Properties and Benefits: LECA has superb water-draining properties and, being a lightweight product, is easy to transport and handle. It can also be blended with other growing mediums such as soil and peat and can help to retain moisture around plants and flowers. LECA can be used as insulation on roofs, for heat-proofing stoves and ovens and as a component in lightweight concrete or lime concrete Approximate coverage of 20m2 per tonne at 25mm (1 inch) thick. This product has been photographed in a wet condition. All aggregate images have been taken from the same height for comparison purposes.