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How to Prevent Moss Colonising Your Roof

If you live in a damp climate, you may find that your roof suffers from moss growth. Moss thrives on shingle and tile roofs, where it can cause extensive damage. Consider replacing your existing roof with a metal one as moss is virtually unable to gain a foothold on metal roof sheets.

In the meantime, here are some tips on how to prevent moss from colonising your roof.

moss on roof

Keep it Bright and Light

Moss thrives in damp, dark conditions. By keeping your roof exposed to the sun, you stand more chance of preventing moss growth. Cut back any overhanging branches or bushes to allow maximum sunshine penetration and keep moss at bay.

Clearing Away Moss

The easiest and quickest way to shift existing moss is to use a garden hosepipe to wash it off the roof. Any stubborn plants can be shifted by using a wallpaper scraper and a bit of elbow grease. Remember to clear any fallen moss out of your gutters too so that they don’t become blocked and overflowing.

Killing Residual Moss Spores

Once you’ve shifted any existing moss, you will need to kill off any remaining seedlings or spores. The easiest way to do this is by making up a mild solution of household bleach and warm water and simply pouring it over the worst affected areas on the roof.

someone raking the lawn

Chemical Bases

The most effective chemical for shifting moss that is hard to reach is zinc. You can buy zinc in pesticide form from your garden centre or hardware store. All you need to do is dissolve the zinc powder in water and wash down the roof. The zinc will kill the moss plants and their spores, preventing regrowth too. The only drawback to this method is that soluble zinc is toxic and may eventually wash down into the ground water system.

A much more environmentally friendly alternative is zinc strips. Zinc strips are a few inches wide and can be nailed onto the roof, just below the peak. Rainwater runs down the roof, over the zinc, dissolving a small amount and carrying it away over the moss, effectively killing it. Such a small quantity of zinc won’t harm the environment, but it will deal with the moss.

The easiest way of ensuring that your roof doesn’t suffer from moss damage is to replace your existing tiled roof with a metal one. This is particularly desirable if the roof concerned is in dark shade that you can’t do anything about, for example, shade from another building.

For more advice on replacing your existing roof with a metal one, contact us today.