Having trouble with moss on your roof?

If you live in a rural area or one that is particularly green (lucky you!) you may have a lot of problems with moss on your roof, or are worrying that it could be causing damage that could cost you money in the long run.

We’ve written a guide to help you make a decision regarding the moss on your roof, and understand why it is there and to dispel any myths. And of course we’ll be showing you how to prevent or treat moss on your roof.

Why has moss started growing on my roof?

With the industrial revolution bringing massive change to the UK resulting in factories and power stations churning out chemicals into the atmosphere, acid rain was a massive problem. These days with the onset of environmental awareness and less pollutants the atmosphere is a lot less toxic than it once was.

Algae and moss are very sensitive to acid rain, and back in the 80s when the clouds were full of pollutants the rain prevented any growth – now the air is so much cleaner moss is able to grow in abundance.

Will it damage my roof?

Depending on what your roof is made out of, yes, moss could damage your roof. Check our list below to see whether you need to be concerned.

Concrete tiles

Moss can grow in holes or cracks that are a natural part of concrete, however it is not the moss that causes the problem, and rather the poor quality of the tile itself.

Clay tiles

Moss can cause problems with clay because clay needs to be kept dry. Moss will only grow in moist conditions, and will prevent clay tiles properly drying out.


Slates are a natural material but is non-porous, so even if a slate roof is covered in moss the slate will not be affected.


Cement can develop cracks and holes, and eventually decompose over time. Moss can weaken cement further.

Pipes and gutters

Moss can block pipes and gutters, then expand resulting in brittle plastic snapping and breaking. If left long enough, moss can become very heavy and overwhelm the structures holding the gutters and pipes in place.


Lead like slate is totally natural and non-porous and will not be damaged by moss growth.

How to remove moss from your roof

There are two ways to remove moss from your roof, and you can either do it yourself if you feel confident doing so, or get a roofing firm in to do the job for you. You can either remove the moss by scraping and brushing it away, or power wash. Sometimes it is a better idea to have a roofing firm in to do the job because most times there will be some repair work required that the moss has hidden from view., and they can advise on the best course of action.

How to prevent moss growing on your roof

You can prevent moss from growing on your roof by chemically treating your roof with a specialist fungicide, and only then once the moss has been removed, and this will only last a couple of years (at most) before requiring treatment again. You can reduce moss growth by removing anything that could block sunlight hitting your roof. Look at any trees nearby that could be blocking the sun, or a TV aerial or dish. These will create a shadow and moss loves to grow in shady areas.

If you’d like to get a professional roofing firm to have a look at the moss on your roof, contact Total Roofing Solutions. They are a top firm for roof repair in Preston.


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