The period of operation of asbestos-cement slate reaches 50 years. However, with proper care, the lifespan of the roofing material can be significantly extended. One of the prerequisites for the durability of the slate is its painting. As a result of staining, a protective layer is formed on the surface, and the roof itself acquires an attractive appearance.

1. Do I need to paint slate?
2. What paint is better to paint slate: tips for choosing
3. Step-by-step painting of slate with your own hands
   • Calculating the volume of paint
   • Surface preparation
   • Slate painting technology
4. Practical advice from specialists

Do I need to paint slate?

Asbestos-cement slate has long been considered the most popular roofing option due to its good performance and affordability. And today, many people prefer this particular material when erecting buildings for various purposes.

Easy to install and inexpensive slate has some disadvantages:

• not attractive appearance;
• tendency to overgrowing with lichen, moss;
• gradual decrease in strength characteristics under the influence of weather conditions and external factors.

Slate is a porous material prone to the appearance of microcracks. The moisture accumulated in the pores turns into ice during the first frosts and gradually "breaks" the material from the inside. The same deformations are inevitable when lichens and mosses grow on the surface.

Painting of asbestos slate will help to solve the listed problems. After painting, a strong film forms on the surface of the roof, covering the access of water and microorganisms. As a result, the destruction processes are suspended, and the service life of the slate is extended by several years.

Thanks to the protective layer, the slate becomes smooth, atmospheric moisture is not retained on it, and snow and fallen leaves quickly disappear. The accumulated dirt can be easily washed off with a mini-washer for a car or with water under pressure from a garden hose.

In addition, painting solves another issue - the theoretical harmfulness of slate. This version is mainly distributed by manufacturers of advanced and expensive roofing materials. The essence of the problem is that the slate coating emits asbestos dust, which has a negative impact on the environment and human health. There are numerous rebuttals to this version. However, for those in doubt, there is an optimal solution - painting the slate, which will completely prevent the release of asbestos dust.

So, painting a slate roof allows you to:

• improve the appearance of the roof and give it the desired color;
• smooth out the roughness of the slate;
• prevent the formation of cracks;
• protect the material from the growth of vegetation on it;
• prevent dusting;
• increase the service life of the roofing material by 1.5 times.

Slate paint has to meet many requirements. The main selection criteria: resistance to temperature fluctuations, burnout and precipitation. An important indicator is the level of adhesion with asbestos cement.

For staining slate, the following groups of paintwork materials are used:

• acrylic enamels;
• alkyd;
• organosilicon;
• "Liquid plastic".

Most requested acrylic compounds... They are distinguished by rich tones of various levels of matte. Types of acrylic enamels: water-soluble or organic solvents.

Water-dispersed acrylic paint for slate has a number of advantages:

• lack of a pungent odor;
• fire and explosion proof thanks to the water base;
• does not emit toxic substances;
• in the process of application does not need a special solvent;
• drying speed - about 2 hours;
• formation of a waterproof film;
• the service life of the coating is 5 years.

• Alpina Dachfarbe (Caparol) is a green, brown or red enamel resistant to frost and weather conditions.
• "Roofing paint on slate" (Novbytkhim) - forms a matte coating, resistant to the development of microorganisms. Available in five colors.
• "Akvagel AK-1Sh" (Styrene) - paintwork material creates a smooth film on the slate, from which water quickly flows down. A distinctive feature is the simplicity of roof maintenance.

Latex paint- a kind of water-based acrylic paints and varnishes. It looks like a thick mastic, and after drying it transforms into a flexible, elastic film. This "rubber" coating does not crack, does not allow water to pass through and has excellent adhesion to slate. Of the colors, the most demanded paint for slate is acrylic 6005 (matte green), 5005 (matte blue) and 3009 (matte red-brown). Color nomenclature according to RAL.

Acrylic enamels based on organic solvents differ:

• higher strength than water-based paints;
• elasticity;
• high water-repellent characteristics;
• lightfastness;
• longer drying time - about ten hours;
• pungent odor;
• moderate toxicity and fire hazard.

Important! If the solvent-borne acrylic paint is too thick, then it must be diluted with the solvent that is part of the enamel. Painting work should be carried out away from open sources of flame, using personal protection.

Alkyd slate paints dry quickly and form an elastic film on the roofing material that is not prone to cracking. Additional advantages of alkyd enamel include:

• high adhesion with slate;
• good moisture resistance;
• resistance to natural phenomena;
• it is not necessary to prime the surface before painting;
• service life - at least 5 years.

Examples of high quality alkyd paint:

• "Quick-drying enamel" (Impulse) - fast drying (within 1 hour at an ambient temperature of 20 ° C), no pungent odor.
• "Enamel for roofs" (Empils) - the strength of the protective layer, 10 colors.

Silicone paints- the most durable and reliable option for painting the roof. Silicone gives the enamel elasticity. Some types of organosilicon paints can fill microcracks up to 2 mm thick.

Important! Silicone enamels are the best option for treating old roofs.

Qualitative characteristics of silicone paints:

• high elasticity;
• the possibility of performing the restoration of the roof and sealing cracks;
• fungicidal properties block the reproduction of microorganisms;
• excellent dirt and water repellency;
• silicones are fireproof and non-toxic;
• durability - service life up to 15 years.

