Natural Sea Cobbles in sizes from 20mm to 40mm. These naturally rounded cobble stones are a blend of subtle greys and browns giving an aesthetically pleasing finish. We recommend these cobbles for use on green roof installations. Use as a fire break, to provide free draining areas or to help create habitats on biodiverse roofs. In summary, install garden cobbles in accordance with the GRO code . Install them in a border 300mm wide around all perimeters, including rooflights and rain outlets. Secondly, they should also be installed 500mm wide where there are building openings like doors, windows or opening roof lights. Thirdly, install the cobbles to a depth of 50mm or at least to the same depth as the substrate / plant layer. …and finally use an edging product to provide separation in the fire break to ensure there is no substrate in the fire break. More information can be found in the GRO Code Natural Sea Cobbles – Features 20-40mm (stone width) Rounded Easy to handle Coverage 2.4 bags per linear meter will result in a depth of 50mm. Cobbles – Suggested Uses As a fire break on living roof installations. In the creation of dry free-draining areas. Helping with habitat creation on biodiverse roofs. Adding to decorative landscaping for pathways etc. Pond creation and rock pools. Important – we cannot guarantee that all pebbles are rounded and smooth. Cobbles are a naturally quarried product so sizes may vary.
