How Far Apart Should You Place Your Joists?

Composite decking has become the leading decking solution for homeowners. Aside from the many benefits over wood, composite materials are easy to install. You don’t need to cut, treat, or sand the materials. Instead, you can immediately start working with them. Most consumers install composite decking on wooden joists, when doing this the joist spacing is crucial to reduce sagging or warping during the deck life span.

However, here’s what is confusing for many people: how close should joists be when using composite materials?

A strong foundation is the first step to a well-built decking. To ensure long-lasting composite decking, the precise placing of the deck joists is crucial. If you want to install decking in your outdoor space, you should place the joists accurately. This article will shed light on joist spacing for composite decking. It will also discuss how far apart you should place your joists.

Additionally, joist spacing also depends on the angle and length of your decking. Some brands recommend 40cm (400mm) at the centre for 90 degree angles. And also, 20cm (200mm) on the centre for 30-degree angles and 20cm (200mm) for 45-degree angles.

For residential decking, the joist space should not exceed 30cm (300mm), as measured in the centre. But if you want a more rigid feel for your decking, you can space the joists 20cm (200cm) in the centre. Please note: Lower joists centres will require additional accessories. Additionally, for commercial decking, the standard joist spacing is 20cm (200mm) in the centre using either a circular hollow or solid core composite decking board to compensate for the additional footfall and weight. Some areas in the UK have building regulations for deck joist spacing. You should always check for the recommended joist building regulations if required with your local authority to know exactly the appropriate joist spacing for composite decking and how the joists should be correctly installed?

Blocking involves installing small pieces of wood between the joists. It increases rigidity, and it also prevents sagging or twisting of the joist.

Lastly, you should cross-check your work. Check for protruding nails and screws. Take your time to inspect the joist can add to the lifespan of your decking. Always check your work to ensure the joists are properly placed.

Conclusion

Always follow the manufacturer’s guidelines. Depending on the brand and type of composite decking purchased the manufacturers guidelines for joist spacing can vary from product to product.