Apart from new construction, modernization and rehabilitation of glass structures, Kräss also offers an efficient system approach for the roof backfitting of steel greenhouses. The proven KS system brings older leaking glasswork up to the standard of a maintenance-free Variolux aluminium greenhouse. To upgrade to the KSplus system, even insulating roof coverings up to 16 mm thickness are possible. You can preserve the long term value and productivity of your greenhouse facilities at a low cost.