FIELD: construction.
SUBSTANCE: on a sinusoidal shaped sheet there are transverse stiffening folds arranged at the angle to the short side of the shaped sheet to form relief maps in the form of parallelograms.
EFFECT: improved sealing of sheets along the inclined coupling line, with preservation of water-draining properties of covers at minimum angles of water-draining surface inclination.
2 cl, 8 dwg
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