At verges and side abutments, half slates must be used in alternate courses. Please note the half slates are sold in pairs, 1x left handed and 1x right handed half slate. Its chamfered edge and riven surface gives the appearance of quarried slate and matches the performance of a machine-made slate with visual appeal. Replacing Redland's iconic range of thin leading edge slates was never going to be easy, the Richmond, Saxon and Landmark Slates were the first of a new breed of concrete slates when Richmond was launched 30 years ago. Properties Nail size: 45mm x 3mm - aluminium alloy stainless steel annular. 45mm x 3.35mm ring-shank. Slate finish: smooth - through coloured & painted. Certification BBA certified. 2nd generation performance The Slate 10 range retains and enhances the practicality and visual appeal of the originals, so it offers class-leading performance as well as aesthetics. Lower minimum pitches, unique single nail fixing and no requirement for eaves or top slates are just some of the ways in which we've enhanced their value. Designed with a riven surface and chamfered edge to give the appearance of authentic quarried slate, Saxon 10 matches this visual appeal with the convenience and performance of a machine-made slate. With a minimum pitch of 17.5 Saxon offers the design flexibility to produce roofscapes of quality and distinction. Saxon 10 is available in two vibrant, rich colours, a traditional Black and an authentic Blue. Saxon 10 Blue replicates the traditional blue-grey slate from the heart of Snowdonia whilst the Black is a good match for the black-grey slate of Scotland. Uniquely within the Redland range, these colours have a high quality paint finish, creating a strong and consistent roofscape. Certification BBA certified.