Marley feature tiles should only be used with roof pitches of 70° and below, bands of feature tiles should be confined to a maximum of four courses. These bands must then be separated by a minimum of four courses of standard Plain Tiles. These measures are designed to reduce the risk of water ingress and wind uplift caused by the reduced tile head-lap inherent with these tiles. Ridges, hips, valleys and verges are the most vulnerable points of any roof and therefore careful detailing in respect of feature tiles should be considered. It is advised that Feature bands of tiling should be avoided directly adjacent to Bonnet/Arris hips, valley tiles or verges. Feature tiles should terminate against a standard Plain Tile at least two tile widths away from detailing/fitting. To assist in maintaining a broken bond pattern Feature tiles are available in both standard tile and tile-and-a-half formats.