Underfloor Heating Aluminium Spreader plate - 20No. Adept Underfloor Heating Aluminium Spreader Plate 1000mm x 390mm - 200mm Pipe Spacing Channels 20No. Aluminium Spreader Plates in the Pack Aluminium Double Spreader Plate (1000 mm x 390 mm) with channels 200mm apart to enable a homogenous heat transmission. The secure positioning of the pipe is guaranteed by a 1/2 round groove running the length of the plate. Used for wood flooring fixed between joists at 400mm centres using suitable screws or nails. Full 2 Year Manufacturer's Guarantee. Installation All our products have been selected so they can be installed by a competent DIY'er. However, some works are covered by legislation and must be carried out by a qualified / authorised trade’s person.