As the air temperature is reduced, moisture, which accumulates on the surface of your roof, carries a slightly different type of threat, the formation of ice begins, which occurs due to the fact that there is a small temperature difference between the attic and between the outer air. Ice carries great damage to your entire drainage system. So, in order to completely protect the internal drain, in order to ensure free flow of water in the sewer, before the severe frosts should be opened, a special traffic jam should be opened. It is this manipulation that will allow you to avoid clogging and clogging with snow pipe. If the snow is touched on the roof, this will lead to the fact that all the materials of the roof pie can be slightly moistened. This danger then increases when there is no correctly performed ventilation.