Paint the slate roof in the country house. Paint for slate: how and what is better to paint slate. Should I paint

Slate, even in an unpainted state, is a material that is sufficiently resistant to negative external influences.

It is characterized by low price, resistance to corrosion and ease of installation and repair.

But painting the slate significantly increases its operational potential, although it requires additional costs and time. In this article, we will analyze what paint to paint the slate on the roof and how to do it correctly.

The main disadvantage of slate is the possibility of growth of mosses and algae on it. The activity of plants leads to an increase in the size of the pores and the appearance of microcracks, which reduces the operational potential of the roof. The growth of mosses also negatively affects the appearance of the roof.

Another disadvantage of slate is its fading over time. The material peels off, the original structure of the coating is broken.

Proper painting of the slate roof can eliminate these shortcomings. It will increase its moisture-proof properties and give it a pleasant appearance, will prevent peeling of the material, the appearance of mosses and fungi on it.

Asbestos is considered a carcinogen hazardous to health. From unpainted slate, asbestos dust constantly emanates into the atmosphere and poisons it., painting the material allows you to minimize this process and make the roof more environmentally friendly.

Initially painted slate can also be purchased from the manufacturer, but this is not as economical as doing this process on your own.

Paint Functions

Paint for slate - how to choose the best paint for the sheet?

Asbestos fibers are not compatible with all types of paints. Least of all, oil and enamel products are applicable for arranging a slate roof.. Simple enamel begins to flake off and hang down within a few months after application, but specialized enamels are actively used for arranging slate roofs.

How to paint slate? In addition to specialized enamels for coloring slate, the following types of products are used:

Acrylic. Belongs to the group of water-dispersion products, which are characterized by a high degree of waterproofing. Acrylic fills even the smallest holes in the slate and prevents the reproduction of fungi and plants in them. The paint is represented by such brands as Akrilakma, Triora, Novbytkhim.
modified acrylate.
silicone paints. Extend the life of the slate by an average of 5 years. They have good adhesion (adhesion to the roof surface). The main disadvantages are that they have a high price and completely burn out on the sunny side of the roof in 10-15 years.
Acrylic silicone products. They combine the best qualities of both types of paints. Manufacturers: Penta, Sofexil.
polyurethane products.
Liquid plastic. High-tech material, characterized by low price and high resistance to mechanical and atmospheric influences. But liquid plastic is toxic, which increases the need for caution when installing it.

One of the best materials in terms of price, quality, ease and safety of coloring is acrylic.

Surface preparation

If the slate has already been used for a certain time, then it is impossible start painting it without preparatory procedures.

It is necessary to clean it from accumulated plants, fungi, dust and asbestos chips.- the paint will not be applied properly to the uncleaned slate.

All cracks and breaks should also be repaired.

Small cracks are sealed with a cloth impregnated with waterproof glue. Larger breaks should be filled with loose asbestos mastic, PVA glue and cement.

NOTE!

If the roof is covered with large and numerous cracks, large pieces of material break off from it, then there is no point in painting it, it is better to purchase and install a new slate. It is not necessary to install a new design from scratch, it is enough just to replace the sheets that have become unusable.

You can clean the slate both manually with a stiff brush for metal, and with a sink that creates a jet of water with strong pressure. The first option is very time consuming, cleaning the roof with a brush can take several days, and a good result will not be guaranteed, since not all formations can be removed manually.
Instead of a brush, you can use an electric drill with a special nozzle, the disadvantage of this method is the risk of damaging the slate with such a rough tool.
Cleaning with a sink is easier and faster, but it is important to choose the right water pressure. Too low a pressure will not be enough to remove germinated plants, if it is too high, the jet can damage the slate. The optimum pressure is 200-250 atmospheres.
After cleaning the roof, it must be disinfected. Antiseptics are used for this purpose. They are applied over the entire surface of the roof with a brush or sprayer, the second option is more preferable.

CAREFULLY!

All preparatory work performed in a respirator and goggles to prevent asbestos chips and cleaning materials from getting into Airways and eyes.

