in craftsmanship. For most situations, you will want to place footings and posts less than 8' apart. Terms of use. Of course, the latter will cost more. After all, hot tubs, full of water, and people can easily weigh over 5,000 lbs. Don’t set deck piers or footings above ground A span is the unsupported distance between two posts. 3. Install a post cap, also called a post-to-beam connector, onto the beam or doubled joist above; use a level to be sure it is plumb with the post base. Step 15. Work out how many posts and rails you need. And if a deck is over 10 feet tall, you should install bracing. Find the number of posts by measuring the running linear feet and dividing by 8 feet plus 1 for the end, plus 1 more post for the steps, totaling 8. Don't burn your wood off-cuts as timber treated with preservatives can give off harmful fumes. You can try to drill holes in concrete with a standard 3/8-inch drill, but it will be very slow going. Pull out most of the dust by lifting the drill bit quickly as you drill, two or more times. Deck Design Software. The packaging will tell you the size of the drill bit to use, as well as how deep to drill the holes. The added support posts should be no more than 30″ apart & ideally placed in poured concrete. Rules like this may seem arbitrary, but they’re in place for safety purposes, and to ensure reasonable access to key parts of your home. Use the nail gun to secure the bearer to the support post. COVID-19 Update to Customers ... At the other end of the bearer, place a support post on a flat, hard surface. Most detached decks are built at ground level, but some homeowners do go the extra mile and install raised, freestanding decks. The 17' is on each side of the pool and will circle out, at the middle of the deck the length of the deck will be 13'. Read our Buyer's guide to decking. There are two approaches to designing a deck and selecting the right-size components, such as correctly sized deck posts. 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 last board at an angle. 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 … Here is a list of some common joist sizes and maximum “spans”. Beams made of two or more pieces are usually at least as strong as solid beams of the same size. For aesthetic or symmetry reasons, more posts may be added. If you install the post the same day as you poured the concrete, the footing could crack. Making sure the bearer is level, mark its height on the support post. 4. And if a deck is over 10 feet tall, you should install bracing. 2. My question is, how many posts do I need in the ground for this deck to be sturdy. This is good if you are looking to save a few dollars; however, code will not allow you to space your deck posts as far apart beneath your beam when using 4x4s. The support post’s side should be flush with the outside of the beam or doubled header. To decrease … This means that using 225 x 50mm timbers a frame 4m x 4m can be built (12ft x 12ft) using 8 posts. Install the bracing every 16 inches. How to Slope a Deck for Water Runoff and Drainage, How to Attach Deck Post Bases to Concrete Footers, How to Connect a Notched Wood Post to a Beam, How to Install Concrete Support Deck Posts & Columns, How to Install Deck Post Wraps and Sleeves, How to Use Shared Load Deck Support Posts, How to Use Steel Metal Deck Support Posts and Columns. That means that once you have the footings in place you need to install posts - which will support the beams - that in turn support the joists – that support the decking – and eventually you, your family and friends. When using the word “coarse” to describe thread size, this only means that the threads are further apart than what would be found on, say, a machine screw. When evaluating the costs of garden deck installation, there are various things you need to consider. But these can bow seriously, even if a deck is only 3 feet off the ground. 1. Many people use natural wood timber for their decking frames. Most professionals will encourage you to consider going with a 6×6 deck post form the outset of the project. Use the widest dimensions for linear quantities. Add a gate to keep young children and pets safe in one place. That makes a total of eight posts that need to be installed on this average size deck. Or keep things simple with a complete railings kit. Deck Materials Cutting and Detailing Deck Support Posts Brendan Casey, Casey Fence and Deck – Frederick, MD. Fence Calculator ; Decking Calculator; Gate Calculator; Free Quote; Quick Order; Opening Hours; Our other sites: COMMERCIAL & HIGH SECURITY; FRANCE; 0800 408 2234 Hello Sign in. For that reason, we strongly recommend that you use 6x6s instead, even if your building department does not demand them. The farther a deck beam must span—that is, the farther apart the posts are—the more massive a beam must be. The maximum distance between footings is determined by the size of your joist material. Post caps: £2 to £7 each: Decking lights: £15 to £40 each: Steps: £50 to £215: Decking stringer: £12 to £28 per stringer: Joists: £6 to £12 each: Weed proof membrane: £30 per pack: Postcrete: £5 a bag: Cost Factors of Installing Garden Decking. In general, posts should be spaced no more than 8 feet apart. Many deck screws will not have the thread size listed, as the term “deck” usually indicates a coarser thread. Repeat this process for all of the posts on your decking. Lengths of posts , postmix and fixings are added Decking: The decking is supplied in the lengths that suit your job , these are calculated as covering 150mm (145mm for the board and 5mm gap for expansion and contraction) , any decks over the 5.4m long that are required are given in 4.8m lengths so there is as little joins as possible. According to building codes, there is no clear answer on when you should install a 4×4 vs. 6×6 deck post. This video shows how to install decking posts for an elevated deck. Anyway, the deck will be 16' 2" X 17'. I got a plan from Menard's, which is very confusing if you ask me! Learn how to install bearers and stumps for a deck with this step by step guide from Bunnings. For more on these, and other, decking accessories, check out our decking buyer's guide. Posts Required. Use a hand sledge to tap the 6x6 into place, check for plumb, and drive nails into all the hardware holes to secure the post. We have marked this onto the ledger and will temporarily screw a joist into position until we have marked the correct place for the post hole. The larger the beam and footing size, the fewer footings that are required. Roll out your landscape fabric and cut to size, making sure it’s as snug to the posts as possible and covering all of the area under the deck. Take any off-cuts to the tip. In the past, many decks were built with 4x4 support posts (also called structural posts). The standard rule for footings is that for a basic deck, the larger the beam and footing size, the fewer footings you'll need. Scribe a circle where the base’s lag screw