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For alkali, bitumen, algae and mould resistance across a selection of floor joist and decking applications, this RDA-7 self-levelling adjustable decking pedestal is constructed from recycled polypropylene. Able to withstand 2100kg compression and operate in temperatures ranging from -40C to 120C, the pedestal is fantastic for height corrections between 300mm and 400mm.Time wasting installations can be cut down without the need for any shims while correcting heights and making adjustments. This pedestal is provided with a height extension collar that allows build-ups of up to 100mm and includes a threaded section to ensure that all adjustments are accurate down to the millimetre. Features & Benefits: RynoDeck RDA-7 Self-Levelling Adjustable Decking Pedestal 300-400mm, Appropriate for a wide assortment of decking and floor joist applications, Time saving without the need for shims, Load spreading to prevent damage to membranes, Crafted from recycled polypropylene for algae, bitumen, alkali and mould resistance, Cost-efficient, Allows for height adjustments between 300mm and 400mm, Suited to temperature range of -40C to 120CThe wide support base efficiently protects membranes from enduring any weight related damage and, with versatile joist lugs for differing bearer widths of up to 100mm, the self-levelling bearer support head uses a ball and socket joint to form a pristinely level system with corrections up to 10.5%, or 6. The head itself can be interchanged with a deck tile head for applications that require decking tiles rather than timber.. RynoDeck RDA-7 Self-Levelling Adjustable Decking Pedestal 300-400mm Black Polypropylene