The last stage of preparation is the primer. It improves the adhesion of paint and roofing material. It should be applied with a roller or brush over the entire area of slate. Some types of primers are additionally antiseptics.

Asbestos cement has a high permeability, so almost any primer is suitable for it. It should be applied at an air temperature of 5 to 30 degrees above zero. The average drying time of the primer is 12 hours, after this period you can start painting.

Slate cleaning

How to paint slate with your own hands

Craftsmen's advice recommends painting slate in two layers. The first layer is the main one, 2/3 of the materials are spent on it. The interval between applying layers is from one to two hours.

Slate painting is carried out with the help of brushes and spray guns. Spray guns speed up the process, make it more convenient. But to work out the corners and others hard-to-reach places on slate sheets you need to manually brush.

Most best time for painting - these are warm and moderately cloudy days.

At low or high temperatures air, with its high humidity or under the scorching sun, work will be impossible. It is desirable that the weather be favorable the next day after their completion.

Average paint consumption per square meter with two-layer application is 100-200 grams, but you should always buy materials for the future, since situations are not ruled out when their additional consumption is required. Paint should be applied from top to bottom.

If the result of two-layer painting is not satisfactory, then Additional coats may be applied until the finish is smooth and pleasing to the eye.

Applying paint to new slate is relatively easy, as work can be done on the ground before the sheets are installed on the roofing pie. If the slate sheets are in an inclined position, then achieve their uniform filling paintwork materials it will be hard.

If the slate is painted on the ground, then when climbing to the roof, its coating can be scratched. To avoid this, only the first layer of paint is applied to the roofing cake before installation, and the second layer is applied after the installation of the roof is completed - it hides the scratches that have appeared.

Slate is the most popular roofing material, although it loses to others in decorative properties, and natural grey colour, over time, under the influence of precipitation, it darkens, which makes the roof nondescript, moreover, she starts to break down.

To make the service life as long as possible, painting slate roof thus protecting it and giving the house an original look.

In the latter case, the result will also be positive, but additional work will have to be done.

Since the slate is made of asbestos and concrete, its structure is somewhat similar to drywall and concrete slabs, so all painting work is carried out in the same way. It is recommended to use the following types of paint:

acrylic;
Polymer;
Solvent paint for slate.

Only these solutions will help give the roof new aesthetic look and at the same time, protect it from the harmful effects of ultraviolet radiation and precipitation.

Slate surface needed clean thoroughly with the help of metal brushes from growths of moss and dirt, if necessary, rinse with water, if there are holes in the roof, then these areas should be replaced, and if there are small cracks, they are sealed with cement.

After the roof surface has dried, apply each next one after the previous one has dried, and then apply the paint. It is better to paint with an ordinary brush or sprayer, in three layers.

Since the roof, including slate, constantly takes on any weather phenomena, and this is not only precipitation in the form of rain or snow, but also hard ultraviolet radiation, it must be securely protected.

Previously used for this purpose Oil paint, which is why the positive effect was minimal and such a coating could withstand only a few seasons. Now, homeowners are offered a variety of solutions, with wide colors, allowing you to protect the slate for a period of five years or more.

Most of them are performed acrylic or silicone based, such as organosilicon paint "KO-slate", the composition includes various fillers and dye. After drying, it forms a durable coating that is resistant to damage, and also prevents the removal of asbestos particles into the atmosphere.

One of the most famous - paint "Triora" on acrylic basis, is applied in two or three layers, while it is possible to select a shade by tinting.

Tikkurila coating - based on a modified acrylate dispersion, this brand considered the most expensive, however, the resulting coating is able to maintain elasticity even at very low temperatures.

Slate can last a long time and even if it is covered with moss and blackened, it can be painted, giving the building and roofing in particular, a completely new look.

by the most ideal option there would be painting of slate sheets on the ground, followed by installation at the top, but this is only possible if carried out overhaul roof structures, in other cases, painting is carried out, being directly on the roof.

Slate should be cleaned of dirt with a metal brush, if necessary, rinse with a spray gun, pay special attention to the places where the nails pass, since if the fasteners are with homemade washers and without rubber gaskets, then a lot of debris and dust accumulate there.

