The roof cushion is waterproof on the slope roof
When the moisture generated by the ice dam into the external walls of the gap, the walls and insulation layer will become damp, which is the ideal environment for the breeding of mold.
and the formation of the ice dam will lead to roof water, water will find the path into the house.
Most of the slope roof itself is not waterproof. The role of the slope roof is used for drainage,
