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Professional Building Supplies£39.30Visit shop Pbsl Group Standard Woodgrain / Grooved Composite Decking Joist - 61Mm X 41Mm X 3600Mm
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Designed for professional landscapers and DIY enthusiasts, these 61mm x 41mm x 3600mm composite decking joists provide a durable, rot-resistant structural foundation for your outdoor living area. They are ideal for creating a stable substructure that complements composite decking boards, though they require a perfectly level surface and precise spacing to ensure structural integrity and longevity.
| Model Part Number | 3050010160 |
|---|---|
| Brand | PBSL Group |
The maximum recommended joist center distance is 300mm.
Yes, you must reduce your joist centers to 250mm for diagonal patterns or elevated installations.
Use double joists with one clip on each side and maintain an 8mm gap to account for drainage and thermal expansion.
No, these must be laid on a solid, flat, and stable surface to prevent structural damage.
Yes, as a composite product, they are highly resistant to moisture, rot, and insect degradation compared to traditional timber.
Check the joist spacing; if it exceeds 300mm (or 250mm for diagonal/elevated), add additional joists to support the span.
Ensure that a double joist configuration was used and that the 8mm gap is maintained for thermal expansion.
Verify the sub-base is completely flat and level. If the base has shifted, the joists must be shimmed or the base re-leveled.
Before beginning installation, ensure the ground is leveled and debris-free. Use the 300mm spacing rule for standard layouts. For all butt joints, install a double joist row to ensure proper fastening and drainage. During maintenance, simply clear debris from between the gaps to ensure the structure remains ventilated and moisture does not pool. Always inspect the subframe annually to ensure that the ground or support structure has not shifted, maintaining the integrity of the 8mm drainage gaps.
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