woodsmith
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There are various chemicals available but they don't give a lasting protection. To eradicate the moss for years you would need to fix a copper or zinc flashing to, or just below, the ridge. Westfalia sell a self adhesive copper strip which would do the trick if you can get up to the ridge safely. Trouble is it doesn't look very sightly having a broad copper band stuck to the roof. You may be able to get some thin sheet copper and fabricate something yourself, perhaps try a small area first and see how well it works.
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