Examples of high quality silicone enamels:

• "KO-slate" (Silicon polymer) - forms a deep color and durable coating, is produced in two basic colors with the possibility of tinting;
• "OS-5103K" (Silicon polymer) - used for decorative and protective painting of various building materials. Differs in increased resistance to chemical gases, alkaline and acidic environments. Due to these characteristics, the paint can be used in industrial enterprises.

Polymer paints on the surface of the material, they form a plastic film of matte or glossy texture.

Qualitative indicators of "liquid plastic":

• 100% moisture resistance - polymer film prevents moisture from seeping to the slate;
• drying speed;
• harmless to the environment and no fire hazard;
• resistance to UV rays;
• the possibility of applying silicone enamel without using a deep penetration primer;
• it is permissible to apply enamel in frosty weather (up to -10 ° C);
• durability - service life of about 15 years.

Good polymer paint options:

• Liquid Plastic (Denalt) is produced on a polyurethane-alkyd base, which gives the coating sufficient strength;
• PPG-1 (Komoil) contains polystyrene. During the drying process, a durable moisture-proof layer is formed.

Important! Polymer paints dry very quickly. Therefore, it is advisable to paint with a spray gun.

Step-by-step painting of slate with your own hands

Most often, slate is painted with acrylic paints. Therefore, we will analyze the order of work using this type of enamel.

Calculating the volume of paint

The consumption of paintwork materials depends on the area to be covered and the absorbency of the material. As a rule, for staining 1 sq.m. slate will be consumed about 300 gr. paints. To determine the total volume of the enamel, it is necessary to calculate the area of ​​the roof.

The procedure for calculating the area of ​​a gable roof:

1. Measure the length and width of the building. The data are taken taking into account the allowances for the cornices (about 50 cm).
2. Calculate using the formula: S = 2 * (a * b), where S is the required roof area, a is the length of the roof slope, b is the length of the roof.

The resulting value should be multiplied by the average enamel consumption. When determining the total volume of paint, it must be borne in mind that two layers will have to be applied for high-quality staining.

Surface preparation

The longest and most laborious stage is the preparation of the surface for painting. The set of activities includes:

Important! It is necessary to start applying paint to the slate only after the priming layer has dried - not less than 12 hours later.

Slate painting technology

In advance, it is advisable to prepare brushes of different sizes in order to properly process the ends, corners and hard-to-reach areas of the roof. The paint is applied in two layers - main and finishing.

Important! It is permissible to paint flat slate with a spray gun. When processing wavy material, it is better to refuse it - there is a risk of uneven staining.

The base coat is applied with special care, covering all areas from top to bottom. After that, the base coat must be left to dry completely and re-paint.

The finishing layer "evens out" the sharp transitions of paint and creates a solid, saturated color of the roof.

Features of painting new and old slate

It is better to paint the new slate "below" - before roofing. There is an opinion that the base layer should be applied on the ground, and the finishing layer after the installation of the slate. Supporters of this method argue their opinion about possible damage to the enamel when installing the sheets. However, many experts believe that the risk of peeling off the paint layer is associated, first of all, with the unprofessionalism of the workers and the complexity of the structure of the roof itself. It is much easier to paint over localized scratches at the top than to apply a full coat of paint.

Old slate is more difficult to process due to a number of factors:

1. Deterioration of the structure. The elements of the sheathing weaken and sag over time. Walking on the roof can lead to cracks in the slate.
2. Partial destruction of the roofing material. Before painting the old slate, you need to check it for defects. Replace defective sheets and repair minor breaks.
3. Changing the structure of the slate coating. Under the influence of precipitation and temperature changes, the material becomes loose - this creates a danger for workers who paint slate.
4. The need to clean the surface from accumulated dirt and various build-ups.

Thanks to modern painting materials, it will be possible to avoid the dullness and dullness of the slate. The main thing is to choose the right paint and adhere to the technological process, then the result will please for many years.

DIY slate painting: video

Years go by, and the appearance of the roofs of Russian houses is gradually changing; among them, it is less and less common to find options covered with inexpressive gray slate. But you should not discount this durable and inexpensive material. To make it look no worse than the newfangled roofing with a spectacular appearance, its "appearance" can be made more presentable.

Is it possible and why to paint?

Seeing slate in a boring gray color in our country has been accustomed to for a long time. Today, this color discourages people from buying such roofing, especially given the many alternatives available on the building materials market. But this does not mean that slate cannot be painted, giving it the missing gloss. There are paints that can be applied to flat or corrugated slate. The flat painted version will look great and expensive on the facade of the house, and the wavy version on the roof.

The use of paint is justified from the point of view of not only aesthetics, but also banal economy. This kind of roof improvement is possible, for example, in the case of a major overhaul. If you approach fixing the situation in this way, then the cost of updating will be low. This approach can also be used as a temporary measure in order to postpone the issue of a radical reconstruction of the roof for several years.

Dyeing also solves many other problems.

