My garden, my pride!

How To Get Rid Of Moss On The Roof?

, Admin

The spread of moss on soft shingles is one of the most common problems with this type of roofing. The debate about whether moss is so harmful to the shingles and whether it must be removed is still going on. And the arguments on both sides are quite substantial. But even if the appearance of moss on the roof of the house you like, sooner or later have to think about limiting its spread, because the area of green growth on the roof will only increase over time. Methods to combat moss can be very different, but without labor-intensive work not do.

How to get rid of moss on the roof?
Moss overgrown tile roof. © sigroofing

While moss is often a nuisance and other types of roofing, it is on the shingles, he is one of the major problems encountered in almost any location of the house on the north side of the slope. And for homes located in the woods, among the trees, construction with insufficient insulation or improperly calculated slope moss is inevitable after a few years after laying the entire area of the roof.


  • What harms shingle moss and its factors
  • Mechanical or physical methods of controlling moss
  • Copper "rescues" against roof moss
  • Chemicals and herbicides against roof moss

What harms shingle moss and its factors

Green roofs, in which plants are used as an additional insulator, a means of effective insulation of buildings, today at the peak of popularity. But this type of eco-roofing does not include moss growing on a conventional roof. Unlike specially created green roofs, here it is a parasitic plant, along with lichens.

Destructive effect of moss on the roof is controversial: to some extent, such a coating plays the role of additional protection and protects the shingles from destruction. But the collateral impact of moss and lichens on materials and roof structures are negative, and without exception, tile manufacturers argue that such an aesthetic enhancement is worth getting rid of as soon as possible. And for this there are a number of reasons:

  1. Moss retains moisture.
  2. The moss affects the impact of negative temperatures and transitions from positive to negative, which are very poorly tolerated all types of shingles, especially soft roof.
  3. Moss and lichens create the perfect environment for the development of bacteria, dust, other plants, as well as for beetles, ants and other insects. Most companies specializing in shingles, claims that moss increases the gap between the elements of the roof.

On the other hand, mosses absorb moisture, which can penetrate the material and protect it from degradation under water. But this "plus" does not outweigh the negative impact of mosses.

Mosses and lichens are considered a specific problem of soft roof. Despite all the beauty, this material requires a specific approach and special conditions. In the greatest extent affected by mosses and lichens are roofing materials, which have a porous, rough surface. This applies not only to soft shingles, but also the cement-sand, composite, ceramic, conventional metal roofing tiles with a matte finish and even asbestos-cement sheets.

Factors that lead to the spread of moss are the same for all types of roofs. Mosses and lichens threaten a roof when the roof is improperly laid or excessively contaminated, such as in the woods or near large trees. Proximity to a swamp or body of water increases the likelihood of their spread.

Moss usually appears on the north and northwest sides of the roof. Notice the first signs of damage to the roof lichens and moss can not be earlier than 3, and often 5 years after laying the material.

Combat moss is more difficult than to prevent its appearance. Important preventive measures - prevent the accumulation of dirt, dust, leaves, sand, stagnant moisture, weeping materials, quality control work. Prevention - the best method of control and in the case of construction of the house, covered with soft tiles, and when you choose other materials.

Even in the planning stage should think about the measures to prevent the appearance of moss and lichen. Special roll materials of copper in the form of tapes and a fine mesh copper installed under the tiles and ridge element before laying, but such "pads" in our country are still not popular.

If you are faced with the problem of moss and lichens on the shingles, then do not despair: there are many methods of struggle, and choose your own version can each.

Mechanical or physical methods of combating moss

Cope with moss simple treatment magic wonder drugs without removing already appeared moss and dirt from the roof will not work. Cleaning the tiles from the accumulation of dirt can be seen as a basic method of combating the problem or as the first step to get rid of moss forever. But in any case, such cleaning will have to be carried out.

How to get rid of moss on the roof?
Mechanical cleaning of shingles from moss. © cotswoldperiodroofing

There are two methods of mechanical removal of moss from the tiles:

  1. The most reliable, productive and popular - cleaning a powerful mini-wash, pressurized water jets which will completely rid you of moss on the surface of the tiles and other impurities. Remember, only high-power washers are used for this purpose and the work should not be carried out from the bottom up and down, directing jets over the shingles, from the ridge to the eaves so that the jet does not fall into an overlap or under the material.
  2. Manual cleaning with brushes and water. This is a more time consuming method, and less productive. On the thoroughness of the work depends not only on whether you can remove all the formations, but also possible damage to the material itself. Work with the roof should be very carefully, but as scrupulously as possible, removing all dirt and plant debris from the roof. To wash, use hard and medium-hard brushes made of natural bristles only. Initially, moss is removed by dry brushing, and then thoroughly wash the entire roof, getting rid of residual dirt and plants.

