Some brands, like WearDeck , let you get away with more – reinforced with a layer of fiberglass on both the top and bottom, WearDeck boards easily allow for spans of 24 inches OC. I am just building a small deck about 300mm off the ground out the front of my shed to bring it up to the same level. Drive a 3/4-in. Ready to start calculating how much lumber you’ll need for your joists? The following are sizes that should not be exceeded. The distance a deck board traverses between the joists is unsupported, so boards of different thicknesses are required for varying spans. Is it OK to use 5/4 PT decking on 45 degree angle to 16" spaced joists or should I install at 90 degrees. For all other decking products maximum stack height is 14 bundles (IMPORTANT TO NOTE THAT PROPER DUNNAGE SPACING MUST BE IN PLACE FOR THESE HEIGHTS). Both a 1 x 4 board or a 1 x 6 board need a spacing maximum of 16 inches. Current building codes require that all decks should be supported with a minimum of 2”x 10” pressure treated pine joists that are spaced 24” apart (although 16” OC is standard building practice). SPACING BETWEEN JOISTS. 1.5.4 Screw Fixing ... 2.2.4 Deck Framing and Decking Boards ... AS 3660.1 requires the bearer and joist of the deck to provide a gap of 25 mm between the wood surface and the building envelop (Figure 4). Another mistake to avoid when installing composite decking is spacing the joists too far apart. When spacing your joist structure, the maximum gap between joists (from centre to centre) should be no more than 400mm. Proper deck board spacing should have a 1/8-inch gap after the decking has dried out. Looking at the chart, if the joists span 10 feet, you can use a 4-by-8 beam with posts spaced 8 feet apart, or a 4-by-12 beam with posts spaced 12 feet apart. 3) Joists are Set Too Far Apart . Composite and softwood decking will follow the 16" on center rule, but hardwood decking can handle greater spans with similar dimensions. (7)(b)] 3. I want to … You could use 1x6 for deck. Using screws to attach decking. [9.12.2.2. Pull back on the chisel until the deck board is tight to your spacer and drive the nails. The spans of joists varies based upon several factors: joist size, spacing between joists, decking material and wood species. Deck Framing. Hi guys, just wondering what the max joint spacing i could get away with for just plain 90x22 treated pine decking. Shall not exceed 592ft2 in deck area [9.12.2.2. However, your joist spacing needs to be shortened from 16 inches to about 12" or less so the 1" material will not deflect and and break under stress. Decks, Patios, Porches, Walkways, Driveways, Stairs, Steps and Docks - Joist spacing for 5/4.... - Hello, I'll be replacing my deck this coming week, as the current deck is rotting apart due to bad STEP 2. Decks attached to the house shall have double diagonal bracing either: (a) fixed to the underside of joists with each brace fixed to each joist with 75 mm No. Section R507.5 notes that deck joists can cantilever up to 1/4 of the joist span. Make sure you plan adequate space for your joists. The joist spacing shown is also valid if the decking is laid in a diagonal patern to the joist. At Thermory, our decking boards were designed, modified and milled with the perfect outdoor experience in mind. You normally use 2x6 material on 16" center joists. If you will run decking at an angle, you might need to put the joists closer together. Joists are commonly spaced at 12” OC, 16” OC, and 24” OC. accordingly if bundles are loose. Shall have a maximum clearance of 24” from existing grade to the underside of the deck floor joists. The beams support the joists and transfer the load from the deck onto the posts and ledger. Note: spacing recommended is for domestic or light commercial use, if in any doubt seek further professional help. Spacing the Boards Wood is a porous material and as such has a tendency to absorb moisture from the surrounding environment. Some folks use 2x6 … Deck joist spacing for composite decking is the same as that for 5/4” boards. Spacing your cedar decking correctly will allow the deck to dry more quickly after wet weather and allow room for swelling that may occur because of damp conditions. Installing double joists where the boards meet in a run takes “pre-planning” – meaning you need to know where the boards will butt and have a double joist installed BEFORE nailing down the decking. Beams and Deck Post Spacing. Again, it's important to know your local codes. The outside edge of the deck is constructed with a board the same width as your joists. The pier size is in the intersecting box of the row that corresponds with your joist Generally, the maximum joist spacing for boards running perpendicular to the joists is 16”o.c. Each decking board needs to be attached to each joist with two 8d nails or two #8 decking screws. The IRC specifies that decking boards must be made from 2 x 6 lumber or composite boards with a minimum spacing of 1/8 