• The paint binds asbestos dust, which is harmful to human health. Facades and roofs “clad” in painted slate will be safe.
• Thanks to the applied paint, the waterproofing of the slate coating will improve, since the decorative layer fills microcracks and pores on the surface of the material.
• Moss will not grow on a painted roof, which is a common problem with slate. Fungus and various pests that find refuge on porous slate will also not be able to settle on a roof treated with paint. As a result, the service life of the roof will increase.

• Slate paint can be given any shade and achieve a harmonious combination with the color of the walls of the house.
• A layer of paint on the slate makes it smooth. Water flows down more easily from such a roof. Snow does not accumulate on it. Such a roof is easy to clean by properly spilling it from a hose.

The only problem that can be encountered is that the staining will have to be repeated periodically. And this is not a momentary affair. Although, on the other hand, without shifting the entire roof, you can "rejuvenate" it from time to time.

LKM selection

For finishing slate, the appropriate paintwork must be selected very carefully. It must be resistant to strong temperature changes, precipitation, not fade for a long time, have good adhesion to the surface of asbestos cement.

There are the following types of paints:

• acrylic;
• silicone;
• alkyd;
• liquid plastic.

Let's consider the advantages and disadvantages of each type.

Acrylic paint

It can be water-based and organic solvents. Possesses good waterproofing properties. When stained, it penetrates into the smallest depressions and cracks, preventing moss and fungus from multiplying in them. Does not burn, adheres well to the surface.

Has no unpleasant odor. But at the same time it can have an excessively liquid structure and leave streaks on the surface during staining. On the market you can find high-quality water-based acrylic paints of Russian, German, Finnish, Polish production.

Water-based acrylics include the so-called rubber paint. Unlike the usual composition, it is a mastic with a thick consistency. After drying, such paint turns into a film that resembles rubber in properties. It firmly adheres to the roofing surface, not allowing water to pass through and not cracking.

This paint does not burn, dries within a couple of hours. However, with all its merits, it cannot be called harmless. It is toxic, therefore, when dealing with it, you need to properly protect the skin and respiratory tract. On sale it is called “Rubber paint”.

The second group of acrylic paints contains a resin and a solvent, which is usually white spirit. Depending on the percentage of resin, the degree of haze of the composition changes. The more it is, the better the dried paint shines with a gloss.

This type of acrylic, in comparison with the water-based version, differs in that it forms a stronger film, better repels water, and is also more elastic and able to retain color for longer. At the same time, such paint has a very strong unpleasant odor, which creates discomfort in work. The choice of such paints and varnishes on the market is large. Among the well-known names, Russian-made "Shikril" is often mentioned.

Silicone paint

This variety is classified as the most durable and reliable for slate. Silicone makes the paint flexible. When stained, the composition penetrates into cracks to a depth of two millimeters.

During repairs, they are repaired with rather large damage on the roof. This paint does not allow various microorganisms to multiply on the roofing material, does not allow water and dirt to pass through. Non-toxic, fire safe. With it, the "lifetime" of the slate increases by about five years.

It adheres perfectly to the surface of the roofing material, but in ten to fifteen years it burns out strongly, losing its visual appeal. It should be borne in mind that the price of such a roofing paint is quite high.

"Liquid plastic"

This is a polymer paint, which, after hardening on the surface, turns, according to its own name, into a layer of plastic on the slate. Outwardly, it can look matte or glossy. "Liquid plastic" completely isolates the roofing material from water, dries quickly after application.

The paint is environmentally friendly, does not burn, does not fade, and is resistant to severe frosts. You can work with it at temperatures down to -10 degrees. Will last ten to fifteen years. The disadvantage of Liquid Plastic is that it is toxic. Requires skin and respiratory protection during application to the surface.

Alkyd paints

Created on the basis of alkyd resins and organic solvents. It dries quickly, creating an elastic film on the surface that does not crack. They adhere well to slate, reliably protect the roof from water.

Such paint also does not require preliminary priming. At the same time, the service life is short - only five years. There are good foreign and domestic alkyd paints on the market.

Usually green, red and brown colors are chosen for slate coloring., they are the most common, but sometimes you want something special. In such cases, tinting comes to the rescue - a process when the necessary shades are obtained by mixing pigments or paints. The tinting service is offered by paint companies. You can also achieve the desired color yourself. To do this, add tinting paste to the existing paint and stir using a mixer.

The success of painting a slate roof largely depends on the preliminary preparation for this process.

• In order for any chosen paint to hold firmly for many years, the slate plates must be thoroughly cleaned. All dirt can be removed with a wire brush. You will have to make a lot of effort to remove all dust, ingrained moss, old leaves and branches from the roof. It is necessary to undertake such work on a fine day. Wet slate is a rather fragile material, so it is better not to clean it after rain.
• With skillful use of the tool, you can use a grinder with a grinding attachment. In this case, it is important not to overdo it with pressure, otherwise the roof can be damaged. Working with such a tool will not speed up the process, but the quality of cleaning will be much higher.
• The easiest and fastest way to remove all the dirt from the roof is with water. It must be served under a pressure of 200 to 250 atmospheres. If the jet is weaker, not all the dirt will go away, and if it is stronger, the slate will break.

