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How Install Trex Decking How Install Trex Decking

Outdoor Furniture

How Install Trex Decking

Written by: Grace Wilson

Looking to enhance your outdoor space? Learn how to properly install Trex decking and create the perfect foundation for your outdoor furniture.

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Welcome to our comprehensive guide on how to install Trex decking! If you’re looking to enhance your outdoor space with a durable and low-maintenance decking solution, Trex is the perfect choice. With its high-quality composite material, Trex decking offers the look and feel of real wood without the need for constant upkeep.

In this article, we’ll walk you through the step-by-step process of installing Trex decking, from preparing the area to securing the boards. Whether you’re a seasoned DIY enthusiast or a homeowner looking to tackle a new project, we’ve got you covered.

Before we dive into the installation process, let’s talk about the tools and materials you’ll need to complete the job. Having these on hand will ensure a smooth and efficient installation.

Key Takeaways:

  • Installing Trex decking involves preparing the area, installing the frame, and securing the decking boards. It’s a durable and low-maintenance option that enhances outdoor spaces with the look and feel of real wood.
  • After installing Trex decking, adding finishing touches like trim, fascia boards, railings, and lighting completes the look. Regular maintenance ensures the deck remains a beautiful and functional outdoor space for years to come.

Tools and Materials Needed

Before you begin installing your Trex decking, gather the following tools and materials:


  • Measuring tape
  • Chalk line
  • Level
  • Circular saw
  • Miter saw
  • Drill
  • Screwdriver
  • Decking clips
  • Hammer
  • Concrete mix (if installing on a concrete surface)


  • Trex decking boards
  • Pressure-treated lumber (for the frame)
  • Deck screws
  • Joist hangers
  • Post anchors (if installing on posts)
  • Gravel or crushed stone (for the foundation)
  • Concrete (if installing on a concrete surface)
  • Protective gloves
  • Safety goggles

Having these tools and materials prepared will ensure that you have everything you need to successfully install your Trex decking. Now that you’re equipped, it’s time to move on to the first step of the installation process: preparing the area.

Step 1: Preparing the Area

The first step in installing Trex decking is to prepare the area where you’ll be installing it. Here’s how:

  1. Start by clearing the area of any obstacles, such as furniture, plants, or debris. It’s important to have a clean and level surface to work on.
  2. If you’re installing Trex decking on an existing concrete surface, you’ll need to ensure that the area is clean and free of any cracks or damage. Use a pressure washer or a brush and detergent to clean the concrete thoroughly.
  3. Next, determine the layout and dimensions of your deck. Measure and mark the boundaries using a measuring tape and chalk line. This will give you a clear guideline for the installation process.
  4. If you’re installing the deck on bare ground, it’s important to create a solid foundation. Dig post holes or trenches for the support beams, ensuring that they are deep enough to prevent shifting or sinking over time.
  5. If necessary, level the ground by removing any high spots and adding gravel or crushed stone to create a stable base for your deck.
  6. Consider the slope of the land and plan for proper drainage. You may need to install a drainage system or use sloping techniques to ensure that water doesn’t pool on your deck.
  7. Lastly, if you’re installing Trex decking on a raised deck or using posts, you’ll need to install post anchors or attach the posts securely to the ground using concrete and post hole brackets.

Once you’ve completed these steps, you’re ready to move on to the next phase of the installation process: installing the frame for your Trex decking.

Step 2: Installing the Frame

With the area prepared, it’s time to install the frame for your Trex decking. The frame serves as the support system for your deck and ensures its stability. Follow these steps to install the frame:

  1. Start by attaching the ledger board to the exterior of your house using lag screws. The ledger board will act as the anchor for the deck and should be secured at the desired height and level.
  2. Next, measure and mark the locations for the support beams. These beams will run perpendicular to the ledger board and provide additional support for the deck.
  3. Using pressure-treated lumber, cut the support beams to the desired length and attach them to the ledger board using joist hangers. Make sure the beams are level and securely fastened.
  4. If you’re building a deck with multiple levels or stairs, install additional beams and support posts as needed to accommodate the design.
  5. Once the support beams are in place, it’s time to install the joists. These are horizontal pieces of lumber that will run parallel to the support beams and provide the framework for the decking boards.
  6. Cut the joists to the appropriate length and space them evenly along the support beams, typically every 16 inches. Secure them in place using joist hangers and nails or screws.
  7. Double-check the level of the frame and make any necessary adjustments before proceeding.

