At verges and side abutments, Tile-and-a-Halves must be used in alternate courses with Concrete Plain, Heathland and Rosemary Clay Tiles. The Rosemary name is synonymous with clay plain tiles, adding distinction and character to pitched roofs for over 175 years. Today, a range of single and cross-camber tiles combine the quality of hand-crafted clay with the reliability of modern machine-made techniques. Produced from the finest clays, Rosemary is offered in a range of weathered, brindled and single colours that create striking and attractive roofs. The latest addition to the range is the Heather Brindle, an orange sanded tile, with distinct purple brindling to create strikingly attractive roofs. Properties Nail size: 40mm x 2.65mm - aluminium alloy nails. Tile finish: smooth finish. Tile profile: clay plain tile. Certification BBA certified. Rosemary Clay Classic Plain Tiles conform to BS EN 1304: 2013 Clay roofing tiles and fittings - Product definitions and specifications.