Decking Accessories
The long-term performance of timber decking depends on more than just the boards. Correctly specified fixings and accessories are essential to ensure durability, stability and a consistent finish over time.
Premature failure of decking is often linked to poor fixing choices or inadequate detailing at the interface between deck boards and the supporting structure.
We stock a carefully selected range of decking accessories designed to address common challenges including movement, moisture retention and ease of installation.
As with cladding, we strongly recommend stainless steel fixings for all external decking. Lower-grade alternatives will corrode, leading to staining, fixing failure and reduced service life.
Specification Guidance
When specifying fixings and accessories for timber decking, we recommend that you consider the following:
1. Use stainless steel throughout
Prevents corrosion, staining and premature failure
2. Match grade to exposure
Use A2 for general use and A4 for coastal or high-exposure environments
3. Allow for movement
Deck boards will expand and contract. Fixing systems must accommodate this
4. Manage moisture
Ensure ventilation and drainage at the board/substructure interface
5. Consider maintenance and replacement
Select a fixing system that allows individual boards to be removed if required
Stainless steel decking screws
Direct fixing remains the most common method for installing decking boards, offering speed, simplicity and ease of replacement.
We offer both A2 (304) and A4 (316) stainless steel screws to suit different exposure conditions:
- A2 stainless steel – suitable for most decking applications in typical UK conditions
- A4 stainless steel – recommended for coastal, high-exposure or polluted environments
Elita2 A2 Stainless Steel Decking Screws
A high-performance decking specific screw designed for efficient and reliable deck board fixing.
Key features:
- A2 stainless steel for corrosion resistance in standard external conditions
- 5mm shaft for added sheer strength
- Cutting notch tip improves penetration and reduces splitting
- Optimised thread reduces insertion force
- Good bending properties, suitable for timbers with higher movement
- Driver bit included
Available sizes:
- 5.0mm x 50mm
- 5.0mm x 60mm
Simpson A4 Marine Grade Stainless Steel Screws
Recommended for coastal areas and other demanding environments.
Key features:
- A4 (316) stainless steel for coastal and high-exposure use
- Ribbed countersunk head for a flush finish
- Type 17 point reduces splitting
- 6-lobe drive for improved torque transfer
- Minimises staining on tannin-rich timbers
- Driver bits included
Available sizes:
- 4.2 × 55mm
TENI Hidden Deck fastener
A simple concealed fixing system designed for thermally modified timber decking and high-spec installations.
Key features:
- No visible fixings for a clean, uninterrupted deck surface
- Fixed and sliding point system allows each board to move independently
- Prevents stress transfer between boards, avoiding chain movement across the deck
- 8mm spacer improves ventilation between deck boards and substructure
- Integrated mechanism allows individual boards to be easily replaced
- Board profile that doesn’t weaken the edge
TENI hidden deck board installation and replacement guide
Gumo D decking ventilation strip
A simple but highly effective way to improve durability by managing moisture at the interface between deck boards and the substructure.
Key features:
- Reduces persistent wet spots around fixings
- Extends the life of decking and supporting structure
- Reduces stress on fixings caused by moisture-related movement
- Narrow 15mm profile minimises contact area
- Supplied in rolls for fast and consistent installation
Available size:
- 10m × 6mm × 15mm
BASO deck board spacer
A spacer system designed to improve ventilation, drainage and installation efficiency.
Key features:
- Maintains consistent gaps between deck boards
- Promotes airflow and reduces risk of persistent wet spots
- 6mm height reduces shear stress on fixings during movement
- Speeds up installation through integrated spacing
- Can be adapted for start and end boards
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