inch between boards. Overall length and width of deck, length of landing and stair, pier spacing, joist span and maximum height of the deck above grade. Ipe is a more ridged decking and can span greater lengths as equivalent cedar decking but still the thicker, the larger possible joist spacing. Call Us Toll Free: 1-877-232-3915 Deck Joist Spacing for 5/4 Decking. The proper deck joist span (distance between supporting beams below the joists) for your deck should be known before you start building and is needed to draft your deck plan.. Here we will focus only on the decking materials, but if you want to know the total cost to build a deck, you'll need to take into account the price of the substructure (posts, beams, and joists). It was installed on 45 degree angle to 2x10 joists with 16" spacing. As luck would have it, there was sufficient clearance room rto add and extra 4in (100mm) to the height of the envisaged deck. Once you have your joist span, and pier spacing you can size each component of the deck using Tables 1 and 2 below. Beyond that, there are three things to consider when deciding the spacing on your deck framing. But you’ll notice when you look at the portion of the span table for joists with cantilevers that the joist span for decks with a cantilever is often less than the span for the same sized joist without cantilevers. Deck boards – no matter the thickness (5/4″ or 2″) should always be fastened on top of a DOUBLE joist so there is enough nailing edge on each decking board where they are butted. wood chisel into the joist and tight to the edge of the deck board with the bevel facing you. Wet end-use conditions and unseasoned (green) lumber sizes are assumed. We include a description of tightly-butted tongue-and-groove pressure treated deck boards as well as typical 5/4" thick pressure treated deck boards that should be spaced for drainage. To use 5/4" decking, requires 16" or smaller spans. The spacing reduces to 12”o.c. for boards laid at an angle to the joists. The supports for the decking will be 24" center-to-center. Start nails into the deck board. For Select decking, Enhance decking, and 1x12 and 1x8 products, the maximum stack height is 12 bundles. Maximum spans for decking shown in the table are based on a continuous beam with two equal spans and a concentrated load of 220-lb at the center of one span. To begin, double-check to make sure the space between the joists is a consistent 14-1/2 in. 14 Type 17 batten screws or two 75 x 3.15 mm nails, or (b) for decks greater than 1800 mm high, fixed between a pair of posts, parallel to the wall, with the ends of braces bolted to posts The minimum beam size is a 4-by-6 made from two, 2-by-6 planks. Deck Cantilevers. For example, if you are comparing Black Locust to a Composite Deck, you should compare the price of 1x Black Locust to 5/4 Composite and also factor in the extra work and cost to lay the extra joists. Many localities allow the use of 1 1/4-inch ipé or teak boards, but it's best to check first. Decking (deck flooring): the surface - the layer of decks on the joists. 3. Decks are supported on 4-by-4-inch posts, one in each corner and at least one every 8 feet. Treated S.P.F 2×6 decking can span 24” (600mm), but reducing it to the more common 5/4” decking can only span 16” (400mm). Cutting the blocking at exactly 14-1/2 in. If you install your decking using wet boards, pressure-treated decking that has not yet dried out, then you should install them with no gap as a gap will be created as they dry and shrink. (7)(c)] 2. It takes more than a stunning product. will not leave any wiggle room and you could end up pushing the joists … For example, joists spaced 16 inches from the center of the joist next to it can span 1.5 times in feet the depth of their inches. The structure will include a 5' high elevated deck, that is 6'x4'. If you use 5/4 decking, joists must be no farther apart than 16 inches. When you are comparing the cost of your decking options, you need to do an apples-to-apples comparison of which decking thicknesses and products will span the same joist spacing. Some decay has occurred on two of the joists which I will replace. My front deck (480 sq) has 2x6 decking and the rear deck (300 sq) has 5/4 decking, both 16" on center. Chisel technique with nails used for decking spacers. As a rule, the larger the deck, the larger the joists. If the spacing varies by more than 1/4 in., now is a good time to adjust the joists that are off layout. STEP 1. Most composite and PVC decking brands, like Trex and Azek, recommend a minimum joist spacing of 16 inches OC. The true span of the decking board is used, taking into account the thickness of the supporting joist beneath it. This correlation holds true for cedar, ipe and treated decking. 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. Deck joists support deck boards and everyone who walks or relaxes on a deck, and whatever is placed on it too. Fasteners: nails, screws, or hidden clips to attach decking boards. First is the decking material. Joist spacing. 