Nearly everyone agrees that moss grows in abundance wherever moisture and shade are plentiful. Until then most of us are faced with choosing other methods of moss removal. Unfortunately, not all of these methods work.
Zinc Strips kill moss. The moss dies and the roof stays moss free for 10 feet under a zinc strip for five years or so if it stays in place and stays flat. Homeowners can install strips of zinc, purchased at a hardware store.
I had zinc strips applied to my roof and they do keep the moss at bay. They were slid under the edge of shingles, but were nailed in. Not sure about caulking them in.
Log in or Sign up. It's covered in "architectural" asphalt shingles. The shady sides the Northern sides are beginning to show black streaks -- which from what I understand is a type of algae. The best way to permanently prevent this - from what I've read on the web - is to install copper or zinc flashing under the top course or ridges of the roof.
Here are the recommended roof installation procedures for Zinc Strips. Then we will explain our experience with copper, zinc strips — Installation issues. Install the strips every 2 to 3 feet down the roof and across it.
While black stains on roofs are a cosmetic issue, moss growth is more than just cosmetic. Not only does moss look terrible on roofs, it will also shorten the life of the roof covering and possibly lead to roof leaks. Whether you have wood or asphalt shingles, moss can grow on the roof if it doesn't dry properly.
Zinc Strips General Information: Zinc strips are usually considered the long-term solution to controlling mosses see photo at right: skylights are surrounded by galvanized flashing that has suppressed the growth of mosses below the skylights. The remaining parts of this cedar shake roof are covered mainly with the moss Dicranoweisia. Zinc strips and galvanized flashing are apparently relatively safe and inexpensive.
In this video, This Old House general contractor Tom Silva shares tips for keeping a roof free of moss and mold. You can cut strips of zinc flashing copper and lead work, too and slide them under a course of roof shingles to kill lichen and moss growing there, or you could just buy these premade strips from Shingle Shield. The premade ones are much quicker and probably neater looking. It's not a bad idea to suggest to customers that overhanging tree branches are what's keeping their roof moist in the first place and allowing the vegetation to grow.