Feedback from customers resulted in the development of roof weathering that allow access to birds. These items are fitted to comply with conservation needs associated with barn owls access etc when converting barns, re roofing etc.
Pigeon fanciers who want to use their roof loft space to expand there hobby have also used these products. Being of sheet lead it lends itself to the undulations associated with slate roofs. Roofing operators are familiar with the material and have the skill, tools and knowledge to fit so as to enhance the roof.