Description Redland's Westminster Slate is a large format, single lap interlocking flat clay tile with variable gauge with a full range of complementary fittings and accessories.   Westminster Slate is a cost effective high-performance roof covering. With a tapered leading edge providing an exceptionally thin appearance and a hidden interlock, Westminster Slate is an elegant clay tile, engineered to perform at pitches as low as 17.5.    With a coverage of less than 10 tiles/m, it is quick and easy to install offering savings in both materials and labour. Available in 3 classic colour choices: (79) City Black, (80) Cardinal Red and (82) Old College Red. Colour Cardinal Red is the natural red colour of the fired clay itself. When using Cardinal Red Slates, use Rosemary Red Half Round Ridge Tiles.   Technical Size (overall): 480 x 326mm Minimum pitch: 17.5 The minimum pitch is based on a maximum rafter length of 10 metres. Maximum pitch (subject to fixing specification): 90 Minimum headlap: 110mm Maximum headlap: 140mm Minimum gauge/batten spacing: 340mm Maximum gauge/batten spacing: 370mm Hanging length (approx): 452 mm Linear cover of one slate: 280 mm Covering capacity (at max gauge): 9.7 tiles/m Covering capacity (at min gauge): 10.5 tiles/m Weight (at max gauge): 47.5 kg/m Weight (at min gauge): 51.5 kg/m Battens required (at max gauge): 2.7 m/m Battens required (at min gauge): 2.9 m/m