• Processing can be carried out with a brush, roller or spray gun. It will be useful to apply an antiseptic to the roof several times.
• After completing the procedure, the composition should be absorbed into the slate and dry.
• The next stage is surface treatment with a water-repellent composition, since water is exactly what negatively affects the porous structure of the slate coating in the first place.

• At the next stage of processing, a primer is applied. It makes the surface even, removing microcracks and roughness. In addition, if the priming is not carried out, the binder that is part of the paint will be absorbed into the porous slate, and the decorative coating will not be able to adhere firmly. In addition, thanks to the application of the primer, it will be easier to cover the slate with paint, its consumption will be less and it will lie smoother.

There are special primers, among which acrylics are considered the most effective. They penetrate deep layers of slate, strengthen the surface and fill the pores.

As a primer, you can also use the paint itself, which is planned to cover the roof surface.... It is diluted with a solvent. When treating the surface, such soil penetrates into the upper layers of the slate, fills in microcracks and pores. Thanks to this, the layer of ordinary paint adheres tightly to the base.

Priming can be carried out at +5 and +30 degrees. It takes about twelve hours for the primer to dry, after which the paint can be applied.

Coloring: features

You can do this work without involving a specialist, as they say, with your own hands. It is best to apply the paint in two layers, as folk craftsmen and professional finishers advise. One will be basic, and the second will be finishing. The base coat must thoroughly cover the entire roof or flat slate surface of the façade, including ends, corners and other structural details. This takes two thirds of the total volume of paint.

The second layer is applied after the first is dry. Thanks to him, the roof and walls get a uniform color. For work, you can use a brush or a spray gun. Experienced people do not advise using the roller, since in this case it is inconvenient. It is best to paint with a spray gun, but in the corners and joints you cannot do without a brush.

For such work, it is advisable to choose a warm and cloudy day that does not bode well for precipitation. It is important that the next one is the same. If it is humid or too hot outside, painting is not possible. On average, one square meter of area, provided that two layers of coating are applied, one hundred to two hundred grams of paint is consumed. But the material should be purchased with a margin in case of additional costs.

Now let's look at the nuances associated with staining different slate.

New

Obviously, when constructing a new slate covering, all work related to the restoration of beauty is best done on the ground. Experienced people advise to divide this process: apply the finishing layer of paint already on the roof, because during the installation of the roof, the pre-painted sheets of material can be scratched.

Although, again, everything will depend on the specific situation. If the roof area is small, the slope is not strong and real professionals got down to business, the risk of damaging the surface of the painted slate sheet is significantly reduced. Sometimes it is easier to do all the stages of paint treatment on the ground, and then fix the damage in certain places on the roof surface.

Old

With the old slate, the hassle will be much more. Often, when it comes to painting a roof that has been in use for many years, its very structure has already been weakened. Stepping on it, you can break the slate, or at least provoke the appearance of new cracks on it. Over the years, such roofing material becomes loose. So it can be dangerous to be on it.

Before work directly related to painting, you will have to carefully examine the surface of the roof. Longitudinal and transverse cracks and breaks appear on the old slate. Sometimes damaged roofing sheets are easier to replace, although they can be repaired.

In the modern construction market there is a huge selection of roofing materials, but, despite this, ordinary gray slate has not lost its popularity. This is explained by its good performance, resistance to temperature fluctuations in the external environment, long service life and low price.

Covered with slate in the last century, houses have faithfully serve their owners to this day, however, the roof surface, while maintaining its performance characteristics, has an unsightly appearance. The staining of the slate helps to correct the situation. Do-it-yourself slate painting is quite possible, you just need to know how to do it correctly.

Perhaps painting slate is an interesting and even enjoyable activity.

Why do people paint old slate

Slate painting allows you to get rid of these negative phenomena. People paint old slate for the following reasons:

• the release into the environment of finely dispersed asbestos particles harmful to health is reduced;
• waterproofing qualities are improved;
• increased resistance to temperature fluctuations in the external environment;
• the operational period is significantly increased;
• the development of pathogenic microflora is prevented;
• the painted surface has high decorative properties.

The painted roof is in good harmony with the color of the walls

Of course, it is easier and easier to paint at the stage of roofing installation. In this case, the slate can be painted on the ground and then installed in its place.

However, it often happens that the owners of private houses think about performing this procedure after several years of operation, when the surface that has turned green from moss absorbs moisture and creates an increased load on the rafter system. At the same time, green paint is very popular.

Preparing for painting is an important and no small job

An important stage in the work is preparing the surface for painting. This ultimately determines the long service life and high performance of the finish coat. All technological subtleties of the dyeing process should be observed.

Before starting work, the surface must be thoroughly cleaned. The simplest way to perform this manipulation, which does not require the use of special tools, is mechanical cleaning with a metal brush.

It is very convenient to clean slate with a high pressure car wash

Work should be done in dry weather, as the mechanical strength of a wet coating decreases. Cleaning in this way is time-consuming and physically demanding. A grinder or a drill with a brush installed on it allows you to reduce the physical effort to perform this work, but this requires a faithful eye and a steady hand in order not to damage the coating.

