DuoPlain combines the classic proportions and good looks of traditional plain tiles with all the time and cost-saving benefits of a modern, large-format interlocking tile. Engineered for strength, ease of handling and ease of installation, it fulfils the three main demands of a modern roofing site. Now available in seven popular colours with the addition of our brand new Blue, DuoPlain also comes with a full range of matching fittings and accessories. Properties Size: 268mm x 330mm. Minimum pitch: 25. Maximum pitch: 90 - subject to fixing specification. Minimum headlap: 80mm. 95mm. Maximum headlap: 173mm. Minimum gauge: 188mm. Tile thickness: 17mm. Coverage: 17.7 tiles/m2 at maximum gauge. Weight: 3.1 tonnes/1000. Batten size: 38mm x 25mm - rafter centres up to 450mm. 50mm x 25mm - rafter centres up to 600mm. Battens required: 5.26m/m2. Nail size: 40mm x 3mm - aluminium alloy. 45mm x 3.35mm - stainless steel ring shank. 38mm x 4.2mm - stainless steel screws. Tile finish: through coloured & acrylic coated. Certification BBA certified. DuoPlain Tiles conform to BS EN 490: 2004 Concrete roofing tiles and fittings for roof covering and wall cladding - Product Specifications.