This will prevent leaves, small branches and other debris from building up and keeping the roof wet. Gutters and downspouts need to be cleaned regularly, usually in the spring and fall. Never let a downspout drain directly onto a lower roof surface. Cedar needs to breathe, and therefore needs to be kept clean. Do not allow leaves, branches or other debris to build up on the roof.
Ensure ventilation is available, year round.
Areas with louvers, ridge vents, roof vents, and soffit vents need to be kept clear and never blocked off. Adequate ventilation ensures heat and moisture do not build up in the attic area. These products are ideal for areas of high humidity. Contact the treatment company for warranty details. There are hundreds of companies offering topical roof spraying and cleaning services.