Quality control and work acceptance

The water resistance of the roof from asbestos -cement sheets largely depends on the quality of preparation of the base, which for this type of roofs is different, modifications and a wooden crate. They must meet the following requirements:.The surfaces of the shelves of ruins must be placed in one plane, the runs of the runs should be even, clean, without the influx of concrete (for reinforced concrete runs), and the crate has a flat surface. The gaps between the stacked control wooden meter rail and the verified bar should not exceed 5 mm per meter of length.