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How to Install Composite Decking (DIY Guide)

Transforming your outdoor space with a beautiful and low-maintenance composite deck is an exciting home improvement project. Whether you’re looking…
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Jacob Wadding

Transforming your outdoor space with a beautiful and low-maintenance composite deck is an exciting home improvement project. Whether you’re looking to expand your outdoor living area, add value to your home, or create a cozy spot for relaxation, installing composite decking can be a rewarding DIY endeavor. In this comprehensive guide, we’ll walk you through the steps to successfully install composite decking and create the backyard retreat of your dreams!

Inside this blog:

  • Why composite decking is a smart choice for homeowners
  • A 7-step guide for successful composite decking installation
  • Tips + tricks for DIY composite decking

Keep reading to become a DIY master at composite decking installation so you can boost your home’s curb appeal and scratch that DIY itch!

Why Choose Composite Decking? 🤔

Before we dive into the installation process, let’s briefly explore why composite decking is an excellent choice for your outdoor project:


Composite decking is designed to withstand the elements, including harsh weather, UV rays, and moisture, without rotting, warping, or splintering. This means your deck will look as good as new for years, even in challenging climates.

Low Maintenance

Unlike traditional wood decking, composite boards require minimal maintenance. No need for staining, sealing, or constant upkeep. Just occasional cleaning to keep your deck looking its best.


Composite decking has a long lifespan, often outlasting traditional wood decking, making it a cost-effective choice in the long run. You can enjoy your beautiful deck without worrying about premature replacement.



Composite decking comes in a wide range of colors and styles, allowing you to achieve the look you desire for your outdoor space. Whether you prefer a classic wood-grain appearance or a modern, sleek design, there’s a composite decking option to suit your aesthetic preferences. Your deck can be a true reflection of your style.

Now, let’s get started on the installation process.

Materials and Tools You’ll Need 🧰

Before you begin, gather the necessary materials and tools for your composite decking project. Here’s a list to help you get started:

  • Composite decking boards & deck screws
  • Joists or sleepers & end caps or trim pieces
  • Gravel or landscape fabric (for ground-level decks)
  • Post anchors & concrete or adjustable deck blocks (for elevated decks)
  • Post sleeves (for railing installation)
  • Drill/driver with screwdriver bits & a circular saw with a fine-toothed blade
  • Carpenter’s square, chalk line, & level
  • Safety glasses, ear protection, & work gloves
  • Spacing guides (or spare deck boards for spacing)
  • Rubber mallet & measuring tape

7-Step Guide to Install Composite Decking

Below we’ll cover the 7 essential steps to ensuring a successful DIY composite decking installation.

1. Plan Your Deck

  • Design: Decide on the size, shape, and layout of your deck. Consider any features like stairs, railings, or built-in benches.
  • Permits: Check with your local authorities if permits are required for your deck project.

2. Prepare the Site

  • Clear the Area: Remove grass, weeds, or any obstacles from the area where your deck will be built.
  • Level the Ground: Ensure the ground is level and compacted. You may need to use a tamper for this.

3. Install the Frame

  • Set the Joists: Place joists or sleepers on the ground or on top of deck blocks or concrete supports for elevated decks. Ensure they are spaced according to your composite decking manufacturer’s guidelines.
  • Use Joist Tape: Apply joist tape to the tops of the joists to prevent moisture penetration.

4. Create the Decking Substructure

  • Install Deck Boards: Begin installing your composite deck boards perpendicular to the joists. Leave a small gap between each board for expansion and drainage.
  • Secure the Boards: Use composite deck screws to secure the boards to the joists. Pre-drill holes for a clean and secure fit.
  • Check for Level: Use a level to ensure your deck boards are even and level as you progress.

5. Trim and Finish

  • Trim the Edges: If needed, trim the outer edges of your deck boards to achieve a clean, finished look.
  • Install End Caps: Apply end caps or trim pieces to cover the ends of your composite deck boards.

6. Railing Installation (Optional)

  • Install Posts: Attach post anchors to your deck surface, then slide post sleeves over them.
  • Attach Rails: Install railing components, following your manufacturer’s instructions. Be sure to check for plumb and level.

7. Final Inspection

  • Inspect and Enjoy: Give your deck a final inspection to ensure everything is secure and level. Now, it’s time to relax and enjoy your new outdoor space!

Tips for a Successful Composite Decking Installation 🔧

To ensure a smooth and successful installation, consider these tips:

Follow Manufacturer Guidelines

Always follow the installation instructions provided by your composite decking manufacturer. They may have specific recommendations for their products.

Allow for Expansion

Leave adequate gaps between boards to accommodate expansion and contraction due to temperature changes.

Use the Right Fasteners

Use composite deck screws designed for your specific decking material. Avoid using regular wood screws, as they may not provide the necessary grip.

Maintain Consistency

Maintain consistent spacing and alignment throughout the installation to achieve a polished look.

Safety First

Use appropriate safety gear when cutting composite boards, and follow safety guidelines for all tools.

Consider Hidden Fasteners

If you prefer a seamless deck surface, consider using hidden fasteners or deck clips for a clean finish.

Install Composite Decking Like a Pro 🏡

Installing composite decking is a rewarding DIY project that can enhance your outdoor living space for years to come. With durability, low maintenance, and a wide range of style options, composite decking is an excellent choice for homeowners looking to create a beautiful and functional outdoor retreat. By following the steps outlined in this guide and adhering to safety precautions, you can complete your composite decking project with confidence. So, gather your materials and tools, plan your design, and get ready to enjoy your newly transformed outdoor oasis! 

Contact Arch Exteriors today to get in touch with our expert team of contractors. With our top tier craftsmanship and dedicated customer service, we guarantee you’ll be thrilled with the final product. Let’s get started on your next home improvement project today!

About the Author
Your home is probably the most expensive thing you own. When you hire somebody to make improvements, you want high-quality work. In addition, you hope they’ll take the same care you would. You want someone with a good reputation, legitimate credentials, well established, using quality materials, and who charges a fair price. For over 11 years, I have worked hard to provide all of those benefits to my clients. One of the major reasons we have been able to do that is our ability to keep highly qualified personnel. Our workers are well trained, properly motivated, and managed professionally. I make certain that I convey measurable systems and procedures that our team understands and can readily follow.

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