The roof should be carefully examined for cracks or holes, if any, fragment will need to be replaced and cracks are repaired with cement plaster.

After preparing the surface, it must be primed in three layers special composition applying the next layer after the previous one has dried. The paint is applied with a spray gun for large roof areas or with a wide square brush for smaller areas.

Also watch an interesting video clip about painting slate

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

Houses covered with slate in the last century still serve their owners faithfully, but the roof surface, while maintaining performance, has an unsightly appearance. Coloring slate helps to correct the situation. Painting slate with your own hands is quite possible, you just need to know how to do it right.

Perhaps painting slate is an interesting and even enjoyable activity.

Why do people paint old slate

Painting slate allows you to get rid of these negative phenomena. people paint old slate the following reasons:

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

Painted roof harmonizes well with the color of the walls

Of course, it is easier and easier to paint at the stage of installation of the roofing. In this case, the slate can be painted on the surface of the earth 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 moss-green surface absorbs moisture and creates an increased load on truss system. At the same time, green paint is very popular.

Preparation for painting is an important and considerable work.

An important step in the performance of work is the preparation of the surface for painting. Ultimately, this results in a long service life and high performance. finish coat. All technological subtleties of the staining process should be observed.

Before starting work, the surface must be thoroughly cleaned. Most in a simple way performing this manipulation, which does not require the use of special tools, is mechanical cleaning with a metal brush.

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

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

The surface is cleaned most quickly and effectively with a jet of water supplied under high pressure. 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 remove pollution qualitatively, with a higher value, a directed water jet will break through the coating.

When performing all manipulations, individual respiratory and eye protection 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 goggles.

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

Before you start painting the surface of the slate with your own hands, it must be impregnated with a special composition 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 that prevents the penetration of moisture. Due to the porous structure of slate, its premature destruction occurs precisely from the aggressive action of water. After antiseptic and moisture-repellent treatment, a primer layer is applied. It provides high-quality adhesion of paint to the base and reduces its consumption. The primer should be purchased from the company that produced the main paint material, and it should contain components that prevent the development of pathogenic microflora.

The paint-and-lacquer material used for painting must resist the aggressive effects of the external environment, heat from direct sunlight, and have water-repellent properties. Acrylic and alkyd paints, polymer and silicone based coatings. Which one is better, we'll figure it out a little later.

Coloring is performed in two layers, the first of which is the main one. You can apply the paint with a paint roller, a wide brush or a spray gun. Of course, painting the surface of the slate is carried out in dry calm weather.

Acrylic paints

The most widely used water-soluble acrylic compositions. They do not emit pungent odors and toxic substances, due to the water basis, do not ignite when exposed to an open flame, do not need the use of solvents and form a waterproof coating, the service life of which is about five years. The acrylic paint applied to the surface dries within sixty minutes. The disadvantage is the liquid consistency, and stains 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. Silicone surface has high mechanical strength, excellent properties to repel dirt and moisture.

Well filling the pores of slate, it prevents the development of pathogenic microflora in them. The material does not support the combustion process, does not emit harmful substances And bad smell 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 an elastic surface that is not subject to cracking. They have excellent adhesion to the slate surface, high resistance to aggressive environmental influences and atmospheric moisture, and do not require mandatory priming of the base before application. The average service life is about five years.

Polymer based coatings

Polymer-based coatings, which include vinyl, polyurethane or polystyrene, form a glossy or matte plastic layer when applied. It completely blocks the penetration of moisture to the surface of the slate, is inert to the effects chemical substances, 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 mandatory priming. The period of operation is about fifteen years.

Choose color and color

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

Green color roofing is very popular

What to do if you want to paint the surface with a non-standard color that is not in the company's catalog? What color to 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. color palette. When choosing a color, one must take into account the surroundings, while the green roof will be lost in a dense garden.

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

If a spray gun is not available, flat surface slates should be painted with a paint roller rather than 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 with a brush or spray

Before performing 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 better to work together with an assistant. A well-painted roof surface 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 your attention!

The following video is carefully selected and will certainly help the perception of the foregoing.

