20/40mm Shingle 40mm Shingle 20-40mm marine dredged shingle Downloads Deliveryicon-button-arrow-green Description We have many uses for this material, and most recently we have seen a large growth in its use a fire break for green roofs. It is also commonly used for drainage purposes and as a pathway material. Downloads icon-technical-document-alt-normal-text 20-40mm Roofing Sh... icon-downloads-greenDownload Other Products View Allicon-button-arrow-green 20mm All In Ballast Concreting Ballast Concreting Marine Dredged 0/20mm Primary View Product 2/6mm Granite Drainage Sub-Base View Product 4/10mm Shingle Pea Shingle Driveways Drainage Runs Decorative Amelioration View Product 0/6mm Horticultural Grit Neutral ph Drainage Opens Clay Soils Marine Dredged View Product