Living in the Pacific Northwest means that having moss on your roof is virtually inevitable. Moss typically grows on the north sides of the roof structure and also anywhere shade is prevalent. Heavy moss can compromise the integrity of your roof shingles and thus cause damage to your roof.
Roof Cleaning/Moss Removal
There are a number different types of moss killing products on the market. Placing these products on your roof will effectively kill the moss but will not remove it. They will only serve to turn the live, green moss to a dead, brown moss that will still be attached to your roof.
There are essentially only two processes that remove moss from your roof: brushing and pressure washing.
Brushing the moss off your roof typically involves the use of hard bristle brushes or brooms. It is very labor intensive and takes more time than pressure washing. It is also a much less efficient cleaning method. Much of the dirt that is in place to hold the moss is left behind. This provides a welcome environment for the next season’s moss spores that will attach to your roof to grow.
Pressure washing the moss off of you roof using a low pressure has many advantages. It completely removes any traces of dirt or moss from your roof, leaving only a clean roof behind. It is less labor intensive, and also less abrasive on your shingles.
Here are the Pros and Cons to each method:
Cons – Less effective total cleaning; more labor intensive; more expensive; more abrasive on roof shingles vs. power washing.
Cons – Un-trained technicians could damage your roof; messier cleaning process.
At Contrast Cleaning Services, we will clean your roof according to the method that you prefer (brushing or power washing). We do prefer, however, to clean roofs by pressure washing. We believe that not only do the pros outweigh the cons vs. the brushing method, but pressure washing just makes more sense. Why? Because we think of it in just the same way as we think about cleaning off anything else. You wouldn’t want to brush remove dirt and soil from your car, driveway, or siding. Pressure washing gets the job done much faster and much more efficiently. Our technicians are carefully trained to gently remove the moss from your roof, providing you with peace of mind.
Roof Moss Treatment/Prevention
It is possible to keep moss from growing on your roof. The best thing you can do to keep moss from growing on your roof is to keep it clean and to treat it with moss inhibitor once or twice a year. Moss needs shade and moisture to grow. If it is possible for you to keep these two things off of your roof, you will have less moss growth. Keep debris off your roof to keep it as dry as possible. You can trim trees back, but that could be expensive, and most of us like some shade on our homes in the summertime.
If you have moss on your roof, it will need to be totally removed before applying a moss treatment (otherwise it will only serve to turn your green moss brown). After we completely remove the moss, we will apply a moss inhibitor treatment to prevent future moss growth. Having us come back out once a year to reapply the inhibitor is the cheapest and most efficient method of keeping your roof moss free.
There are a few different methods of prevention that are effective in prohibiting moss growth: Zinc Strips, Bleach, and Zinc Sulfate.
Types of Treatment
Bleach is a common outdoor cleaner. It is sold in most products that are used to clean things outside. Bleach is an effective moss killer. However, it is more of a temporary fix, than a permanent one. It fails as a long lasting preventive treatment, but is effective at killing moss quickly.
Zinc Sulfate is a powder that is sprinkled on your roof or mixed with water and sprayed on. In our experience, it is more effective when applied as a powder. Zinc Sulfate powder does not kill the moss as quickly as bleach will, however, it is much more effective as a long term moss prevention method. Its only drawback is that it is not safe for the environment when it is used in large quantities. For this reason we do not prefer to apply it mixed with water and sprayed on, as a greater quantity of zinc is used unnecessarily, and this water mixture then drains down your gutters and into the storm drain system. We have found the zinc sulfate to be effective in small amounts. Therefore we apply it conservatively to protect your roof and the environment. We charge only a nominal fee to have us reapply the inhibitor annually or biannually.
We will provide you with the moss prevention method that you desire. We can install zinc strips, apply bleach, or zinc sulfate. Regardless of which method you choose, we have the knowledge and expertise to completely remove the moss from your roof, and to further prevent it from growing back in the future, giving your roof longer life and keeping your investment looking its best.
At Contrast Cleaning Services safety is our main concern. While working on your roof we not only utilize fall protection gear when necessary, but we use fall prevention gear as well. We prefer to use rock climbing gear to keep our technicians safe. This enables us to work on even the steepest of roofs. Once thoroughly trained, our technicians become certified in roof safety and advanced rock climbing methods.
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