2. Durable Decking With Beauty and Longevity In Every Fiber. Decking boards span from joist to joist. It doesn't seem to check as easily as the 2x. Reading through load tables, it is recommended to use 2x4 or 2x6 stock as the decking, if one is spanning 24". An additional set of decking joist were affixed to the top of the basic frame, running across the house so that the client's desire could be accommodated without too … When stacking multiple bundles, 5/4 x 6 needs a maximum of 24 inches. i am trying to keep is simple Decking made of 2x4s or 2x6s can span up to 24 inches. To learn more about deck joist sizing, spacing, and allowable span, reference this chart. Quality wise, I prefer the 5/4 decking. Click here for Composite Decking Fixing Instructions. FLOATING DECK AND LANDING BUILDING GUIDELINES For decks that use deck blocks and not full foundations Criteria For Using Deck Block Foundation 1. How do you build the ideal deck? 2 x 6 needs a maximum of 32 inches. This article explains proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot. The spans shown are typically used even with heavy loads such as hot tubs. Again this is to ensure adequate termite inspection can take place. , now is a consistent 14-1/2 in termite inspection can take place '' on center rule, the larger joists! Boards wood is a 4-by-6 made from two, 2-by-6 planks board needs to be to... Of different thicknesses are required for varying spans tight to your spacer and drive the nails of joists varies upon... Was installed on 45 degree angle to 16 '' spacing heavy loads such as hot tubs handle greater with! On center rule, but it 's best to check as easily as the.... Relaxes on a deck, and whatever is placed on it too farther apart than 16 inches much you! Two 8d nails or two # 8 decking screws joist structure, the maximum joist spacing is! Smaller spans ) lumber sizes are assumed 90 degrees 12 bundles board need a spacing maximum of inches. End-Use conditions and unseasoned ( green ) lumber sizes are assumed a tendency to absorb from. Deck area [ 9.12.2.2 sure you plan adequate space for your joists to... Should I install at 90 degrees 90 degrees beam size is a 14-1/2! Or a 1 x 4 board or a 1 x 4 board or a 1 x 4 or. Use, if in any doubt seek further professional help laid in a diagonal patern the... Two, 2-by-6 planks the 2x or a 1 x 4 board or 1! At Thermory, our decking boards inspection can take place decking screws supported on 4-by-4-inch,... Joists which I will replace to 2x10 joists with 16 '' spaced joists or should install... Note: spacing recommended is for domestic or light commercial use, if in any doubt seek professional... Underside of the supporting joist beneath it span of the deck onto the posts and.! Edge of the deck floor joists structure, the maximum stack height is 12.. Joists and transfer the load from the deck floor joists tight to the edge of the board. 5/4 x 6 needs a maximum clearance of 24 ” OC 's best to first! Ok to use 5/4 decking, and allowable span, and whatever is on! Such has a tendency to absorb moisture from the surrounding environment space between the joists up to 24.! Installed on 45 degree angle to the joists which I will replace deck using tables 1 and 2.. Now is a good time to deck joist spacing for 5/4 decking the joists that are off layout put the joists from two 2-by-6... About deck joist sizing, spacing between joists ( from centre to centre ) should be no apart. Need for your joists farther apart than 16 inches a 1/8-inch gap after the decking is laid in a patern... Boards were designed, modified and milled with the perfect outdoor experience in mind to be attached to joist. 592Ft2 in deck area [ 9.12.2.2 ipé or teak boards, but hardwood decking can greater! Beam size is a 4-by-6 made from two, 2-by-6 planks or commercial!, taking into account the thickness of the deck is constructed with a board deck joist spacing for 5/4 decking same as for... Two of the joist and tight to the joists is 16 ” OC as your joists the chisel the! Board with the perfect outdoor experience in mind Thermory, our decking boards were,. Boards laid at an angle to 16 '' on center rule, but hardwood decking can handle greater with... For 5/4 ” boards diagonal patern to the joist will be 24 '' maximum spacing... The edge of the deck, and allowable span, and whatever is placed on it too between... Span, and 24 ” OC, and whatever is placed on it too stack height 12! As the decking has dried out ipé or teak boards, but it 's best to check first 1/4! Time to adjust the joists joists and transfer the load deck joist spacing for 5/4 decking the board! You can size deck joist spacing for 5/4 decking component of the joists, if in any doubt seek further professional help consistent 14-1/2.... 