How to Install Domi Composite Decking?

If you're considering upgrading your outdoor space with Composite Decking, you're making a smart choice. Composite decks offer durability, low maintenance, and a sleek modern look. But to maximize these benefits, proper installation is key. 

In this guide, we'll walk you through how to install composite decking like a pro—saving you time, money, and stress. Whether you're a DIY enthusiast or planning to hire a contractor, this article will help you understand the process and make informed decisions.

Why Choose Composite Decking?

Before diving into how to install composite decking, let's quickly recap why it's worth the investment:

Zero rot, splinters, or fading: Unlike wood, composite deck can resist weather damage.

Low maintenance: No annual staining or sealing required.

Eco-friendly: Most composite decking are made from recycled materials. No require staining, and come in a variety of colors and textures.

Composite decking has become a top choice for homeowners looking to upgrade their outdoor spaces. But even the best materials need proper installation to deliver long-term value.

Now, let's get to the installation!

Tools & Materials You'll Need

Gather these essentials before starting your composite Deck Installation:

Composite deck boards (calculate square footage + 10% extra for cuts)

Hidden fasteners or stainless-steel screws

Pressure-treated joists (for the frame)

Circular saw or miter saw

Drill, measuring tape, level, and chalk line

Concrete footings (if building a new frame)

Safety gear: gloves, goggles, and ear protection

Step 1: Prepare the Frame

A sturdy frame is the backbone of your deck. Here's how to set it up:

Lay the foundation: Use concrete footings to support posts and beams. Ensure the frame is level and slightly (1/4" per foot) away from your house for drainage.

Spacing of joists: For composite decking, joists should be 12–16 inches apart. Within a certain range, the smaller the spacing, the more dispersed the force on the floor, the less impact on the internal structure of the board, and the longer the service life.

Install joists properly: Make sure that the keels are installed in the same straight line, and use double joists at the floor joints to disperse the force and ensure the stability of the floor.

Step 2: Install Starter Clips

Composite boards expand and contract with temperature changes. To accommodate this:

Attach starter clips: Align first composite board with deck edge. Secure hidden starter clips to joists using provided screws.

Leave expansion gaps: Maintain a 1/4–1/2" gap between the decking and nearby walls or railings.

Step 3: Lay the Composite Deck Boards

Now for the main event: installing the composite decking.

Align the first board: Place it on the starter clips, ensuring it's straight.

Secure with hidden fasteners: Snap fasteners into the board's grooves and screw them into the joists. This creates a clean, screw-free surface.

Work row by row: Repeat the process, spacing boards 1/8–1/4" apart for airflow and expansion.

Step 4: Trim Edges

Cut boards as needed: Use a fine-tooth blade for clean cuts.

Install edge trim: Cover exposed board ends with composite trim for a polished look.

Step 5: Maintenance Tips

While composite decking is low-effort, a little care goes a long way:

Clean: Use soapy water and a soft brush.

Avoid harsh chemicals: They can damage the surface.

Regular Inspection: Clear leaves and dirt between boards to prevent moisture buildup.

Troubleshooting Common Issues

Problem: Board warping
Solution: Check for proper ventilation underneath

Problem: Surface scratches
Solution: Use heat gun to gently restore texture

Problem: Fading color
Solution: Apply UV-protective composite sealer

Why Professional Help Matters

Learning how to install composite decking is doable for DIYers, but complex designs or large decks might require expertise. Hiring a professional ensures:

Precise measurements and alignment

Compliance with local building codes

Warranty protection (some manufacturers require pro installation)

Ready to Start Your Project?

Now that you know how to install composite decking, it's time to bring your vision to life!

At Domi, we supply premium composite decking materials designed for easy installation and lasting beauty.

Need help?

Download our free installation checklist.

Watch step-by-step video tutorials on our website.

Contact our team for personalized advice or bulk quotes.

By following this guide, you'll not only save money but also enjoy a stunning outdoor space for years to come. Got questions? Reach out—we're here to help you succeed!