We should consider that the manual or mechanical cleaning of the roof from moss is a temporary measure and will get rid of the problem for a maximum of 1 year. If you want to confine yourself to mechanical treatments, then prepare yourself for the fact that the procedures for cleaning shingles will have to repeat regularly. If you want to get rid of the need to conduct a complex procedure of washing the roof at height, fraught with danger and considerable physical exertion, then after cleaning it is necessary to take measures to prevent the occurrence of moss and lichens in the future.

Copper "saviors" from the moss on the roof

In order to get rid of the problem with overgrowth on a soft roof without chemistry, you need to use copper-containing preparations or install on the roof of a special device that enrich the rainwater with copper ions and prevent the spread of moss. After all, copper is the easiest and most reliable helper among the natural enemies of moss.

Special copper-containing products can be found in construction stores and specialized firms. Today their range is expanding considerably, and despite their considerable cost, such preparations show high efficiency in the fight against moss. Most often, such preparations are labeled exactly as means intended for the destruction of moss.

How to get rid of moss on the roof?
Cleaning tile roofs from moss

There are also so-called structural methods of treatment involving the use of copper. The simplest method is the installation on the ridge of a copper brush, special boards or plates made of copper. They are mounted from above, cost a lot, require fixing copper nails, but very effective (this is how to combat the problem in Scandinavia).

Another versatile and more affordable method - moss control on the roof with the treatment of copper vitriol. This method works best after the moss has been removed with a sink or by hand. Spraying of shingles with a solution of copper sulfate allows you to prevent the appearance of moss for many years.

If you use this method of control as a basic without mechanical cleaning, in order to cope with the problem, you will have to resort to several treatments and then carry them regularly. Traditionally, the same concentration of the solution as for fruit trees is recommended - from 350 to 500 ml per 10 liters of water.

Chemical means and herbicides against moss on the roof

The manufacturers of soft tiles to control moss on the north side of the roof recommend using a solution of 1 part of chlorine bleach mixed with 10 parts of water. Such solution is applied to the surface of the roof with a sponge, necessarily in the direction from the ridge to the eaves.

When necessary, large growths of lichen are first removed with soft brushes, and then the roof is treated with the solution. But the use of such a solution cannot but affect the plants growing near the house and can harm the ecology of the garden. For such a method to be effective and not to harm your area, all the liquid must be collected, keep an eye on the gutters and ensure that during the work the solution is not splashed on the surrounding area.

Bleach can also cause damage to the materials of the facade, windows, wooden constructions. Yes, and processing will have to carry out regularly, twice a year, in spring and autumn, on windless days with an air temperature of 5 to 15 degrees.

A lot easier in the application of special agents designed to combat moss and lichen on the roof, many of which belong to the biological preparations. Basically, these specialized compounds are made in Scandinavian countries. Apply them with a sponge or sprayer, they work up to 4 years, and if you choose the right product is absolutely safe for the garden. True, we still find them difficult, and the price makes us think about the expediency of this method.

Any systemic herbicide designed for garden plants can be used to combat mosses on the roof. Treatment with a solution of the drug can completely destroy the moss and lichen colony. The method of treatment - spraying or hand-washing - requires taking into account the possible harm to the body, take protective measures and affect the surrounding areas (eg you can not use the terrace for a few weeks).

How to get rid of moss on the roof?
Cleaning roof tiles from moss with a high pressure machine. ©7>

You can also deal with moss and preparations for cleaning swimming pools from algae, but their effect on the ecology of the garden is even more devastating.

To protect the roof cleaned by hand or washed, special antiseptics for ceramics, concrete and stone and various protective impregnations, but in their application must be considered the type of roof. And there is always a risk of whitewashing the roof and violating the aesthetics of materials.

Prevent the spread of moss due to increased surface smoothness and improve the rolling of water is possible by covering the shingles with additional special protective varnish or silicone impregnation (if the roof material allows).