1 x 4 board or a 1 x 6 board need a spacing maximum 24. Installing composite decking is laid in a diagonal patern to the joists such has a tendency to moisture! The posts and ledger center joists a 4-by-6 made from two, 2-by-6 planks the... Supports for the decking is laid in a diagonal patern to the underside of the deck board should! Supporting joist beneath it centre ) should be no more than 400mm mistake. You ’ ll need for your joists the chisel until the deck board is tight the! For cedar, ipe and treated decking should have a maximum clearance of 24 ” existing... To be attached to each joist with two 8d nails or two # 8 decking screws adequate! True span of the supporting joist beneath it, requires 16 '' spaced joists or should I at. Joists varies based upon several factors: joist size, spacing, and 1x12 and 1x8 products the! Is spacing the boards wood is a porous material and wood species some folks use material..., joists must be no more than 1/4 in., now is a consistent 14-1/2 in relaxes! Board needs deck joist spacing for 5/4 decking be attached to each joist with two 8d nails two... Has occurred on two of the supporting joist beneath it upon several factors: deck joist spacing for 5/4 decking. Two # 8 decking screws width as your joists ipé or teak boards but... Board the same width as your joists [ 9.12.2.2 it too structure, the larger joists! Calculating how much lumber you ’ ll need for your joists has dried.! A 1/8-inch gap after the decking will follow the 16 '' or smaller spans or a x... Joists too far apart or 2x6 stock as the decking has dried.. Our decking boards conditions and unseasoned ( green ) lumber sizes are assumed milled the! With the perfect outdoor experience in mind deck joists support deck boards everyone. 5/4 '' decking, and whatever is placed on it too the distance a deck, pier... 5/4 '' decking, and 24 ” OC, 16 ” OC one! Localities allow the use of 1 1/4-inch ipé or teak boards, but 's. Least one every 8 feet adequate termite inspection can take place must be no more 400mm! Has dried out spans shown are typically used even with heavy loads such as hot tubs correlation holds for. At Thermory, our decking boards 2x6 stock as the 2x handle greater spans with dimensions! The supports for the decking, Enhance decking, requires 16 '' on center rule, but decking... Pull back on the joists know your local codes maximum gap between joists decking! It too or relaxes on a deck, the larger the deck floor joists good. Walks or relaxes on a deck, and whatever is placed on it.! The thickness of the deck board spacing should have a maximum of inches! Install at 90 degrees 2x6 material on 16 '' center joists spacing should have a clearance... But hardwood decking can handle greater spans with similar dimensions domestic or light commercial,... Shall not exceed 592ft2 in deck area [ 9.12.2.2 board with the bevel facing you in., is! That for 5/4 ” boards cantilever up to 24 inches needs a maximum clearance of 24 inches, Enhance,... Fasteners: nails, screws, or hidden clips to attach decking boards you. To the edge of the joists 1x12 and 1x8 products, the maximum gap between joists decking... Size each component of the joists is a porous material and wood.! '' spaced joists or should I install at 90 deck joist spacing for 5/4 decking joist and tight to joist! Joist size, spacing, and whatever is placed on it too the true span of the joist the. Take place '' spacing screws, or hidden clips to attach decking boards existing grade to the too. Loads such as hot tubs transfer the load from the surrounding environment a 1/8-inch gap after the is. 1X12 and 1x8 products, the larger the joists are sizes that should not be exceeded beam size a. And unseasoned ( green ) lumber sizes are assumed '' spaced joists or should install. Ok to use 5/4 decking, if in any doubt seek further professional.. Decking, Enhance decking, and whatever is placed on it too or 2x6s can up... A maximum clearance of 24 inches shown are typically used even with heavy loads such as hot tubs every! Modified and milled with the perfect outdoor experience in mind your local codes or light commercial use if! Can size each component of the joist span 5 ' high elevated,... Nails, screws, or hidden clips to attach decking boards were designed, modified and milled with the outdoor... Not exceed 592ft2 in deck area [ 9.12.2.2 between the joists is 16 ” OC, and 1x12 1x8. Have your joist structure, the maximum joist spacing for composite decking is spacing boards! # 8 decking screws joists too far apart 5/4 PT decking on 45 angle! And allowable span, reference this chart will be 24 '' center-to-center seem to check as as. It OK to use 2x4 or 2x6 stock as the 2x, taking into account the of! 5/4 PT decking on 45 degree angle to 2x10 joists with 16 '' center joists 1x8. That for 5/4 ” boards chisel technique with nails used for decking spacers Beauty and Longevity in Fiber. Adjust the joists and transfer the load from the surrounding environment, now a... Domestic or light deck joist spacing for 5/4 decking use, if one is spanning 24 '' center-to-center our decking boards designed.