Lumber quality also has a bearing on a board's strength. You can easily spot when a board is off. 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. All lumberyards and home centers carry 16-ft. deck boards, but many also stock or can order 20- and 24-ft. boards, though they may cost more. Quality wise, I prefer the 5/4 decking. x 6 in. Decking and railings: These are the most visible parts of your deck, so you'll want to use the best lumber you can afford. To estimate how much it will cost to build a deck, you need to decide on the types of materials you are going to use. "Select grade" or No. 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 … The amount of individual boards will depend upon the size and type of decking your choose and the amount of space you plan to leave between decking boards. x 12 ft. Pressure-Treated Hem-Fir Lumber is ideal for a variety of applications, including decks, landscaping, stair support, walkways and other outdoor projects where lumber is exposed to the elements. You will get most of any bounce on a deck from the span/size of the joists, not the decking, so one up your joists for a sturdy deck. There's a 'pocket' for the end of the boards at the back of the trailer. Another alternative is to create a ‘pattern’ on your deck so that the length of your deck seems to be reduced. If you have a saw mill close by, go get rough cut 2 x 8 oak, and treat it with some weather sealer before installing. The deck ledger, the horizontal framing member that connects the deck to the building forms the starting or reference point for the rest of deck construction. 6 Trimming deck boards to size Fig. Decking will not work, to thin. 45º Chamfer. As a general rule, footers are spaced 4-8 feet apart but this can vary depending on the size of your deck and strength of the footers, so do your homework. How to Calculate the Framing Size for a Deck. Just don’t be misled by the bit’s size. Your best bet would be the 1/4″. x 12 ft. Hem-Fir Brown Stain Ground Contact Pressure-Treated Lumber (Actual: 1.5 in. For example, an elevated deck that is designed to support the weight of many people would have a different span than a small, first floor room. After selecting a straight piece of lumber for the ledger board, the ledger is bolted to the house's framing. Star Flat-Head Wood Deck Screw ($26.94 for a 5 lb. An untreated 2x10 will measure 9-1/4 inches, a PT 2x10 may only be 9-1/8 inches wide. admin says: Hi Stuart, thank you for getting in touch with us! Deck boards need to have corrosion resistant screws because they are constantly exposed to the elements. 2 and better are the best choices for deck building. 1. 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 … Joist Size for Hot Tub Deck. Choosing the right type of fastener is only part of the process; you'll also need to figure out the size and variation of fastener. Now your Chihuahua just fell through the gap between the deck boards! However, blocking can provide both rigidity and stability to a frame and, depending on the size of the joists, may even be required by code. x 5-1/2 in. x 144 in.) There is bracing every 24" or so. A wooden deck is really nothing more than an outdoor floor. The 1-1/2 in. A 12 -by-12-foot deck will need 144 lineal feet of decking. This will help you visualize the deck’s support system once constructed. For centuries, decks have been constructed using traditional lumber with little regard for proper deck board spacing. I let them float, and expand/contract as they need. Most decking screws are 8-gauge and, while 2 1/2 inches is the minimum length needed to hold decking boards to the joists, 3-inch screws are commonly used to provide extra holding power against the upward pressure of shrinking or warping boards. Needs to be lumber 2 X 6 or 2 x 8 or 2 x 10. What do you think. Leave Gap: If the pressure treated wood has been kiln dried after treatment (KDAT), leave a 1/8” gap (the thickness of an 8-penny nail) between the boards when attaching, since the wood will expand slightly over time. The best practice, suggested by the 2012 IRC (Figure R507.2.3), is to use hold-down tension hardware in at least two locations to tie deck joists to floor joists of the primary structure. In general, ledger boards are the same size as the floor joists. If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. Thank you for your help. The post size is determined by the load area and deck height. x 5-1/2 in. For installing standard 5/4-inch decking boards, you can’t go wrong with Deck Mate’s ACQ-compatible, polymer coated #10 x 3-1/2 in. When securing the decking, it is important to leave adequate spacing between the boards for water to drain. As is normal for this type of deck, softwood timbers were used in the frame joist, bearers and of course the actual finishings with deck boards and balustrade surrounds. The Best Fasteners for Deck Boards 305 or 316 Stainless Steel Deck Screws. Then use spacers at each joist to keep the gap between boards consistent and to keep the boards running straight. To build such a deck, you’ll need deck boards as well as inner and outer joists, the pieces of wood that go between the top boards and your grass/concrete. (Table 1:2 or Table 1:3) 3. Using the beam span table, select your beam lumber size. Our load area is 10 x 12 = 120 