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 coste 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 simple and quick 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 Old College Red is a red tile with subtle and random brindle patterning. When using Old College Red Slates, use Rosemary Light Mixed Brindle 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