Roof Drains in Seattle. A residential condo property in the Seattle area had leaking 4 inch roof drains that were affecting many of the residents. To shut the building down and move people out of their homes was not an option. A local Seattle contractor came to the rescue and relined the original copper roof drains with the Perma-Lateral inversion system – one roof drain was 163 feet and the second was 174 feet. This saved the Seattle property time and money by relining the roof drains.