Removing moss from rooftop tiles and slates


A common request many of our customers at Kidderminster Roofing Supplies ltd will be asked by their clients is if they can remove the moss from their roof top.

To the inexperienced, removing moss from a roof may seem very simple, however reality is that moss removal can potentially cause even more damage if done incorrectly.


What causes moss to grow on a rooftop and what damage can it cause?

To deal with moss on a roof, first we need to understand what causes moss of a roof and the damage it can cause.

Moss and algae love to grow anywhere which is damp and shaded, making rooftops and gutters the perfect place to live. This moss that grows on the rooftop can then cause damage to the tiles or slates by both holding water, causing roofing materials to rot, or even causing trapped water to freeze and expand, resulting in damage to the tiles or slates, making them move, slip or even crack. Moss can even grow into the tiles or slates themselves, making them weak.

With excessive damage to tiles or slates as a result of years of moss, removing moss from a rooftop can be a very dangerous job, which should only be handled by someone who knows exactly what they are doing.


How not to remove moss

We often are asked at Kidderminster Roofing Supplies ltd how to approach removing moss from a rooftop, and there are many misconceptions about the best approach this particular job. Here are some of the questions we are asked below:


Question: Can the moss be pressure washed off the rooftop?

Answer: No. A pressure washer will only further damage the rooftop and tiles or slates as it is too abrasive.


Question: Can I use chemicals or a cleaner to remove the moss?

Answer: We wouldn’t recommend it. There are many products on the market that claim to remove moss from tiles and slates, however in our experience, moss will often grow into the tiles or slates, and using harsh chemicals and cleaners on a tile or slate surface will only aim to remove the protective coating from the roof tiles or slates, making them weaker and more susceptible to further moss damage. Not only this, however moss removing chemicals can be damaging to the environment, potentially harming both plants and animals.


Solutions and options 

Although moss may now seem to be a never-ending issue, there are some solutions and options we here at Kidderminster Roofing Supplies ltd can suggest removing or reduce a rooftop moss issue.

Brush or scrape the moss from the tiles or slates – Using a scrubbing brush, you can gently brush moss from roof tiles or slates to reduce damage to them. You can even use a shovel to scrape the moss from the tiles or slates. This option would require regular treatments to ensure the moss does not mount up, which may seem inconvenient to a client, however will save money in the long run.

Re-roof – If a roof is too far gone with moss to simply be brushed away, and the damage has already been done to the tiles or slates, a re-roof may be the only option to remove all the moss from the rooftop.

Leave the moss alone – It may seem an unusual option, however if a roof is too far gone to simply brush the moss away, yet your client cannot afford a complete re-roof at this particular time, the best option would be to leave the moss alone. Although it may be tempting to pressure wash the tiles or slates or put a treatment on it, it may cause far more damage to the overall roof than to simply leave it alone, resulting further issues such as leaks.


Tools for the job

To attempt to remove moss from a rooftop, you need the correct tools and equipment to do the job safely and effectively. Here at Kidderminster Roofing Supplies ltd, we stock everything you need to do the job right. Contact us today to see how we can help with you!

Tel: 01562 748270


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