The Rivius Slate is an authentic alternative to slate, a material that is time-consuming, complex and costly to lay. Lay a 75mm wide bed of underlay onto the undercloak. Avoid contact between the mortar and the ends of the battens. Bed the verge tiles onto the mortar. Nail every verge tile and also secure the tails of the tiles in the verge clips. Features The Rivius is an interlocking clay tile which means that there is no need for double lapping. Due to its large clay format, it is faster to install, more cost effective to use and cheaper than traditional slate The Rivius is manufactured using bespoke moulds, crafted from the imprints of Welsh slate to ensure that the intricate texture and defined detail of natural slate is reflected in the final clay product. The tile creates previously impossible opportunities for any self-build/social housing projects which would benefit from the look of slate but need a more cost-effective product The Rivius Slate joins the New Generation portfolio - renowned for its interlocking format and ease of laying. It is an open gauge product which is around 50% more cost-effective than natural slate, whilst still providing an authentic slate appearance 10% Bigger 10% Lighter 50% more cost effective Colour will never fade All the aesthetics of slate at a fraction of the price