Starting at the foundation, every element of the drainage plane must be installed so it will direct water out and over the layer below it. Correctly flash roofs, windows and doors. Don’t forget about flashing mechanical penetrations in walls and wall blocks.
How to prevent and deal with ice dams, short and long term. Includes causes of ice dams such as different roof surface temperatures. Ice dams can lead to the growth of mold so action needs to be taken to deal with ice dams.