For fixing Roof Tiles, Slates, and sheets, Batten colour may vary. The battens are blue in colour indicating that each individual batten has been assessed, graded and complies with the strength requirements of BS 5534: 2003 A1: 2010. The battens are manufactured from timber selected from approved sources in accordance with BS 5534: 2003 A1: 2010 and graded by an optical grading machine prior to the application of a redpigmented preservative treatment.     For use as part of a timber roof structure to support concrete, clay, fibre-cement, natural slate or metal roofing tiles and/or bitumen or wooden shingles in accordance with BS 5534: 2003 A1: 2010.