16 inches
The majority of composite deck board brands including Trex, TimberTech, and more require deck joists spacing to be at 16 inches O.C. (on center) for standard straight composite decking installation.

What is the best base for composite decking?

However, you will need a good base for the composite decking. Many use concrete flooring and concrete slabs for an even and stable base. Some also use adjustable pedestals. Using pressure-treated wood or composites will make a strong and durable frame.

Does composite decking need spacing?

As temperatures fluctuate, composite deck boards will naturally experience thermal expansion and contraction. That’s why the board ends should never be installed tight against one another. There should always be a slight gap.

Do you need a special saw blade to cut composite decking?

Cutting composite decking is similar to cutting normal lumber; it just requires special saw blades. So when cutting composite decking, it is advisable to use saw blades that are convenient and flexible for cutting. The saw blades must also be sharp.

Where are you recommended to start the deck boards when installing composite decking?

The first board you install, the starter board is the most important one. Depending on the shape of the deck, the first board can start at the house or at the outer rim joist. Use starter clips to fasten your first board or surface screws and plug the holes.

Where do you start when installing deck boards?

In most cases, it’s best to start with a full board on the outside edge of the deck and work toward the house so the odd board is less visible. Then measure when you’re 4 to 5 ft. away from the house and adjust the gap sizes to be sure the last board is a consistent width.

Do you need concrete base for composite decking?

Composite decking is like other building structures, and it needs to be properly installed. You need a solid foundation for your composite decking. A strong decking foundation will make the structure safe to use for outdoor activities. Also, a composite decking that has a strong foundation will last longer.

Can you but composite decking together?

Yes, additional framing is required for staggering decking. Composite decking needs the full 1 ½” (38mm) of framing to support the ends. If you stagger the joints, an additional block will need to be added to the joist to support the decking.

How many teeth do I need to cut composite decking?

40 tooth
What is the Best Saw Blade for Cutting Composite Decking? The EnviroBuild installation guide advises the use of a circular saw using a 40 tooth alternate top bevel finish blade to cut your composite decking boards.

Do you need to seal composite decking?

Once you have cleaned your deck, you can use a water-based sealer to seal your composite decking. It is advised to use products with synthetic resins to avoid mildew growth. You can also use a percarbonate wood cleaner. To maintain a clean aspect, you should brush your sealer while it is wet.

Can you install composite decking over wood decking?

When decks are exposed to extreme sunlight or abundant rainfall, the decking boards can wear out long before the deck’s foundation. You will have no problem installing composite decking boards on the deck, as most composite decks have wood foundations.

What is the suggested joist spacing for composite decking?

Before building a composite deck always read the installation instructions from the manufacturer paying special attention to the required joist spacing. Most composite decking materials require 16″ on center spacing for straight decking and 12″ on center joist spacing for 45 degree angle diagonal decking.

Can composite edging be used for decks?

Without the correct composite decking edging, even the most well designed decking projects can feel incomplete. Choose from NeoTimber’s selection of composite edge boards and composite decking edge trims to achieve an excellent finish to your composite decking area, framing-up your project perfectly.