Awesome deck! 600 or 400 centers depending on the type of flooring/joist sizes. The distance your joists can safely cantilever or overhang a drop beam is determined by the size of the joists, the wood type and grade of the lumber and the spacing between joists. Where to Start Joist Layout. Girder depth shall be greater than or equal to depth of joists with a flush beam condition. Your maximum joist span will depend on the wood species, joist spacing, size and whether the joists will be cantilevered. Hammer the screws down a bit so they don't stick up. A little each day like you said patience. Building the deck Jake teamed up with Shannan at his place to build a low 2400 x 1500mm deck positioned in front of the water tank and adjacent to the paved area for barbecuing and entertaining. The deck is about 12 years old and some of the joists … They are much weaker than 2x6s so you will have to have a much tighter joist spacing, certainly no more than 12" from center to center. The deck planks are made to have a gap between them, so use a small nail as your spacing guide at each joint. So, for example, instead of 16" spacing with 6" joist, you may have to go to 12" spacing with a 4" joist. A 2x6 will span less than a 2x8 and so on. This chart is for southern yellow pine (SYP) framing lumber and similar strength woods. Use a drill and decking screws to attach joist hangers to the interior of your floating deck’s frame. That seems excessive. How did you attach your blocking? Some synthetic decking requires joist spacing at 12 in. I am calculating the need for 32 pier blocks for a 16x16 deck. After making my own deck measurements and plans for a 10 X 24 floating deck, I went for it and actually had Lowe’s deliver all the deck material to my house. spanning 16’-6” between supports may cantilever up to an additional 4’-1 … Be sure to check and confirm the deck joist spacing on your deck frame meets the necessary spacing and blocking. The table gives the maximum distance between joist supports which include beams and the ledger board. This topic has 50 replies, 19 voices, and was last updated 5 years, 7 months ago by EthanB. When you come to lay the decking it can be difficult to fix a sag or bulge so it’s important that you ensure all joists are at the correct height at this stage. And yes if you do choose to use 2x6s you would have to carefully set that deck block a bit lower into the soil to keep the deck surface level. But shouldn't that matter? For the deck shown here, we used standard 16-in.-o.c. Attach each joist hanger at 16-in. on center for strong support under foot. Guide to building low and ground-level decks. Where the deck plank meets each joist, screw two square-head trim screws 1-1/4 inch from each side of the deck plank (Image 1). Dimensions stated represent the maximum length of unsupported joists (ie. The Joist span table below is for joists with a continuous span on a deck below 1metre in height. Beam Cantilever = 5” @ 16” O/C 3 Ply 2x8 Beams on 6x6 post w/ deck Block Floor Joists – 2x6 Beam Clear Span between supports is 4’3” 10' 0' 15' 0' Stairs – 3 Risers @ 7.5”, Treads 10”, Nosing 1” Joist Span and Spacing Chart Max Deck Joist Spans for S.P.F. Look at the chart to the left and learn how to use it. If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. Your blocking looks to be in a straight line with no offset for screws or nails. In other words, when you put weight on the deck, the joist won't bend. Once you have your joist span, and pier spacing you can size each component of the deck using Tables 1 and 2 below. Joist Span. For instance, joists that are placed 24 inches apart must be wider than joists placed 16 inches apart. Make sure all your joists will be flush with your beams. 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