Painting the slate on the roof will make the coating look attractive and protect it from the external environment. Today you will learn how to paint a slate roof and how to do it right.

In the video in this article you can see a lot useful information and do quality work.

Why paint slate

Slate has been one of the most popular roofing materials for houses and buildings for a long period of time. Such fame is easily explained by its affordable pricing and long service life.

To date, flat slate, like wave slate, is often used in the construction of various structures. But like everyone construction material, it has not only advantages, but also a number of disadvantages.

For example:

Slate does not have an aesthetic appearance, which does not allow it to be classified as decorative or elite building materials. It is destroyed in an aggressive environment. Under the influence of moisture, it can become overgrown with lichens or mosses.
To cope with a number of such problems, as a rule, timely painting of the roof helps. Such application of coloring compositions can be done by hand. The layer that is formed during painting protects the asbestos cement from the effects of wind, preventing it from weathering, and does not allow it to undergo biological degradation.
In order for the life of such a roof to be longer, it is necessary to treat the slate roof with special protective solutions, and only after that with paint. But, in fact, such measures can be carried out not only when the slate is new, but also when it has already acquired a black color and the process of its destruction will begin.
In order to protect the roofing and prepare for painting, the following measures should be taken:
removal of moss and lichens from the roof.
Cleaning it from dirt and dust particles.
Treatment with antiseptic compounds and water repellent.
Roofing primer.
Painting it twice with drying between the layers of applying paint and varnish products
If the slate is prepared correctly, then the paintwork lays down in an even layer, does not chip off, does not lag behind, which protects against external environmental influences, but also gives a presentable appearance to the building.

Attention: Painting a slate roof will also eliminate a number of shortcomings.

Roof painting rules

How to paint slate roof now let's look at it in detail. If you do everything yourself, then the price of the work will not be significant.

Roof cleaning

Before deciding how to paint a slate roof, you need to understand the principle of coating. After all, technology is important here, otherwise the coating will not hold.

So:

If asbestos cement lies on the roof for more than one season, it is best not only to sweep the material from debris and wipe it, but also to remove the moss and lichen that have grown on it. Most often they spread on the slopes of the roof.
A stiff brush will help to cope with growths, but processing should be carried out exclusively on a dry roof surface. Of course, you can clean with your hands, but a grinder with a stiff wire brush attachment will help optimize the process. You can buy it at any hardware store.
If you use a power tool in your work, it will facilitate your work, increase speed and improve the quality of cleaning roofing material. After all the slopes are cleaned, the coating on top must be swept with a regular brush, and then rinsed. warm water and let dry before moving on to the next step.
Those places that are difficult to reach and cannot be cleaned are rubbed with a hard brush by hand with a grinder, very carefully so as not to damage the coating.
The slate can be cleaned with a high pressure water jet. This method can only be used with special equipment. With this cleaning method, you can perform the procedure in any weather, regardless of precipitation, the main thing is that the air temperature is above zero.
Before cleaning, you should choose the right pressure, it should not exceed more than 250 atmospheres. If it is higher, it can adversely affect the slate and lead to destruction. But it is worth considering that the water pressure should not be weak, otherwise it simply does not eliminate moss and lichens on the roof.

Slate roof processing

Before coating asbestos-cement material with paints and varnishes, it is necessary to carry out a number of procedures that will increase its resistance to an aggressive external environment.

Asbestos-cement slate roofs have been used in construction for decades, and slate is the most common roofing material in Russia. Asbestos cement is an artificial stone material obtained as a result of hardening of an aqueous mixture of Portland cement and finely fluffed chrysotile asbestos fibers reinforcing the cement component.

Asbestos-cement products have high mechanical strength in bending, low density, low thermal conductivity and water permeability, high frost resistance, resistance to alkalis, and are also characterized by sufficient biostability. The strength limit of asbestos-cement slate sheet: in tension - 20 ... 25 MPa, in bending - 27 ... 42 MPa, in compression - 45 MPa or more.

Slate roof protection - slate processing

The disadvantages of asbestos cement include: reduced strength when saturated with water, brittleness and warping with changes in humidity, poor impact resistance.