By following these steps, you’ll have a sturdy and properly aligned frame for your Trex decking. This sets the foundation for the next phase of the installation process: preparing the Trex decking boards.

Step 3: Preparing the Trex Decking Boards

Now that the frame is in place, it’s time to prepare the Trex decking boards. Trex is a composite material that offers the natural look and feel of wood without the maintenance required for traditional wooden decks. Here’s how to prepare the decking boards:

  1. Measure the length of the deck and cut the Trex decking boards to the appropriate size using a circular saw or a miter saw. Be sure to leave a small gap between each board to allow for expansion and contraction.
  2. If the ends of the boards will be exposed, use a router to create a smooth and finished edge.
  3. Inspect each board for any defects or damaged areas. If you come across any boards that are warped, cracked, or flawed, set them aside and use them for cuts or smaller sections of the deck.
  4. If desired, apply a protective coating or sealant to the cut ends of the boards to prevent moisture penetration.
  5. Before installing the decking boards, ensure that the frame is clean, level, and free of any debris that could interfere with the installation.
  6. Take a moment to envision the layout and pattern of the decking boards. Consider alternating the grain pattern or creating a unique design to add visual interest to your deck.
  7. Now that the boards are prepared, you’re ready to move on to the next step: installing the Trex decking boards.

By properly preparing the Trex decking boards, you’ll ensure a smooth and professional-looking installation. Once the boards are ready, you can proceed with installing them on the frame of your deck.

When installing Trex decking, make sure to use the recommended fasteners and leave a 1/4 inch gap between boards for proper drainage and expansion.

Step 4: Installing Trex Decking Boards

With the Trex decking boards prepared, it’s time to start installing them onto the frame of your deck. Follow these steps to properly install the decking boards:

  1. Start by positioning the first board along the outer edge of the deck, ensuring that it is flush with the perimeter and the end of the frame.
  2. Secure the first board in place using deck screws, driving them through the face of the board and into the joists below. Be sure to leave a small gap between the board and any adjacent structures such as walls or posts to allow for expansion.
  3. Continue installing the rest of the boards, working your way from one end of the deck to the other. Remember to leave a small gap between each board to allow for expansion and contraction.
  4. For a more professional-looking installation, consider using trex decking clips. These clips attach to the side of each board and allow for a hidden fastening system, creating a clean and seamless surface.
  5. As you install the boards, periodically check for levelness and adjust as necessary. Use a level to ensure that the boards are even and not sloping or uneven.
  6. Depending on the size of your deck, you may need to cut some of the boards to fit the remaining space. Measure and mark the boards accordingly, and use a circular saw or miter saw to make the necessary cuts.
  7. Once all the decking boards are installed, take a step back and inspect the overall appearance and alignment of the deck. Make any necessary adjustments or tweaks to ensure a clean and professional finish.

By following these steps, you’ll successfully install the Trex decking boards, creating a beautiful and durable surface for your outdoor space.

Step 5: Securing the Decking Boards

After installing the Trex decking boards, it’s essential to secure them properly to ensure their stability and longevity. Here are the steps for securely fastening the decking boards:

  1. Using a drill or screwdriver, drive deck screws through the face of each board and into the joists below. The screws should be placed approximately 2 inches from the edge of each board, ensuring a secure hold.
  2. For a clean and seamless look, consider using color-matched deck screws. These screws blend in with the color of the decking boards, minimizing their visibility.
  3. Make sure to drive the screws in flush with the surface of the boards, being careful not to overdrive or strip them.
  4. Continue securing the rest of the decking boards until all are properly fastened to the frame. Take your time to ensure that each board is securely attached and aligned with the adjacent boards.
  5. Inspect the surface of the deck to ensure there are no loose or protruding screws. If you find any, tighten them or replace them with longer screws to provide a more secure hold.
  6. Double-check the levelness and symmetry of the deck to ensure the boards are properly aligned. Use a level to make any necessary adjustments and ensure a uniform appearance across the deck.
  7. If you opted to use Trex decking clips, follow the manufacturer’s instructions for attaching the clips to secure the boards. This method creates a hidden fastening system and eliminates the need for visible screws.
  8. Once the decking boards are securely fastened, take a moment to walk across the deck and test for any signs of movement or instability. If you notice any areas that feel loose or unstable, reinforce them by adding additional screws or making adjustments to the frame.

