Remove the hard top layer of the ground. Prepare the base layer from well compacted gravel mix. Depending on the type of ground and type of load to be impacting on the STELLA GREEN® grate, for vehicle traffic prepare a base layer up to 30 cm thick and for pedestrian traffic zones - up to 15 cm thick. It shall be followed by 400g/m2 geotextile, needed generally for keeping fine elements of lining layer separated from lower layer. Water permeating from the top surface layer, takes fine particles down. Geotextile stops that washing process, protecting the road load bearing structure from weakening.
Pour the 5-7 cm thick levelling layer of soil particle grouping properties, using sandy gravel of l-7mm particle sizes. Carefully compact (Condense) the sandy gravel layer and level the surface under the STELLA GREEN® grate. Never perform the compacting and levelling operation in temperature lower than 2°C.
After the load bearing layer preparation phase is finished, laying the grate can be started. STELLA GREEN® grates have special male/female hooks which fasten separate grate elements together. During the assembly there is no need to use mechanical equipment, as the weight of each element is approximately one kilo. Pay special attention to edges, where the grates shall be bordered with kerbs similarly as regular pavement slabs, with 5 cm distance between the last row of grates and bordering kerb for possible extensions. Especially in summer, the grates shall be filled in directly after finishing the work, dividing the work areas in sectors. STELLA GREEN® grates can be cut with chain saw and located outside pipes and wells. While laying grates on slopes or roadsides, pay special attention to the structure of installation, which in the phase of laying the grates and pavement will be constructed of stable drainage materials. In case of steep inclination, use ground anchors.
After the above operations are finished pour thefilling layer over the whole area, 1 cm above the level of modules at maximum. In order to ensure the optimal growing of grass, the grate cells shall be filled in with a mix composed of 40% of sand, 30% peat and 30% clay. In order to ensure fast and sustainable growth of grass, drought resistant grass varieties are recommended. Before planting, carefully water the ground through spraying. After finishing the planting phase the grass shall be often fertilised and watered until the lawn is ultimately formed. With adequate moistness the ground filling the grates will lower by approx. 1-1.5 cm leaving the lawn some space to grow, eliminating at the same time the risk of damaging the lawn by pedestrians or vehicles.