From Klober
GRP Valleys provide a robust, durable and lightweight alternative to lead and zinc valleys. Area of application 20° maximum pitch variance 17.5° - 60° rafter pitch. Options for tile and slate pitched roofs. Key Features Lightweight and flexible to handle for a safe and easy installation. A cost effective alternative to lead. Fire tested to comply with BS 476: Part 3 SAB and Part 7 Class 3.