Homeowners can take two approaches to prevent moss growth.
How do i stop moss growing on my roof.
The best way to prevent moss from growing on your roof is to minimize its ideal growing environment.
Regular maintenance and cleaning is often enough to keep your roof in a healthy condition.
Overhanging tree branches help create the perfect environment for moss to grow.
When it rains the rainwater hits the copper wire and leeches out moss killing particles which run down your roof tiles and kills off any moss trying to regrow.
Consider trimming tree branches to expose your roof to more direct sunlight.
Removing buildup and debris on your roof goes a long way in ensuring that moss algae and lichen have less of a chance of spreading.
That water is sometimes leaked in between shingles and through the roof.
The branches and leaves offer shade from the intense sun.
You can prevent moss from growing on your roof tiles by installing copper ridges to your roof.
Using high pressure water is likely to create some of its own damage by delaminating tiles and even potentially lifting roof tiles or dislodging flashing and eroding the pointing of parapet walls.
Limit shade and clear any debris that could lead to moisture on your roof.
Copper is more toxic to moss and algae but zinc is.
Stop a moss problem from returning by installing strips of zinc or copper coated sheet metal just below the top ridge on both sides of the roof.
Over time as rain falls zinc residue coats the roof to prevent moss growth.
In fact one way to prevent moss from growing in the first place is to attach zinc strips to the ridge of your roof.
First keep your roof clean.
Most of it should come off quite easily although you might have to scrape out a few stubborn areas using your scraper.
Keep your gutters clean and remove fallen branches and debris.
Is there a long term solution to stop moss growing back on the roof.
If you want to avoid damage to your roof here are some ways to prevent moss from growing on your roof from the start.
Fix a length of copper or zinc wire all the way across the top of your ridge tiles.
The simplest way to do this is to climb onto the roof with a length of hose attached to a water source and wash the moss off.
Spray the moss covered roof with a moss control product or sprinkle the material on depending on the product formulation.
When rainwater falls on these ridges a coppery residue is released and runs down the roof discouraging moss growth.