Moss Removal from Your Roof

Small patches of moss on your roof is harmless. However, moss grows quickly and can spread to a larger area of your roof in a short time. Moss can cause major damage to your roof. If your roof has been covered by moss for a long time, don’t attempt to remove it yourself. We recommend you hire a professional to handle the job.
 
Moss growth thrives in cold damp areas that are shielded from the sun. By spreading its spores, small patches become large patches on your roof. For instance, sections of your roof that are shielded from sunlight like trees are good areas for moss growth. Moss acts like a sponge absorbing moisture which results in your roof being constantly wet. This results in your roof rotting and decomposing.
 
What are the causes of moss growth?
Mild winters, autumn rainfall and the beginning of spring are good periods for moss growth. Very little moss grows in summer due to sunlight. Areas with a lot of trees or extended branches close to your roof would create shaded areas for moss growth.
 
If your property is blocked off by taller buildings or does not get enough sunlight it will be a good area for moss growth. As moss absorbs and retains water, there is the possibility of your roof tiles suffering from winter cracks.
 
North-facing tiled roofs are prone to moss growth as they quickly take root in dark or hidden areas between and under roof tiles, shingles or slates. Roof tiles that are made of clay or cement are susceptible to moss growth. Porous surfaces on clay and cement and constant exposure to rain and damp conditions are the perfect environments for moss to root down and spread effectively.
 
Should moss be removed from my roof?
Moss growth on your roof does not mean you should panic. As indicated earlier, small patches of moss growth are harmless however larger patches could become a problem if left unchecked. They block gutters and prevent your roof drainage from functioning properly. This will challenge the integrity of your roof if the water is not draining properly.
 
The gutters on your roof benefit immensely from removing moss as they work more efficiently with fewer blockages. Less maintenance is required and costly repairs or replacements are completely avoided.
 
Large patches of roof moss can reduce the lifespan of your roof over time. Moss are living organisms that depend on food to live. They feed on roof shingles, tiles and slates. Besides, some manufacturers of roofing products use preservatives that attract moss. A roof covered by moss will have a hotter attic which will drive up your energy bills.
 
What is the best way to remove moss from a roof?
There are different ways of removing moss from your roof depending on how far it has spread. The options include using the DIY approach of a stiff brush and roof scraper, using roof moss removal chemicals and using copper or zinc strips.
 
To save on costs, some homeowners may adopt the DIY approach while others hire a professional. Our recommendation is to use a professional as they have the know-how, know the latest techniques and have the necessary tools for the job. Professionals are experts at treating your roof so that you do not have a repeat of moss growth on your roof.
 
The DIY approach of using a stiff brush and roof scraper is cost-effective. However, you must be confident of getting up the roof and careful with the tiles and shingles to avoid breakage. With a brush and roof scraper, you manually scrape the moss from your roof using a long-handled brush. Start from the top and work your way down. A ladder, safety clothing and footwear and plastic sheets to cover your lawn, flowerbeds or garden are some essentials for this job. This is best done on a dry day.
 
Using moss removal chemicals is another option for getting rid of moss from your roof. There are some homemade remedies as well as products to be purchased from shops or hardware stores. Whatever product used make sure it is not toxic or can discolour your roof tiles. A good product is oxygen bleach powder because it is safe to use. Chlorine beach and table salt are corrosive and ineffective. Remember the purpose of clearing moss from your roof is to protect your roof and not to create more problems.
 
Before applying the chemicals, you will go through the process of clearing the moss on the roof first with a soft brush and roof scrapper. When all the moss is cleared then you can spray the chemicals over the affected area. Moss removal chemicals are strong and can kill plant life so it is important to make sure that your flower beds, lawns and gardens are covered to prevent contact. Follow the instructions on the product and when finished, leave the roof to dry for at least 30 minutes. Next, using a sprayer, rinse your roof with water washing away the chemicals. Work safely and be aware of the risks of draining water off the roof. One benefit of using chemicals is that it reduces possible moss growth in future.
 
Another great option of removing and preventing moss growth without damaging the roof tiles is the use of zinc or copper strips. These strips are installed below the ridges of roofs and are effective when used with new roofs during installation. They are fitted at the ridge at the top of the roof so that rainwater carries the metal particles from the metal strip over the moss as rain goes down the roof. The metal particles kill all plant life on your roof. It prevents any growth of plant life as well.
 
Small amounts of moss on your roof should not be considered a major issue. Often this can be cleaned thoroughly and washed away with a hosepipe to get the roof back to its original condition. Large patches of moss should be treated immediately.
 
How much is roof moss removal
The average cost for roof moss removal for a standard property in the UK is between £250 and £500 depending on the location and the size of the roof. How large the moss patch is and the type of moss patch also plays a role. For instance, it is easier to remove green moss and harder to remove black moss. For larger properties like detached homes with a separate garage, roof moss removal costs range between £700 to £1000 again depending on the location and size of the property.
 
Whatever option you choose, it is important to understand the factors that cause moss growth. Overhanging trees, satellite dishes, and anything that creates shades on your roof will encourage moss growth. If it's trees then trim them. If it’s a satellite dish have an annual roof cleaning plan.