Sports pitch with grass playing surface and substrate stabilized by rock wool

摘要

The foundation is stabilized by rock wool granules that, because of their irregular shape, are not easily displaced. Sand provides drainage. Organic materials such as humus and compost nourish the grass. The thickness of the rock wool layer is increased where wear is greatest, eg. the penalty area The foundation layer (1) of sand is at least 0.25m thick and contains drainage pipes at most 4m from each other. A further sand layer (2) is 0.08m thick. A layer of humus (3) is also 0.08m thick. A layer of clean rock wool (4) is of granules of up to 3mm size. Other layers can be triple-super-phosphate fertilizer (5 assumed), compost (6) and a mixture (7) of the previous two.