will go. The decking posts need to be spaced at every metre in each direction. Use sleeve anchors of a size recommended for your post base. If using stirrups allow for at least a 75mm clearance between the ground and the bottom of the post. In the past, many decks were built with 4x4 support posts (also called structural posts). Top Tip. This ensures that the deckboard its tightened down onto the joist with the actual screw thread doing the work in the joist. If you are using a centre spacing of 1m for your posts, you can then use this simple calculation to determine how many posts you’ll need to buy – 1 + Decking Width (Metres) + Decking Length (Metres) + Total Sqm = Total No. Use a level to mark the post’s corners, then use a square or straightedge to mark its outline. "there should be no more than 2m between posts holding up the frame but 4m can be allowed between ends of the frame providing the joists are no more than 450mm apart. Our nifty decking calculator is just the job if you’re having trouble working out how many decking boards you need for your next project. Here we are working on the top tier deck and have temporarily screwed the joist into position so that we know exactly where the holes need to be. This video shows how to install decking posts for an elevated deck. Divide the area of your deck by the area covered by one pack to see how many packs to buy. Position the post base as shown with its inside area aligned with the pencil lines. So in this article, we’re exploring how to safely put a hot tub on an existing deck. They are also less … For that reason, we strongly recommend that you use 6x6s instead, even if your building department does not demand them. This article shows installing non-notched posts on top of concrete footings that rise above the ground, to support framing that has already been built on temporary supports. How to Figure Out How Many Posts You'll Need. I hope this is making since! If you're building a simple deck, footings and posts should be placed less than 8 feet apart. So build your deck the right way, from the ground and posts up. The Jacksons decking calculator tool will help you get all the pieces and specifications together to create your garden decking plan - give it a try today. Copyright © 2021 Trex Company, Inc. All rights reserved. But decks 2 feet or higher will need added support. A “cantilever” is the unsupported end of a joist that extends … The answer depends on the size and shape of your deck, the size of your footings, and the size of your beams. However, experienced contractors will tell you that a 4×4 post simply can’t carry the heavy load that many porches require. More info on fitting posts here- http://www.ultimatehandyman.co.uk/diy/decking/fitting_decking_posts.htmNormally on a hole of this size I would normally throw in at least one bag of gravel, but didn't have any at hand. If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. Install bracing cut from the same 2 x material you used for the joists — 2 x 8 for this deck — between joists in the middle of the frame to support parting boards. Some builders position them every 4 feet for a completely rigid frame. Use a crescent wrench or a socket wrench to tighten the nut, which will cause the anchor’s sleeve to expand so that it grips the concrete firmly. If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. 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 … Also, a home’s electrical panel must be at least 10 feet above any deck structure or at least three feet to either side of it. 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 last board at an angle. With the posts in place, you can remove the temporary supports. Step 14. In some places you need permission to build an elevated deck, some decks also require planning permission and need to be built in accordance with your local building code, so please check with your local building control office etc. For instance, a beam made of two 2x8s is probably stronger than a solid piece of 4x8. By clicking GO!, you acknowledge that you have read Trex's Privacy Policy. Step 3. Think of detached decks like an island in your large kitchen. The calculations below list approximate recommended deck beam spans. Use a hand sledge to tap the 6x6 into place, check for plumb, and drive nails into all the hardware holes to secure the post. For our design, we want to use 4 x 4 posts cemented every 8 feet and run them up through the deck to be used as the rail posts. Allow at least two days for the concrete to cure before drilling holes and installing a post. The outside run of stumps will need to align with the outside edge of the deck. Measure the distance between the two hardware pieces, then subtract 1/16 inch or so to account for imperfect cuts. Reposition the post base, aligned with the layout lines, and tap a sleeve anchor down into the hole. Building a deck might sound like a fairly straightforward task that anyone can accomplish, but there are a variety of elements that go into the planning stages to ensure the safety of the deck upon completion. PROStar, Brendan Casey of Casey Fence and Deck demonstrates how he saves time creating a jig to cut his deck posts. Or, if your deck has many angles, additional footings are necessary. Additionally, many municipalities allow 4×4 deck posts for decks up to 5’ in height. But these can bow seriously, even if a deck is only 3 feet off the ground. Deck post size is important. Many screws for decking will have ridges on the bottom of the head, which helps the screw to counter sink without too much effort. This meant using more postcrete than I would do normally! Work out how high you would like the balustrade to be. However, if your deck will include a hot tub or roof, you must support that weight with additional footings. Parting boards, also known as pattern boards, add a distinctive look and can eliminate the need to butt boards together to span the width of the deck. While natural wood can be used for decking frames it can defeat the object of of using long lasting maintenance free composite decking boards when your decking frame starts to rot after a few years. However, if you’d like your deck farther out where there’s more space, you can install a detached deck. Decking screws will have a clear shank at the top - which should be the depth of the deck board of choice. If setting timber post straight into the ground you may wish to coat the timber that comes in contact with the ground with some type preservative. Add gravel and smooth as you go. My Account. But there’s a lot more to know about hot tubs and decks. Use the widest dimensions for linear quantities. Save yourself time and energy by using a standard-voltage heavy-duty hammer drill like this one, which will bore down with ease. 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Where the base ’ s more space, you must support that with... Drilling holes and installing a post form the outset of the recommended size, a half inch or to.