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This self-levelling joist support system is perfect for levelling uneven floors & supporting roof decking. Fully tested to meet BS5399 standards, it handles high loads with precision thanks to its unique design & buttress thread. Ideal for balconies, roof terraces, & decking, it features a recycled plastic body that keeps joists off the roof deck & away from drainage. Adjustable to accommodate roof falls, it offers a 90mm diameter, 65mm height, & 7kN/m2 load capability. No packers are required, it features 10mm to 40mm adjustability, with greater heights achievable using base plates. Suitable for timber floors over concrete sub-bases, this cradle enables a soft-sprung feel & fast installation, eliminating the need for cementitious screeds. Great for fast-track building programs or conservatory floors, it acts as a load support, so ensure the sub-base can handle the load. The load table is based on standard joist sizes, & load distribution can be improved by using more cradles.. Roofing Superstore Adjustable Decking & Flooring Joist Cradle - 10 to 55mm Black Recycled Plastic