1220mm x 820mm x 20mm Castellated Floor Panels for Water Underfloor Heating System. Solutions for a modern world since 2001 High Specification Castellated floor panels for fast installation of your water underfloor heating pipe (15/16/17mm) Your pipe is clipped & held securely by the raised section ensuring even heat distribution across your floor. • Total size 1220mm x 820mm x 20mm • Suitable for 15mm, 16mm, and 17mm pipes • Pipe Centres can be at 100mm, 150mm, 200mm & 250mm • Easy to install • Made from Recycled High Impact Polystyrene • Minimum amount of waste • Eliminates pipe contact with insulation • Each Panel will cover approx 0.96m² (when overlapped) • Colour black.