Wafter Head Timber Screws – Exterior Green

Exterior Green Wafer Head Timber Screws are designed as a modern alternative to traditional coach screws, providing strong timber-to-timber fixing with a neater, lower-profile finish.

Coated with a multi-layer corrosion-resistant exterior plating tested to 1,000 hours salt spray resistance (BS EN 9227:2012), these exterior wood screws are ideal for decking frames, fencing, sleeper walls and general landscaping applications. The green finish blends well with pressure-treated timber, making them suitable for visible outdoor projects.

The wafer head design provides a wide clamping surface while sitting flatter against the timber than a hex head screw. This improves pull-up performance while maintaining a cleaner visual result.

A TX recess allows secure driving with reduced cam-out, while the helix shank removes debris during installation to improve clamping efficiency. The sharp 25° point and single slash tip help reduce splitting, even at lower edge distances.

In most softwoods and treated timbers, a pilot hole is not required. For dense hardwoods or when fixing close to edges, pre-drilling is recommended.

For highly corrosive environments or when working with tannin-rich timbers such as Green Oak, A4 stainless steel screws should be used instead.

What Are Wafer Head Timber Screws Used For?

Wafer head timber screws are commonly chosen where:

• A strong exterior fixing is required
• A low-profile head is preferred
• Improved clamping area is beneficial
• Landscaping and decking structures need a discreet finish

Typical applications include:

• Decking subframes
• Sleeper retaining walls
• Fence rails and posts
• Pergolas and garden structures

Available Sizes

Choosing the Right Length

As a general guide, select a screw that penetrates approximately 2–3× the thickness of the top timber into the base material.

• 25–30mm boards → 75–100mm screws
• 35–50mm timber → 100–150mm screws
• 50mm+ structural timber → 150mm+ screws

Selecting the correct length ensures maximum holding strength and long-term stability in outdoor structures.