Decking Joist Spacing

What Is The Proper Joist Spacing For Composite Decking?

I am looking to build a deck and I’ve been eyeing some composite options.So, as my title states, is the joist spacing for composite 16″ like wood decks? I also want this to be pretty sturdy because my in-laws will probably be on the deck often and they are pretty heavy set. Thanks!

Decking Joist Spacing Size – Experiencer’S Answer And Advice

Depends on the quality and thickness off the composite decking and amount of direct sunlight.

I believe 12″ is recommended for composite. Deflection/serviceability is the limiting factor here, not strength.

Used to be 24″, now it’s 16″, if there are still concerns at 16″, 12″ is a commonly accepted solution. You can buy thicker decking but it’s expensive, you can support the joists better but it will cost you a little bit, or you can add joists, which are cheap. I would go with 16″ and double up every 4 feet or so as long as you aren’t making the joists reach too far in the first place .

Depends on the length of span + size of joists. What size deck are you building, and what are you using for joists?

You didn’t mention if you were installing deck perpendicular to the joists, or at an angle. If you go at an angle, then you must reduce the joist spacing.

The bigger you make your deck, the more you ask of the framing timbers that hold up the deck’s structure, and the joists and beams that support the deck’s floor can only span so far before the whole deck becomes a safety hazard. The dimensions of the framing, the type of wood the framing is made from, the design of the deck and the weight load on the structure determine the maximum decking joist spacing, and understanding how these factors work together will help you to build a safe and secure deck.