Roofing

Expert advice on roof repairs, maintenance, replacements, storm damage and everything homeowners need to know about keeping their roof safe, secure and weatherproof.

Benefits of Cleaning Your Roof

4th February 2022

A buildup of moss on your roof can lead to serious (and expensive) problems. You can’t afford not to get your roof cleaned - we discuss what you should know.

You may not think about your roof unless you have a leak that needs to be fixed. However, your roof has a very important job! It keeps you warm and dry and protects your home and contents. While a tiny bit of moss here and there may not seem like a big deal, a build up of moss and debris can lead to serious (and expensive) problems. Don’t make the mistake of thinking you can’t afford to get moss and algae removed; the cost of repairing the damage it causes means that you can’t afford not to get your roof cleaned.

How can moss and algae damage your roof?

As time goes on, mildew, moss and algae will inevitably build up on your roof. This problem isn’t just unsightly; it will damage your roof over time if you are not careful.

Moss can make roof tiles and slates porous, which makes it possible for rainwater to filter into the material. This moisture retention can lead to cracked tiles in freezing temperatures, as the water turns to ice and causes the tiles to burst.

Spongy in nature, moss is incredibly absorbent, so will retain water on your roof after rainfall or heavy dew. This can add a significant weight to your roof, and, in freezing temperatures, the freeze and thaw process of moss can crack or dislodge your roof tiles which can lead to costly leaks within your home if not fixed quickly.

How to remove roof moss

There are several ways that you can demoss your roof, with or without cleaning products. A professional roof cleaning service will be able to recommend the best course of action for your roof type, and depending on how heavy the build up of moss is already. Moss cleaning without a cleaning agent involves the use of a high pressure washer which effectively removes a build-up of moss and algae, as well as other debris, such as twigs and leaves.

If using a cleaning agent, specialist protective clothing is required; your roof cleaning specialist will spray your roof with an agent that will gradually kill the moss, before washing the agent and the debris away. The use of a cleaning agent is advised in cases where the tiles are old or delicate, and where the roof cleaner is concerned that the use of a high-pressure washer could damage the roof.

Moss prevention

As with many home maintenance issues, prevention is better than cure. Once you have invested in removing the moss from your roof, it is wise to do what you can to prevent it from growing back. After cleaning, you can treat your roof with a moss resistant product which will slow any regrowth. A more permanent solution is an anti-moss coating, which can help prevent regrowth for a prolonged period of time.

By investing in your home now, you can save money in the long term. Take a look at our directory of trusted local roof specialists or follow us on Facebook or Twitter for more information.

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Looking for more roofing advice?

Find clear, practical answers to common roofing questions, helping homeowners understand everyday issues, know what checks they can carry out safely, and when it is best to contact a qualified professional.

How do I know if my roof needs repairing or replacing?

A few broken tiles or a small patch of damaged flashing? That's usually a repair job. But if your roof is over 20 years old, leaks keep coming back in different spots, or you're seeing sagging or widespread cracking, replacement is probably the smarter long-term call. A proper inspection from a roofer will give you a straight answer before you commit to anything.
What are the signs of a leaking roof I shouldn't ignore?

Water stains on ceilings, damp patches on walls, mould in the loft, or daylight peeking through the roof boards - all worth acting on quickly. A musty smell upstairs can also point to a slow leak, even when there's nothing visible. Roof leaks don't fix themselves, and the longer they're left, the more damage they do to insulation, timbers, and your ceilings.
Is moss on my roof a serious problem?

Not an emergency, but don't leave it too long. Moss holds moisture against the tiles, which can work its way underneath and cause cracking in winter. It'll also block your gutters if it spreads far enough. Getting it professionally cleaned and treated is the way to go - it's not a job to DIY given the risks of working at height.
What happens if I delay getting my roof repaired?

Small problems get expensive fast. A few displaced tiles can leave the felt underneath exposed to weather damage, and even a minor leak can cause timber rot, saturate insulation, and eventually ruin ceilings and walls. What could've been a straightforward repair becomes a much bigger project the longer you leave it, so it's best to get it sorted sooner rather than later.
How do I temporarily protect my home if my roof is damaged in a storm?

If tiles are missing or water's getting in, the priority is limiting the damage until a roofer can get to you. A heavy-duty tarpaulin over the affected area is your best bet - make sure it extends well past the damage and is secured so it doesn't lift in the wind. Inside, move furniture out of the way, put buckets down, and use towels to manage any water coming through. Don't go up on the roof yourself as wet tiles are dangerously slippery.
What types of roofing materials are best for UK homes?

Clay and concrete tiles, natural slate, and EPDM rubber for flat roofs are the most common on UK homes. Clay tiles are durable and handle our freeze-thaw winters well - though they're heavy, so not every roof can take them. Slate looks great and can last over a century done properly. For flat or low-pitched roofs, EPDM rubber has largely replaced traditional felt because it holds up much better against UV damage and standing water. The right call depends on your roof's pitch, your property's age, and what the structure can support.
How quickly can I get an emergency roof repair?

Most roofers offer emergency callouts, but response times vary. In quieter periods, someone might get to you within a few hours. After a big storm when everyone's calling at once, you might be waiting a day or more. If there's a delay, get a tarpaulin over the damage in the meantime. One thing to watch: be wary of anyone who knocks on your door unsolicited after a storm offering to check your roof - it's a well-known scam.
What are green roofs and are they worth it?

A green roof has a waterproof layer topped with soil and plants - usually sedums or grasses for a low-maintenance version, or something more garden-like if you want to go further. They insulate well, soak up rainwater, and are good for local wildlife. They can also extend the life of the waterproofing underneath by shielding it from sun and temperature swings. Whether it's worth it depends on your roof's structure and what you're hoping to get out of it. Installation needs to be done professionally - a leak underneath a green roof is a far bigger headache than on a standard flat roof.

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