Essential Tips for Joist Spacing and Blocking in Composite Deck Installation

When building a composite deck, a strong foundation is key. Proper joist spacing and blocking are critical to creating a deck that is not only sturdy but also durable for years to come. In this video from Armadillo Composite Decking, you’ll discover the best practices for planning and installing your deck’s framework.

Standard Joist Spacing

For most traditional deck layouts with boards installed perpendicular to the joists, the standard spacing is 16 inches on center. This spacing provides adequate support for foot traffic, outdoor furniture, and daily use, keeping your deck safe and stable.

Herringbone Design Considerations

If your deck features a herringbone pattern, the joist spacing should be reduced to 12 inches on center. Boards installed at a 45-degree angle increase the effective span, so closer joists prevent flexing and sagging over time, ensuring a solid and level surface.

Blocking for Picture Frames

Picture frame borders add a stylish touch to your deck, but they require extra reinforcement. Installing blocking under the frame boards creates secure tie-in points, keeping the border level and tightly fastened. This step guarantees a polished, professional finish.

Blocking for Railings

Safety matters just as much as aesthetics. Any railing posts should be supported with additional blocking. Proper blocking reinforces the posts, keeping your railings strong, secure, and compliant with building codes.

Plan Ahead for a Stronger Deck

Taking the time to plan joist spacing and blocking during the framing stage will save you from costly repairs or adjustments later. With a solid foundation, your composite deck will not only look great but also stand the test of time.

For more installation guides, design ideas, and product resources, visit ArmadilloDeck.com