Combining lightweight aggregates with varying amounts of organic matter creates a lightweight planting media for intensive and/or extensive rooftop gardens. These designer soils can be created or altered to meet design specifications or address precise project requirements. Designer soils are often required for rooftop gardens, raised planters, containers and urban tree plantings.
Natural sand and soil are heavy. Because of their weight, structural modifications are often required to incorporate a green roof into a project’s design. Native soils have silts and clays that may clog the filter materials or drainage layer and reduce effectiveness. The physical properties of natural volcanic aggregates vary widely with source and location. Organic materials may degrade and compact over time, and require additions to or replacement of planting media. Some horticultural products used in greenhouses and container planting, such as vermiculite and perlite, are extremely light in weight and do not offer adequate anchorage and support for larger plants. In exterior applications vermiculite and perlite often float to the top of the planting media where they can be carried away by wind or water.
HydRocks® is the lightest of the expanded lightweight aggregates in the U.S. and is an all-natural, eco-friendly, non-degradable soil enhancer. HydRocks® has a higher absorption rate than competitive products and helps neutralize acid rain runoff and maintain pH levels in the growing medium.
There’s a meadow five stories above the busy city streets of Nashville complete with green grass and rolling hills. This green space in the sky is actually the roof of a new convention center in the Music City.