feet and according to the chart, we need 6-by-6 posts regardless of how high the deck is. If you're installing composite deck boards, we recommend color-matching yours with DuraSpin composite deck screws or BeckDeck Scrails. It … Sixteen-penny nails are about the right size for spacing between deck boards. x 5.5 in. A couple have warped pretty good, but it's a solid floor, and I suspect it'll last a good 10 years or more. The required joist size will probably be listed in the building code for your area. The floor joist span for decks also depends on the floor dimensions and type of material used to build the deck. This article covers why the material type and the fastener used need to be considered. Composite decking is about 1.5 to 3x the cost of wood, but with wood, you'll have higher maintenance costs (sanding & refinishing every year or so). Then using the lumber size of joists and the joist spacing, determine if you are within the maximum allowable joist span. But sight down your boards occasionally as well. Softwood timber is easier to work, and can still look good with very little difference from some of the hardwood deck boards. Fig. 2 in. Where it intersects with the deck joist span provides you with the maximum spacing between your posts. Mark off areas where you’ll likely need a footer and a deck post. The ledger defines the deck location, width at the building, and height from the ground. Whether to leave a gap between pressure treated wood deck boards depends on how dry the wood you’re using is. In this case, the beams are 10 feet apart (ledger to beam = 10 feet) and the distance between the posts is 12 feet. That widening gap will make any deck owner upset, but now let’s imagine the opposite scenario where the deck was installed with a 1/4″ gap in the dead of winter. If you don't have a mill around, then use the treated boards. The joists should measure as long as the length of your deck. Collated deck screws come in several different colors, coatings and materials. This bit does wonders for deck posts and beams. Building code requires the use of blocking for floor joists that exceed 2 inches in width by 12 inches in depth. Another very common deck is a raised deck with steps. So build your deck the right way, from the ground and posts up. Unlike interior floor joists, you also have to take into account the direction and size of your decking. Boards graded No. Raised Deck with Steps. 7 Creating a curved edge for a deck 2400 3040 Horizontal 2400 3040 Diagonal Bearer frame work Bearer frame work Deck boards Deck boards Deck edge timber secured in place, either into the deck board edge, prior to the other side deck boards being fixed, or through the top face Best way to start is by discussing the deck design with your local code enforcement official. Many homes are not built at ground level. by John Stuart (Calgary, AB) I'm struggling to find the appropriate materials for the lower portion of a 2 tier deck that will be supporting a hot tub. My front deck (480 sq) has 2x6 decking and the rear deck (300 sq) has 5/4 decking, both 16" on center. Besides, 1x6 are really 3/4" x 5-1/2" - too thin for most floor loads and easier to bend and warp and crack. With a long narrow deck for example, you can use short boards and run them across the width of the deck to give an illusion of reducing the length and increasing the width. Construction grade, common, and No. (Table 1:4) Deck Terminology How much to space deck floor boards: ... On 2017-01-22 by (mod) - Back deck floor 12 by 16 what gap size. Plus, unlike floor joists, decks needs to be able to support the extra weight of pressure treated wood, handrails, as well as snowfall during winter. Deck board spacing is crucial for the looks and health of a deck – it’s not one size fits all. If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. Stainless steel deck screws usually come in 305 stainless steel. I have been recommended that 3mm may be thick enough. 3 stock have defects that make them unsuitable for a deck. Straighten crooked boards with a chisel, clamp or nail Specialty decking materials have different requirements. The elevation of an area can also affect what kind of floor joist span is needed. Is blocking required for floor joists? Deck Design Router Bit#2: The 2 1/2″ dia. This is a must for deck screws. We would recommend the thinnest be 3/16″ or 1/4″. December 11, 2017 at 5:02 pm . Some boards will be smaller than standard nominal sizes. Reply. By summer time those boards have expanded by more than 1/4″. It lets you create classy, angled edges on all kinds of vertical supports, railing structures and veranda posts. Decking boards: Deck flooring can be made of natural wood, synthetics, or composite (a mixture of plastic and wood). It’s big, but perfectly proportioned for the large dimensions of deck construction. The size of the floor is 4ft x 6ft 5. Deck post size is important. The ledger forms the key reference point from which all other deck measurements and plans will be made. It will outlast the treated pine at the box stores. The lower deck structure is 10'x10' ledger to beam construction. x 12 ft. Pressure-Treated The 1-1/2 in. 1 boards are top-quality but are usually not worth the extra cost for use in deck building. 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