The surface is cleaned most quickly and efficiently with a high pressure water jet. Such devices are used for washing vehicles. The optimal pressure will be from two hundred to two hundred and fifty atmospheres, with a lower value, it will not be possible to qualitatively remove contamination, with a higher value, a directed water jet will break the coating.

When performing all manipulations, personal protective equipment for the respiratory and vision organs should be used, as asbestos dust will rise into the air. You need to work in a suit made of dense fabric, a respirator and glasses.

What paint and primer is better to paint the roof of the house

Before you start painting the slate surface with your own hands, it must be impregnated with a special compound that prevents the development of pathogenic microflora. Apply it with a wide brush, paint roller or spray gun. To ensure high-quality protection, antiseptic treatment is performed in several layers.

There are special primers for slate

Then a composition is applied to the coating to prevent moisture penetration. Due to the porous structure of the slate, its premature destruction occurs precisely from the aggressive action of water. After antiseptic and moisture-repellent treatment, a layer of primer is applied. It provides high-quality adhesion of the paint to the base and reduces its consumption. The primer should be purchased from the company that produced the main paint material, and should contain components that prevent the development of pathogenic microflora.

The paint and varnish material used for painting must resist well the aggressive effects of the external environment, heating by direct sunlight, and have water-repellent properties. Such qualities are possessed by acrylic and alkyd paints, coatings on polymer and silicone bases. Which one is better, we will figure it out a little later.

Staining is done in two layers, the first of which is the main one. You can apply paint with a paint roller, a wide brush or a spray gun. Of course, the slate surface is painted in dry, calm weather.

Acrylic paints

The most widely used are water-soluble acrylic compounds. They do not emit a strong odor and toxic substances, thanks to their water base, they do not ignite when exposed to an open flame, do not require the use of solvents and form a waterproof coating, which has a service life of about five years. Acrylic paint applied to the surface dries within sixty minutes. The disadvantage is the liquid consistency and streaks can form on the coating.

Slate paint options

Silicone based coatings

Silicone-based coatings are considered the most reliable and durable. Due to their high elasticity, they are able to fill rather deep cavities, they can be used without applying a primer layer. The silicone surface has high mechanical strength, excellent dirt and moisture repelling properties.

Filling the pores of the slate well, it prevents the development of pathogenic microflora in them. The material does not support the combustion process, does not emit harmful substances and an unpleasant odor into the environment. The service life of the coating is about fifteen years.

Alkyd paints

Alkyd paints are characterized by a short drying time, while forming a non-cracking elastic surface. They have excellent adhesion to the slate surface, high resistance to aggressive environmental influences and atmospheric moisture, and do not require priming of the base before application. Average service life is about five years.

Polymer-based coatings

Polymer-based coatings containing vinyl, polyurethane or polystyrene form a glossy or matte plastic layer upon application. It completely blocks the penetration of moisture to the slate surface, is inert to chemicals, does not fade from ultraviolet radiation, does not support the combustion process and is environmentally friendly.

Polymer-based coatings are well resistant to negative temperatures, application is possible without the obligatory priming. The period of operation is about fifteen years.

Choosing a color and tint

The most common colors for roofing surfaces are green, brown and red. However, the color palette offered by manufacturers of this type of product can consist of more than a hundred colors and shades. A do-it-yourself green slate roof is very common.

Roofing green is very popular

What to do if you want to paint the surface with a non-standard color, which is not in the company's catalog? Which color scheme should you choose? The desired shade can be created by adding tinting paste to the paint and stirring it well. Most companies provide for the possibility of tinting, that is, obtaining any tones of the color palette. When choosing a color, you must take into account the surrounding environment, while the green roof will be lost in a dense garden.

When finishing a slate roof with your own hands, you should heed the advice of craftsmen. In order to feel safe when working at height, a safety harness should be used. Cleaning, priming and painting of the surface must be carried out in a protective suit, goggles and a respirator.

If no spray gun is available, flattened slate should be painted with a paint roller, not a wide brush. To dry the first layer, you need to leave more time than indicated in the instructions, most often it considers ideal conditions that differ from reality.

You can paint slate even before installation or directly on the roof using a brush or a spray gun.

Before performing the work, you need to familiarize yourself with the weather forecast for several days in advance: the coating will last longer if it does not rain after the final stage. On a steep gable roof, it is best to work with an assistant. A high-quality painted surface of the roof will delight the owners with its appearance for many years, the coating will not peel off or crack over time.

Dear Reader! Your comments, suggestions or feedback will serve as a reward to the author of the material. Thank you for the attention!

The following video is carefully selected and will definitely help the perception of the above.

Asbestos slate is gradually losing its position in the building materials market. The reason is its nondescript appearance. In this article, we will consider the topic - how to paint a slate roof, what paint to make this roofing material presentable. Topics will be discussed regarding the advantages of painted slate roofing, as well as the types of paints with which roof structures covered with slate are painted today.

Source kbumb.ru

Why do you need to paint slate roofs

The first reason is indicated - nondescript. It is difficult to keep up with slate in terms of design for ondulin, corrugated board, metal tile and other roofing coverings. There is only one way out - to cover it with paint. This will not affect the cost of the roof structure, because slate is the cheapest material. Having painted it, one cannot talk about high costs for paint per 1 m 2.

