Composite decking is a fantastic choice for homeowners seeking a durable, low-maintenance, and visually appealing outdoor space. Learn more about The Growing Popularity of Composite and PVC Decking Materials. Unlike traditional wood decking, which requires regular sealing and staining, or pressure-treated wood, which is prone to splintering, composite decking offers superior weather resistance and long-term durability. However, installing composite decking requires careful attention to material-specific details to ensure a long-lasting and flawless finish.
Overview
This guide outlines the unique requirements for composite decking, focusing on acclimation, proper spacing, and fastener selection, along with tips to avoid common mistakes.
Acclimation and Temperature Considerations
Proper acclimation of composite decking materials is crucial to prevent warping or misalignment during and after installation. Composite materials expand and contract with temperature fluctuations, so preparation is key.
- Allow Time for Acclimation: Store composite decking boards on a flat surface for at least 48 hours before installation to let them adjust to the local environment.
- Keep Materials Shaded: Store boards in a shaded area at ambient temperature and avoid direct sunlight before cutting or securing them.
- Consider Installation Temperature: The temperature during installation can affect spacing requirements, so always follow manufacturer guidelines based on the climate. For help choosing materials, check out The Right Decking Materials: A Guide for Homeowners.
Proper Spacing for Composite Decking
Spacing is a critical factor for composite decking to accommodate thermal expansion and contraction, ensuring a stable and professional-looking deck. Composite materials are particularly affected by temperature changes because they combine wood fibers and plastic, both of which expand and contract at different rates when exposed to heat or cold.
Side-to-Side Spacing
- For TimberTech AZEK capped polymer decking: Leave a 1/8″ to 1/4″ gap, depending on the fastener type.
- For TimberTech PRO and EDGE capped composite decking: Leave a 1/8″ to 7/32″ gap, based on fasteners.
End-to-End Spacing
End gaps depend on temperature at the time of installation:
- Below -1°C: 8 mm gap
- -1°C to 10°C: 6 mm gap
- 10°C to 21°C: 5 mm gap
- Above 21°C: 3 mm gap
Wall Spacing
Always leave a 1″ gap between decking and adjacent walls or structures for proper clearance. Insufficient spacing can restrict proper expansion and contraction, potentially causing the boards to warp or buckle over time. It can also trap moisture, leading to long-term damage and decreased durability.
Fastener Selection and Installation Tips
Using the correct fasteners ensures your composite decking is secure and maintains its appearance over time. Consider SideLoc Guide 7 1/4 Extension as a reliable option for a seamless installation. Incorrect fasteners can damage the boards by causing cracks, splits, or surface deformations. They may also fail to accommodate thermal movement, which can compromise the deck’s structural integrity and longevity.
Choose the Right Fasteners
- Use screws specifically designed for composite decking to avoid damage to the boards.
- Avoid using plain, galvanized face fasteners or traditional bugle-head screws.
Fastener Installation Best Practices
- Use a minimum of two #8 x 2-1/2″ stainless steel or coated composite deck screws at each joist.
- Place fasteners at least 1-3/16″ from the board edge to prevent cracking.
- In cold climates, pre-drill screw holes to avoid splitting at the ends of boards.
Hidden Fasteners
For a clean, seamless finish, opt for hidden fasteners like HULK hidden fasteners to secure boards without visible screws.
Special Considerations for Composite Decking
- Breaker Boards: Use breaker boards running perpendicular to decking boards at butt joints to control expansion and contraction.
- Double Joists: Install double joists at all butt joints to support proper alignment and reduce movement.
- Ventilation: Ensure adequate ground clearance and ventilation to prevent moisture buildup and allow for proper board expansion and contraction. For an in-depth review, visit Tiva Deck Architectural Series or explore Tiva Deck Designer Series for unique design options.
- Reflective Surfaces: Avoid placing decking near highly reflective surfaces, as these can cause unusual UV damage or excessive heat buildup.
Pro Tips for a Flawless Installation
- Avoid Cutting Boards Too Thin: Keep board widths at least 2-1/2″ to maintain structural integrity.
- Refrain from Routing Composite Boards: Many composite boards aren’t designed for routing.
- Use Double Fasteners for Mitered Edges: Ensure stability by placing two fasteners evenly spaced and at least 1-3/16″ from the edges of mitered boards.
Common Mistakes to Avoid
- Skipping Acclimation: Not acclimating boards can lead to warping after installation.
- Improper Spacing: Failing to leave adequate gaps can cause boards to buckle or warp.
- Using Incorrect Fasteners: Using fasteners not designed for composite decking can damage the boards and void warranties.
- Ignoring Ventilation: Poor airflow can cause moisture buildup and long-term damage.
Final Thoughts
Installing composite decking requires attention to detail. Key steps include:
- Acclimate Boards: Allow decking materials to adjust to the local environment.
- Select Proper Fasteners: Use screws or hidden fasteners designed for composite materials.
- Ensure Correct Spacing: Leave adequate gaps for thermal expansion and contraction as per manufacturer guidelines.
By following these guidelines and avoiding common mistakes, you can enjoy a beautiful, durable deck that lasts for years to come. For additional insights, read The Deck Building Tips from a Professional Deck Builder.
If you’re ready to start your project, explore our selection of composite decking materials, including TimberTech Edge Prime+ Collection Dark Cocoa and TimberTech Reserve Collection Dark Roast, as well as PVC decking materials and fasteners designed for seamless installation.
Have questions about composite decking installation? Contact us at Deckstore.ca for expert advice, high-quality materials, and everything you need to build your dream deck.
