What is the Proper Deck Post Spacing. The maximum joist spans below are based on a ground snow and live load of 40 pounds per square foot and a dead load of 10 pounds per square foot.
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Before building a composite deck always read the installation instructions from the manufacturer paying special attention to the required joist spacing for composite decking.
Deck joist spacing chart. A 26 joist can span up to 9 feet a 28 can span up to 12 feet and a 210 can span up to 15 feet. Please note that when deck joists are cantilevered. To properly space deck beams you need to consider the joist span.
The spacing depends on the thickness of decking used. Until a few years ago the IRC didnt have deck joist span tables. The deck joist span chart below is based on the updated codes from the International Residential Code 2015 which for the first time specifically addressed these deck design considerations.
JOIST SELECTION CHART Joist Size Maximum joist span between bearers at specified joist spacing 450mm 600mm 90 x 45mm 115M 100M 140 x 45mm 185M 160M 190 x 45mm 250M 215M 240 x 45mm 315M 270M 290 x 45mm 380M. Maximum Joist Spacing for Decks Southern Pine Deck Joist Maximum Spans Joists may cantilever up to ¼ of the actual adjacent span. Where decks are built close to the ground a considerable moisture.
As a rule the larger the deck the larger the joists. For sizes of bearers joists and allowable joist spacings refer to Tables 1 – 3. Tongue and Groove flooring should not be used in weather exposed situations.
Decking Stress Grade Thickness mm Maximum joist spacing mm Hardwood Standard Grade AS 27961 19 500 Cypress Grade 1 AS 1810 19 400 21 450 Treated Soft wood Standard grade AS 47851 19 400 22 450 Source. Proper deck post spacing follows the deck post spacing chart that is found within your local building code. Pine 2x Lumber 17 13 10 8 7 6 5 EW Rim 18 13 10 9 7 6 6 Hem Fir.
With most deck joist spaced at 16 400mm. 6 or Less Up to 8 Up to 10 Up to 12 Up to 14 Up to 16 Up to 18 40 psf Doug. Refer to Figure 4.
The distance between two deck joists is measured in inches on center commonly abbreviated as OC. Deck joists are typically spaced either every 12 inches or 16 inches on center. The most confusing part about understanding how far apart to space your joists is understanding the chart that explains it.
Pine 2x Lumber 24 18 14 12 10 9 8 EW Rim 25 19 15 12 10 9 8 Hem Fir 2x Lumber 20 15 12 10 8 7 6 EW Rim 25 19 15 12 10 9 8 60 psf Doug. Use the Beam and footing sizes table and find the 8 post spacing column. Use 66 deck support posts and an 8 or 10 wide 3-ply beam.
To learn more about deck joist sizing spacing and allowable span reference this chart. When determining the correct deck joist spacing its often a good idea to start with 16 400mm spacing. Ready to start calculating how much lumber youll need for your joists.
Required deck joist strength for the span Rule of thumb non-incised SprucePineFir joist can span its nominal depth times one and a half at 16 on centre. Spanning 16-6 between supports may cantilever up to an additional 4-1 ½ for a total maximum length of 20 -7 ½ Southern Pine Deck Beam Maximum Spans. Joists spaced the standard 16 inches apart can span 15 times their depth in feet.
A 28 joist can span 81512. Joist Size 200 mm Joist Spacing 300 mm Joist Spacing 400 mm Joist Spacing 600 mm Joist Spacing Cantilever mm DF -L H FS P Nor mm3 38 x 892 230 219 198 201 191 173 182 174 157 151 158 152 132 200 38 x 1402 361 344 311 305 316. The three most common deck joist spacing are 12 300mm 16 400mm and 24 600mm.
To make it simple place your posts no further than 8 apart. Spacing between fasteners in inches based on Joist Spans of. The table includes spans for common lumber species used for deck framing like.
With a 12 deck span the beam may be either two 2x8s or two 2x10s depending on the wood used. But the 2015 IRC included a new one Table R5075 that will make it easy for deck builders to spec a joist size for a given span and joist spacing. Joist Spacing for Composite Decking.
The maximum joist spacing you can use will depend on the size and allowable span of your joists. For example joists spaced 16 inches from the center of the joist next to it can span 15 times in feet the depth of their inches. Whats the maximum deck joist span.
For example a 2 x 12 joist placed 16 OC. Post spacing 8 Use the joist span table to find the acceptable joist sizes for a 12 span 2x8s at 12 OC 2x10s at 16 OC or 2x12s at 24 OC. Other grades and sizes can be used in accordance with AS1684 – Residential Timber Framed Construction.
The joists should be spaced at maximum centres according to the table below. If you were to draw a line down the center of two joists and then measure the distance between them as 16 inches that measurement is 16 inches on center. Deck joists have a different maximum span length depending upon the size spacing and framing material that youre creating your deck with.
The limitations of how far a joist can span determines just how many beams youll need. The joist span between support. Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted.
A 26 joist can span roughly 9 at 16 on centre. AS1684 Decking boards must be supported over at least three joists and butt joints in boards should be staggered. Most composite decking materials like Trex composite decking require minimum joist spacing for composite decking at 16 on center spacing for straight decking and 12 on center joist spacing for 45-degree angle diagonal decking.
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