DutchLine - Composite Joist - Dark Brown - 40x25

The DutchLine Composite Joist in dark brown, measuring 40x25 mm, provides a stable foundation for any decking construction. This joist delivers the load-bearing capacity required for a durable outdoor deck, creating a level, solid base onto which decking boards can be reliably fixed. The dark brown colour complements natural timber accents beautifully, offering a subtle, unobtrusive finish beneath your decking.

The composite material from which this joist is manufactured combines the benefits of timber and plastic in a single product. Thanks to its composite structure, the joist is resistant to moisture, mould, and rot, allowing it to retain its load-bearing function for years without subsidence or deterioration. The compact 40x25 mm cross-section provides ample rigidity for standard loads and remains dimensionally stable, even under changing weather conditions and temperature fluctuations.

Installation of this joist is straightforward and requires no specialist tools. The joist can be placed on existing substrates, foundations, or adjustable pedestal supports, and offers a flat surface for mounting decking boards with clips or screws. By combining the joist with DutchLine decking boards and matching fixings, you create a cohesive and reliable level-deck system suitable for both residential gardens and commercial outdoor spaces.

• Composite material – rot- and mould-resistant for long-lasting durability
• 40x25 mm dimensions – compact yet stable load-bearing structure
• Dark brown colour – discreet appearance that sits neatly beneath decking boards
• Low maintenance – no treatment or painting required
• Dimensionally stable – minimal expansion under temperature changes
• Moisture-resistant – retains its shape when in contact with water
• Easy to install – suitable for DIY and professional applications

Item number: JE100
EAN: 8721189804969

Netherlands & Belgium: Order before 2pm, delivered within 2 working days

Germany: 1–3 working days

Rest of Europe: 3–8 working days

See our delivery page for more information here.

We offer a 30-day returns or exchange policy if you're not completely satisfied with your order for any reason. For more information, please see our Returns Policy here.