In addition, the paints and varnishes with which slate roofs are painted today are not in short supply, their variety is quite wide, so there will be no problems with the choice. The staining process itself is simple. One worker is enough for a team of craftsmen to paint the roof of a large house.

The second reason is protective. Slate is a porous material. Over time, microcracks form on its surface. It is probably not worth explaining what this is fraught with. But we must pay attention to the following point. In winter, water penetrates into cracks, where it freezes. The ice simply tears apart the asbestos fibers, thus reducing the strength of the material itself.

The same applies to the process when mosses and lichens grow on the slate. With their roots, they penetrate deeply into the slate body, expanding and deepening the cracks.

Source ms.decorexpro.com

Therefore, painting is a protective layer that will not only become a barrier to water, but also an insurmountable obstacle for plants. The dried paint film formed on the slate is very durable. In any case, she will be able to deal with the above loads for several years. This means that a roof covered with slate will last longer.

The third reason is the harmfulness of asbestos. Several decades ago, propaganda against slate began in the West. It also moved to Russia, supported by manufacturers of more expensive building materials. Although it has long been proven that this is just propaganda to enable other roofing materials to be present and sold on the market. But if this aspect haunts you, then with the help of paint you will solve this problem.

So, to summarize, than painted slate is better than unpainted:

Increase decorativeness roofing structure.

Using a certain type of paint, you can give slate haze or gloss.

Make surface smooth without pores and cracks.

Do not give the opportunity to grow mosses and lichens.

Install protection from the appearance of asbestos dust.

Increase lifetime... The dyed material will last 1.5 times longer.

Source hi.decorexpro.com

Types of slate paints

The roof, even covered with paint, requires special treatment. All known natural loads act on it, therefore, the choice of paint must be approached especially. That is, it must withstand the sun's rays, changes in humidity and temperature, and mechanical stress. Moreover, it should adhere well to asbestos-cement slate.

That is, it is impossible to paint the slate with any paint that came to hand first. Here is a list of suitable paints:

acrylic;

silicone;

alkyd;

enamels called "Liquid Plastic".

Let's take a look at each variety separately and determine their technical characteristics, as well as the pros and cons.

Acrylic paints

This is the most extensive line of paints and varnishes with intense color and varying degrees of gloss (from highly glossy to highly matte). This category of paintwork materials is divided into two groups:

water based, they are also water-dispersive;

based organic solvents.

Group # 1

Composition: latexes, they are also acrylic copolymers, pure water, pigments and various additives that improve the quality of paint (antifreeze, biocides, etc.). It should be noted that the percentage of water in the paint is not more than 15%. It acts as a diluent and solvent.

Source kbumb.ru

Here are the advantages of an acrylic water-borne material:

this is eco-friendly material which, under the influence of natural loads, does not emit harmful substances into the atmosphere;

high adhesion to any building materials, including slate;

high hiding power, in the range of 200-300 ml / m 2;

ease of application;

steadiness to atmospheric precipitation;

this is non toxic material;

high fire resistance because the base is water;

not necessary add chemical solvents;

dries up within 1-2 hours;

the paint layer increases frost resistance slate;

increases waterproofing properties roofing material;

service life - 5 years.

In the group of water-dispersible acrylic paints there is a subgroup called "rubber". These are all the same components, only the structure of the material is thick mastic. It is applied to the roof in a thin layer, which, after drying, forms an elastic flexible film, very similar to rubber. Hence, in principle, the name.

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The film is not only elastic, but also very durable. At the same time, it well closes cracks up to 1 mm wide, preventing them from expanding later. The mastic has high adhesion to porous surfaces. And it is one hundred percent waterproofing coating. It is represented on the market by a fairly wide assortment. Available in cans and buckets with the words "Rubber paint" on them.

Group no. 2

Acrylic slate roofing paint of this type is not diluted with water. For this, organic solvents are used, white spirit is more often used. There are also matte and glossy paints, which differ from each other in the amount of acrylic resin introduced into the composition. The higher its percentage, the higher the gloss of the material.

How does this variety differ about water dispersion:

colorful film applied to the slate stronger;

above water repellent specifications;

increased elasticity coverings;

for a long time keeps original color.

The disadvantages include a pungent smell, which gradually disappears, a little more consumption - 250-350 ml / m 2, drying time is longer - within 10-24 hours. You can also add here not the widest assortment on the modern market.

Source blues-dev.ru

Silicone paints

Silicone paints are composed of pigments and organosilicon binders, which impart special strength and elasticity to the paintwork material. Therefore, silicone-based paints are rightfully considered reliable and durable coatings, and not only for slate. Only they can close cracks up to 2 mm wide.

So, what are the advantages of this type of paintwork:

increased strength applied layer;

maximum possible elasticity;

add to the paint supplements that prevent the formation of colonies of harmful microorganisms on the roofs;

high waterproofing quality;

high dirt-repellent properties;

silicone paints can be applied to the slate of the latter;

high fire safety;

this is non-toxic material;

life time within 10-15 years.

The only drawback that should be noted is the high price in comparison with other types.

