| If correctly applied, sheet steaming is easy and economic. Heat resistant and rot resistant insulating fleece saves up to 50% energy, reduces the steaming time considerably and improves the steaming efficiency. Areas up to 400m? can be easily steamed in one operation, in 4 - 5 hours, to 25 * 30cm depth / 90°C. If the special insulating fleece is used (5mm thick/500g/m?), the steaming time is reduced by approximately 30%. Adequate weighting bags (10cm dia) or twin bags (2 x 10 cm dia), minimum 10kg/m, are imperative for steaming large areas. Sheets and fleece must be weighted down together. The most important requirement, with all steaming systems, is that the soil is loosened up before the steaming process to ensure optimal results. Rotovating alone is not suitable, as the structure of the soil becomes too fine and will not be sufficiently permeable to steam. The ideal way is to loosen the soil is with a spade-machine, the deeper the better! The best preparation for the steaming process is to have coarse soil at the bottom and a surface milled to max 10cm deep on the surface. The steam is led under the sheet by an injector, protected by a wooden tunnel 2m long x 30cm wide. If the sheet width is greater than 6m, the steam is led through a distributor and 2 injectors. By using the injector, an advantageous mix of steam and air is achieved. The sheet is inflated quickly and protected by the layer of air. The sheet must be protected with sacks at the injector, to prevent burning. | 
