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Decking Joists
The deck joist size that you require will depend on your project size, we have multiple length options in stock and available for delivery from any of our branches. When planning your decking joist spacing, a good rule of thumb for timber decking is 450mm centres (or 400mm centres is using a chevron pattern), and 400mm centres for composite decking (or 300mm centres if using a chevron pattern).
Frequently Asked Questions
What size deck joists?
The deck joist size required depends on your project design. Our most popular sizes are 47x100mm, 47x125mm, and 47x150mm. These are available from every Howarth branch in lengths of 3m, 3.6m, 4.2m, and 4.78m. We also have availability of 5.4m and 6m at select branches
What size screws for decking joists?
Camo deck screws are perfect for fastening deck boards to joists. For the framing, structural wood screws will do a great job.
How far apart should deck joists be?
When designing how far apart your deck joists should be, a good timber decking spacing is 450mm centres (or 400mm centres is using a chevron pattern), and 400mm centres for composite decking (or 300mm centres if using a chevron pattern).
How many decking joists do I need?
The number of decking joists needed is dependant upon the size of the decking project. It can be calculated based on spacing of 450mm centres for timber decking (400mm centres for chevron pattern) and 400mm centres for composite decking (300mm centres for chevron pattern).
What wood to use for deck joists?
C16 or C24 timber is ideal for decking joists. It is structural graded and when well put together will keep the decking strong and stable.
How thick should decking joists be?
Decking joists are most commonly 47mm in size.
Should I stain deck joists?
We always recommend treating timber and maintaining it over time, this includes decking joists. This will increase the longevity of the decking structure. Don’t forget to protect the ends!
How to guides
How to build a deck
How to build a decking using our timber products.
How to build a raised deck
A step by step guide on how to build your own raised decking area.