Non-metallic building materials for roofs; non-metallic cladding panels for roofs; non-metallic composite materials for use in roofing; non-metallic materials for roofs; non-metallic materials for use in surfacing roofs; non-metallic ready mountable parts for roof constructions; non-metallic roof components for buildings; non-metallic roof coverings; non-metallic roof panels; non-metallic roof structures for supporting tiles; non-metallic roof tiles; non-metallic roofing; non-metallic roofing boards; non-metallic roofing boards having insulating properties; non-metallic roofing materials; non-metallic roofing panels; non-metallic roofing tiles; non-metallic roofs; non-metallic roofs for building structures; non-metallic roofs for buildings; roof coverings, not of metal; roof non-metallic materials; roofing of non-metallic materials; roofing slates; roofing, not of metal; slate roofing products; slates for roof cladding