Common mistakes while installing composite?

Installing composite decking requires careful planning and attention to detail to ensure a durable and visually appealing result. Here are some common mistakes to avoid:

1. Insufficient Expansion Gaps
Composite materials expand and contract with temperature changes. Failing to leave adequate gaps between boards can lead to warping or buckling.

1mm for temperatures above 26°C

3mm between 4°C and 25°C

6mm for temperatures below 4°C

2. Poor Ventilation Beneath the Deck
Proper airflow beneath the decking is crucial to prevent moisture buildup, which can cause rot and structural issues. Ensure a minimum 35mm gap between the ground and the underside of the decking boards to allow for adequate ventilation.

3. Using Substandard Subframes
The subframe supports the entire decking structure. Using old or untreated timber can compromise the deck’s integrity over time. Consider using treated timber, plastic lumber, or steel subframes, especially in areas prone to moisture.

4. Incorrect Joist Spacing
Composite decking requires closer joist spacing than traditional wood to prevent sagging. Joists should be spaced between 250mm to 350mm apart, depending on the product specifications.

5. Incompatible or Improper Fasteners
Using the wrong clips or fasteners can restrict the natural movement of composite boards, leading to damage. Always use manufacturer-recommended fasteners designed for your specific decking product.

6. Direct Fixing Without Clips
Screwing directly into composite boards can cause splitting and restrict movement. Utilize hidden fastener systems that allow for expansion and contraction while maintaining a clean appearance.

7. Neglecting to Treat Timber Joist Ends
Untreated timber joist ends are susceptible to moisture ingress, leading to rot. Ensure all cut ends are properly sealed or treated to prolong the subframe’s lifespan.

8. Improper Fascia Installation
Incorrectly installed fascia boards can trap water and debris, causing damage over time. Ensure fascia boards are installed to allow for drainage and are not stretched over the ends of deck boards.

9. Inadequate Planning and Measurement
Poor planning can lead to material wastage and an ill-fitting deck. Accurate measurements and a clear layout plan are essential before commencing installation.

10. Ignoring Manufacturer Guidelines
Each composite decking product may have specific installation requirements. Not adhering to these guidelines can void warranties and compromise the deck’s performance.