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Alkyd paints

Ingredients: alkyd resin, pigments and organic solvent. It should be noted right away that this type of paint and varnish products belongs to the category of quick-drying. After 30-90 minutes, the paint dries completely. The applied layer is flexible enough. Cracks do not form on it during the entire service life. And the term is not the longest - only 5 years. Although for the roof, this is a normal indicator.

To the advantages of alkyd paints we add high moisture resistance, good adhesion, ease of application. Using them, there is no need to cover the slate roof with primers. And one more important plus, which was highlighted by many masters, is the ability to tint white alkyd paint.

Video description

The video shows the process of dyeing slate:

Polymer paints

"Liquid plastic" got its name for a reason. It contains suspensions of various polymers. It can be PVC (polyvinyl chloride), polystyrene or polyurethane. Each of them is the main paint and varnish product. This also includes pigments, additives that improve the quality of the paint, and thinner. It turns out that after applying the paint and varnish layer, the solvent evaporates from it, and the polymer dries and hardens, forming a thin layer of plastic on the slate roof. In this case, the surface can be either glossy or matte.

The advantages of this material:

absolute moisture resistance;

dries up within half an hour;

one hundred percent environmental friendliness;

material inert to chemistry;

plastic - material incombustible;

you can apply paint without preliminary priming;

does not lose their design qualities under the influence of sunlight, atmospheric precipitation and wind;

highest frost resistance, you can apply beauty to slate even at a temperature of -10C;

life time- 10-15 years old.

So, we examined those types of paints and varnishes that answer the question posed by the topic of the article - how to paint the slate on the roof. Now let's move on to the section on how to paint a slate roof correctly.

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Slate painting technology

It should be noted right away that even the most expensive and high-quality paint chosen for the decoration of slate laid on the roof is not a guarantee that the applied coating will withstand its assigned service life. The most important point is a competently carried out painting process. It is divided into several stages, the sequence of which must be strictly followed.

Stage 1

First of all, the slate laid on the roof must be prepared. That is, the slate roof is being cleaned. This is done in three ways:

Mechanical... To do this, use scrapers, brooms, brooms, brushes and other hand-held identical tools and devices. With their help, dust, dirt, debris, small vegetation are removed from the slate surface.

Hydraulic... For this, a high-pressure water jet is used. You will need a long hose, nozzle, pump and a container with water (you can connect the pump to the water supply network).

Combined... They combine the two previous methods, which is more effective, especially when an old slate coating is being prepared for painting.

Source blues-dev.ru

Stage 2

At this stage, the roofing material is primed. Usually it is selected according to the technical characteristics of the paint. It is better if the primer and paint are from the same manufacturer. As mentioned above, some slate paints can be installed without priming.

If a primer is necessary, then it is applied to the slate with brushes, rollers or a spray gun. The latter option is simpler and more convenient to apply, and more economical. It is better to apply the primer in two layers, taking into account that the first one dries well before applying the second.

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Stage 3

This process is no different from priming. It is carried out with the same instruments. The material is applied in two layers, the first must be dried before applying the second. The first layer is considered basic. With its help, all irregularities and defects of the roofing material are closed. Therefore, it is very important to paint the joints, corners, slate ends, as well as ridge and pediment elements.

The second layer is already finishing (paint). It is with its help that the color design of the roofing structure is created. It is this layer that creates a bright uniform color; it should not have streaks and smudges on it.

Video description

The video shows how easy it is to paint the slate on the roof with a brush:

Conclusion on the topic

So, we sorted out the topic - how to paint the old slate on the roof, and how to do it correctly. As you can see, there are a lot of paints with which you can paint a slate roofing structure. Each has its own pros and cons, but they all have the same quality - they tolerate natural stress well. This means that slate roofs painted with these paints will delight you for many years.

Slate is considered one of the best materials suitable for roof installation. This inexpensive material is resistant to corrosion and adverse effects of climatic conditions, easy to install and repair. It can be used without applying paint, however, it looks much more beautiful in a painted state. Today we will dwell in more detail on the painting process itself, and also consider how to paint the old slate on the roof in order to extend its service life.

Why paint slate

This question arises, almost for everyone who is faced with the process of painting the roof.
Painting the slate is necessary to give it the desired color. However, in addition to this, this procedure carries other equally significant functions.
This type of roof belongs to porous materials, which means that its integrity is quite easy to break. In the cracks formed when the integrity of the coating is broken, water easily gets into, turning into ice with the onset of winter, which "breaks" its fibers. In addition to water, slate can also be destroyed by spore plants growing on it.
Some roofing materials can be prevented from premature aging by painting them. The paint covers the surface of the material with a durable film that does not allow moisture and microorganisms to pass through, which significantly increases its useful life.
The dyed slate is easy to wash and clean. In addition, paint reduces the likelihood of asbestos dust emission - hypotheses about its health benefits can often be heard from Western manufacturers of more expensive and modern roofing.
Slate painting allows:

• give it a bright color;
• significantly smooth its surface;
• protect the roof from the appearance of spore plants on it;
• prevent the formation of cracks;
• avoid dusting it;
• significantly extend its service life.

With the purpose of painting, everything is now clear, but what kind of coloring agents can be used to paint a slate roof and can they be applied without preliminary preparation? Let's figure it out further.

