Face-Fastening Composite Decking: Questions for Your Installer

Why Choose Face-Fastening for Composite Decking?

Face-fastening involves driving screws directly through the face of the deck board into the joist below. This method offers several advantages. It often provides a stronger mechanical connection, which can be beneficial for high-traffic areas, stair treads, or where specific structural requirements are in place. For certain board profiles or situations where hidden fasteners are not suitable, face-fastening is the primary option. It also allows for easier removal and replacement of individual boards if needed in the future.

While hidden fasteners create a clean, unblemished surface, face-fastening can offer a distinct aesthetic, especially when color-matched or plugged fasteners are used. It's a traditional method that many installers are highly skilled in, potentially simplifying the installation process for certain project types.

Understanding Manufacturer-Approved Fasteners

The most critical aspect of face-fastening composite decking is using only manufacturer-approved screws. Composite materials differ significantly from natural wood, and standard wood screws may not perform correctly, potentially leading to issues like mushrooming (raised material around the screw head), cracking, or insufficient holding power. Manufacturers like Trex, TimberTech, and Fiberon specify particular types of screws designed for their products.

These specialized screws are often made from corrosion-resistant materials, have specific thread patterns to grip composite material effectively, and feature heads designed to sit flush or countersunk without damaging the board. Always consult the specific product documentation for your chosen composite decking line to identify the exact screw type, length, and material recommended. Using non-approved fasteners can void product warranties.

For example, some manufacturers recommend specialized composite deck screws with an aggressive thread and a reverse thread to minimize mushrooming. Others might suggest color-matched screws or screws specifically designed for use with a plugging system.

The Role of Pilot Holes and Countersinking

Unlike some wood installations, pilot holes are almost always required when face-fastening composite decking. Pilot holes prevent splitting, cracking, and mushrooming of the composite material, ensuring a clean, secure connection. The size of the pilot hole is crucial and will be specified by the decking manufacturer, often correlating with the screw gauge.

Countersinking is also a common practice, allowing the screw head to sit flush with or slightly below the deck board surface. Some specialized composite deck screws have self-countersinking heads, while others may require a separate countersinking bit. Proper countersinking contributes to a smooth, finished appearance and prevents the screw heads from being a tripping hazard or catching debris.

Your installer should be familiar with the exact pilot hole and countersinking requirements for your chosen product. Confirming these details ensures the longevity and appearance of your deck.

Achieving a Finished Look: Plugging Systems

For those who prefer the strength of face-fastening but desire a cleaner aesthetic than exposed screw heads, plugging systems offer an excellent solution. These systems typically involve a specialized screw and a corresponding composite plug made from the same material and color as your deck boards. After the screw is driven, a small, tapered plug is inserted and tapped into the countersunk hole, effectively concealing the fastener.

Plugging systems require precision. The screw must be driven to the correct depth, and the plug must fit snugly. Many manufacturers offer their own proprietary plugging systems or recommend specific third-party options that are compatible with their decking lines. This method creates a highly finished look, blending the fastener seamlessly into the deck surface. When discussing face-fastening with your installer, inquire about the availability and process for using a plugging system if aesthetics are a high priority.

Remember that not all composite decking lines are designed for plugging systems, so always verify compatibility with your specific product choice.

Worked Example: Face-Fastening a Perimeter Board

If a plugging system were specified, the screws would be driven to the required depth to accommodate the plugs, which would then be inserted.

This example highlights the need for precise measurements, correct tools, and adherence to manufacturer guidelines for both screw type and installation technique.

Before you order

• Verify manufacturer-approved screw types for your specific composite decking.
• Confirm pilot hole size and whether countersinking is required.
• Discuss the aesthetic preference: exposed screw heads, color-matched screws, or a plugging system.
• Understand the screw spacing and placement requirements for your deck board width and joist spacing.
• Ensure your installer is experienced with the chosen fastening method and product.
• Review the warranty implications of using non-approved fasteners.

Confirm installation details, approved uses and warranty terms in the current instructions for the exact product and profile. Your installer should verify the substrate, structure and applicable project requirements.

Questions to help you decide

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