Hi Mike, I love in Kodiak, Alaska. We see a lot of moss growth on roofs here. Sometimes even young spruce trees growing. We have used zinc strips, I believe called "moss out" I have also seen copper strips or copper pipe fastened near the ridge. Seems to work better than any chemical spray.
Subscribe to Fine Homebuilding magazine now and save up to 52%
© 2017 The Taunton Press, Inc. All rights reserved.
Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features.
Start your subscription today and save up to 52%