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Professional Building Supplies£16.61Visit shop Pbsl Group Standard Woodgrain / Grooved Composite Decking Joist - 40Mm X 30Mm X 3600Mm
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Designed for professional landscapers and DIY enthusiasts, these 40mm x 30mm x 3600mm composite decking joists provide a stable, long-lasting foundation for outdoor flooring projects. They are engineered for high-performance structural support on flat, solid surfaces; however, they are not suitable for direct installation on soft ground like grass or sand, which can lead to structural failure.
| Model Part Number | 3050010165 |
|---|---|
| Brand | PBSL Group |
No. These joists require a solid, flat, and stable surface to prevent structural failure.
For diagonal board installations, joist centres should be reduced to 250mm.
Use double joists for butt joints, with one clip on each side and an 8mm gap between board ends.
If the joists are used above ground level, 250mm centres are strongly recommended.
The gap allows for natural thermal expansion of the material and prevents water from pooling.
Verify that the base surface is perfectly flat and rigid; remove any loose sand or uneven paving materials.
The joist centres may be too wide for the board type; reduce spacing to 250mm or 300mm as recommended.
Ensure that butt joints are supported by double joists and that the mandatory 8mm expansion gap is maintained.
Installation requires a firm, level base such as concrete or stone. Do not attempt to level these joists on uneven paving or soft earth, as movement will occur over time, leading to loose boards or structural cracks. For elevated decking projects, strictly adhere to the 250mm centre spacing to ensure user safety. Maintain consistent drainage by ensuring the joists are not obstructed, and always use appropriate clips during the boarding process to facilitate the 8mm expansion gap necessary for the material's life cycle.
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