Types of slate paints

What can you paint slate with? This question is necessarily puzzled by the one who decides to update his roof with staining.
Slate paint is selected especially carefully, since it should help it withstand the effects of various climatic conditions, such as humidity, temperature changes, and others. In addition, the coloring agent must adhere well to this type of roof. When getting started, you can purchase one of the following coatings.

Acrylic paints

Presented in the widest range. Their characteristic difference is a rich, bright color. All acrylic paints are divided into two groups:

1. Water-dispersive, which include latex, pure water, as well as additional components that increase the quality characteristics. In this case, water plays the role of a diluent or solvent. The percentage of her presence in the composition is about 15.
   Paints of this group:

• easy to apply;
• environmentally friendly;
• have high adhesion;
• not poisonous;
• resistant to the influence of negative atmospheric factors;
• do not belong to flammable substances;
• do not require the addition of chemical solvents;
• dry quickly;
• improve the waterproofing properties of the roof.

Among the slate coloring agents included in this group, the subgroup "rubber" is distinguished separately. Materials of this subgroup are identical in composition to other water-based paints, however, in their structure they are more similar to thick mastic. They are applied in a thin layer, which, when dry, forms a film resembling rubber. Due to its high strength, it is able to prevent moisture from entering the roof, protecting it from expanding existing cracks. Slate painted with such paint can serve for a very long time.

• Paints and varnishes made using organic solvents differ from each other in the specific proportion of acrylic resin included in their composition. They have the following distinctive properties:
  • form a high-strength film;
  • moisture resistance
  • increased elasticity of the coating;
  • the ability to maintain color for a sufficiently long period.

  The disadvantages of these materials include their strong, pungent odor, long drying and not too wide range.

Silicone paints

They are considered one of the most durable coatings that can close cracks of 2 mm.
The advantages of these paints and varnishes include:

• unique strength;
• high elasticity;
• the possibility of introducing protective additives that prevent the formation of harmful microorganisms in the roof;
• resistance to moisture and dirt;
• the ability to use without priming surfaces;
• non-toxicity;
• non-flammability.

The only drawback of silicone paints is their high cost.

Alkyd paints

They contain alkyd resin, coloring pigments and organic solvent. This paint dries quickly, forming an elastic layer that can protect the roof from cracking for a long time.
Its advantages include:

• resistance to moisture;
• high adhesion;
• ease of use;
• the possibility of tinting.

Polymer paints

Their second name is “liquid plastic”. They got it because of the polymers they contain. In addition to polymers, they include pigments, quality-enhancing additives and solvents. After the paint is applied to the roof, the polymer present in it hardens, forming a thin layer of plastic.
The advantages of polymer paints are:

• their moisture resistance;
• fast drying;
• environmental friendliness;
• inertness to chemistry;
• incombustibility;
• the ability to paint them without applying a primer;
• resistance to the influence of various atmospheric factors and low temperatures.

Having considered all the suitable coloring materials, we will pay attention to the coloring process itself.

Surface preparation

If you need to paint an old slate that has already been lying on the roof for some time, then this is allowed only after preliminary preparation.
First, the roof should be cleaned of dirt, fungus, moss and all cracks in it should be repaired. Small cracks are "patched" with a cloth, pre-impregnating it with waterproof glue. Large fractures are filled with mastic from a mixture of loose asbestos, PVA glue and cement.
If there are a lot of cracks and chips on the roof, it will be pointless to paint it without preliminary repair. In such a situation, it is best to first replace the roof and, only after that, paint. In this case, it will be enough to change only the sheets that are out of order.
Slate can be cleaned manually or using a high-pressure washer.
It is difficult to manually clean the roof. Even using a brush for these purposes may not give the desired result. To simplify the process, the brush can be replaced with an electric drill with a special attachment, however, in this case there is a risk of damaging the material itself.
It is easier to clean the roof using a sink, the main thing is to choose the right water pressure, which will remove dirt and will not damage the slate. In this case, it is better to set a pressure of 200-250 atmospheres.
After cleaning, the roof is disinfected with an antiseptic.
Before painting the cleaned slate, it should be primed. The application of the primer is carried out at a temperature not lower than 5 and not higher than 30 degrees. Then, the composition is allowed to dry for 12 hours and begin to stain.

The slate should be painted by applying two layers of paint and always after the primer has completely dried:

• The first layer - base layer - covers the entire roof surface, including corner joints, joints and ridge.
• The second layer - finishing - is applied after the first layer has completely dried. It gives the slate an even, uniform color.

Conclusion

Can a slate roof be painted? Based on the foregoing, we can conclude that it is not only possible, but also necessary. Moreover, painting slate on the roof is a process that requires a thorough approach and mandatory preliminary preparation associated with the selection of the correct paint and cleaning the roof from contamination. One should not also forget about the primer, which is indispensable when using most paints. And finally, the coloring itself. How to paint the slate is up to you. The main thing is to paint the roof in two layers in order to thoroughly paint over all its elements.
Using this technology will give your roof a color and appearance that will allow it to compete with a roof made of tiles, bitumen or metal and significantly extend its service life.