Thistype of measurementis known as on-center-spacing.
For instance, metal joists can typically span several more feet than a standard wooden joist.
Use this guide to learn how to calculate deck joist spacing.
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Prepare the Deck Plan
Draw out a deck plan to follow.
The size, shape, and layout for the deck boards will determine the joist span and spacing.
Standard rectangular decks with boards running perpendicular to the joists are the most straightforward option.
These decks typically require deck joist spacing of about 16 inches on center.
Just keep in mind that the more elaborate the decking plan, the greater the joist structure requirements.
Pressure treated lumberis one of the most commonly used products.
It’s available in a range of sizes, including 2x6, 2x8, 2x10, and 2x12.
Calculating the deck joist span is significantly more difficult and requires the use of several different formulas.
It’s recommended to use a joist spancalculatoror to refer to a joist sizing and span table.
Joist Size
The size of the joist will also impact the joist span and spacing.
Generally, the wider the joist, the more weight it will be able to hold.
This is the amount of weight the deck needs to hold without bending, breaking, or collapsing.
Heavy items, like hot tubs, may require additional joists and support beams.
You should also inspect the existing screws, nails, and brackets for signs of corrosion.
Replace any fasteners that look suspect.
you could run a string across thedeck frameduring the construction process to ensure the joists are level.
For instance, you should limit the joist spacing to just 12 inches for diagonal inlays.
Deck joist spacing and span chart.
