Moss usually grows on north facing roofs that don't get much sun and it will thrive in damp and shady places. If left untreated it can damage a roof and cause serious damp problems.
A copper ridge cap or ridge band prevents moss from growing on your roof. Every time it rains, a tiny amount of copper sulphate is dissolved into the rain and flows down the roof preventing the moss from growing.
After fitting the copper ridge or band, your roof will be moss free for many years to come.
Note that your roof will need to be treated with a moss killer and be clear of moss first of all. The copper does not remove moss but prevents any further moss from growing.
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