By properly securing the decking boards, you’ll create a solid and durable deck surface that can withstand the elements and daily use. Once you’re confident in the stability of the deck, it’s time to move on to the final step: adding the finishing touches.

Step 6: Finishing Touches

You’re almost done with the installation of your Trex decking! Step 6 involves adding the finishing touches to complete the look and enhance the functionality of your deck. Follow these steps to put the final touches on your deck:

  1. Trim any excess decking material that extends beyond the edge of the deck to create a clean and polished appearance. Use a circular saw or miter saw to make precise cuts.
  2. If desired, install fascia boards along the perimeter of the deck to cover the exposed edges of the decking boards. Fascia boards provide a finished look and help protect the underlying structure from moisture and debris.
  3. Consider adding railings or balusters to your deck for safety and aesthetics. These can be made from a variety of materials such as wood, metal, or composite, and can be customized to suit your personal style.
  4. If your deck is elevated or has stairs, make sure to install handrails to provide stability and support. Check local building codes to ensure compliance with safety regulations.
  5. Apply a protective sealant or stain to the decking boards if desired. While Trex decking is low-maintenance, sealing the boards can help protect them from UV rays, moisture, and staining.
  6. Consider adding lighting to your deck to create a warm and inviting ambiance. Options include solar-powered lights, deck post lights, or recessed lighting installed in the decking boards.
  7. Place furniture, plants, and other decorative elements on your deck to transform it into a comfortable and inviting outdoor space. Choose pieces that are weather-resistant and suitable for outdoor use.
  8. Regularly inspect and maintain your deck to keep it in top shape. Clean it periodically using a mild detergent and water, and remove any debris or leaves that may accumulate. Check for any signs of damage, such as loose screws or cracked boards, and repair as needed.

By adding these finishing touches and properly maintaining your Trex decking, you can ensure that it remains a beautiful and functional addition to your outdoor space for years to come.


Congratulations on successfully completing the installation of your Trex decking! By following the step-by-step guide outlined in this article, you have created a beautiful, durable, and low-maintenance outdoor space.

Trex decking offers a fantastic alternative to traditional wood decking with its high-quality composite material that mimics the look and feel of real wood. Not only does it provide a long-lasting and low-maintenance solution, but it also adds value and functionality to your home.

Throughout the installation process, we covered everything from preparing the area and installing the frame to preparing the decking boards and securing them to the frame. We also explored the importance of adding the finishing touches to complete the look and functionality of your deck.

Remember, regular maintenance and inspection of your Trex decking will help keep it in top shape. Clean it periodically, check for any signs of damage, and make any necessary repairs to ensure its longevity.

As you enjoy your newly installed Trex decking, take pride in the hard work you put into creating a comfortable and inviting outdoor space. Whether you plan to host gatherings, relax with a book, or simply soak up the sun, your Trex deck will provide a stylish and functional backdrop for all your outdoor activities.

Thank you for choosing Trex decking, and we wish you many years of joy and relaxation in your enhanced outdoor space!

Frequently Asked Questions about How Install Trex Decking

What are the benefits of using Trex decking for outdoor furniture?

Trex decking is a popular choice for outdoor furniture because it is durable, low-maintenance, and resistant to rot, mold, and insects. It also comes in a variety of colors and styles to match any outdoor aesthetic.
How do I prepare the area for installing Trex decking?

Before installing Trex decking, you should ensure that the area is level and free of any debris or obstructions. It’s also important to have a solid and stable substructure to support the decking.
Can I install Trex decking myself, or do I need to hire a professional?

While it is possible to install Trex decking yourself, it’s important to have the necessary tools and knowledge to do so correctly. If you’re unsure, it’s best to hire a professional to ensure the decking is installed properly.
How do I clean and maintain Trex decking once it’s installed?

To clean Trex decking, simply use a mild soap and water solution and a soft-bristle brush. Avoid using harsh chemicals or pressure washers, as they can damage the decking. Regular cleaning and maintenance will help keep your Trex decking looking great for years to come.
Can I use Trex decking for other outdoor furniture projects besides just decking?

Yes, Trex decking can be used for a variety of outdoor furniture projects, such as benches, tables, and planters. Its durability and low-maintenance qualities make it a great choice for any outdoor furniture project.

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