How and how to process slate so that it does not turn green and black?

In order to get rid of these shortcomings, waterproof compositions are applied to the surface of asbestos-cement products, which protect the material from moisture, mechanical damage, provide good water flow and do not trap dust.

To do this, a sheet of asbestos cement is dried to 7 ... 6% moisture content, after which its surface is cleaned of dirt, primed and finally painted with weather- and waterproof paint compositions.

By the way, to increase water resistance and reduce the release of asbestos dust, which causes specific diseases, the back side of the product is also primed.

The coloring of slate sheets with perchlorovinyl compounds (PVC, TsPHV, HV-161) is carried out at a temperature not higher than +4°C (due to the toxicity of the compounds) and not lower than -20°C.

To do this, first, a perchlorovinyl primer is applied to the surface of the sheet, which dries out in 2–3 hours in summer conditions.

The dried surface is painted with perchlorovinyl compounds using a paint spray gun (preferably brand SO-71A). At mechanized way coloring composition in order to avoid its stratification must be systematically mixed in the paint pressure tank. During operation, the distance from the gun to the surface to be painted must be at least 0.5 m, the gun should be moved along the surface evenly, at a speed of about 0.3 m/s.

Slate is painted in stripes. The first strip is applied from top to bottom, the second - to the right of the first, but from the bottom up, the third, like the first, and so on. To obtain a continuous coating (without gaps), it is necessary that each subsequent strip overlaps the previously applied one by 3 ... 4 cm. Usually, two layers of the composition are applied to the slate, and the second layer is sprayed only after the first one dries.

When painting twice with PVC composition, per 100 m² of surface are consumed (kg):

PVC paint - 59;

Primer PVC - 15;

Solvent (solvent; R-4; 5% PVC varnish) - 10.

When applying a ready-to-use cement-perchlorovinyl composition (CPCV) per 100 m² of surface, 41 kg of the composition is consumed for the first painting, and 36 kg for the second.

Slate surfaces are also treated with KO-174 enamel, which is a dispersed system (suspension) consisting of a solid phase (fillers) and a liquid phase (organosilicon KO-85 varnish diluted with a solvent - a mixture of butyl acetate, acetone, xylene and toluene).

As a result of evaporation of the solvent, the enamel hardens. The drying time of the enamel at a temperature of 18...25°C is about 2 hours. The enamel has good adhesion, so it adheres reliably to asbestos-cement sheets, and the enamel coating is characterized by high strength and water resistance.

The thickened enamel is diluted with R-5 thinner. Before painting with enamel, the surface is prepared in the same way as before painting with perchlorovinyl compounds. Slate must be dried before painting, as its moisture content should not exceed 8%.

Enamel is applied 2-3 times with a paint brush or paint sprayer. Each subsequent layer is applied 1-2 hours after the previous one. Please note that enamel is toxic, so it is used only for outdoor use.

Slate is also covered with organo-silicate compounds. One of the most durable compositions is the OS-12-03 composition, which consists of the paint itself (suspension of organosilicon polymers and inorganic additives in toluene) and a hardener - polybutyl titanate or butyl titanate.

Before use, a hardener is added to the coloring composition in an amount of 1% by weight of the paint and the composition is thoroughly mixed in a container for 1 hour using a nozzle with blades. The paint hardens as a result of a chemical reaction between the components. Xylene or toluene is used as a solvent. The coating has good adhesion and holds securely on concrete, cement, silicate brick, ceramics and metal (with the exception of halogen-containing plastics).

On slate and metal roofs, the organo-silicate composition is applied at temperatures from -40°C to +40°C, using a flywheel paint brush, roller or paint sprayer.

The composition dries quickly - in 30 minutes. The "vitality" of the composition prepared for application is 24 ... 48 hours. With a two-layer coating of asbestos-cement or concrete surfaces with a brush, up to 400 g of the composition per 1 m² is consumed. Of course, the composition is applied to the surface, previously cleaned of dust, lubricating oils, sprayed with mortar.

When working with a paint sprayer, a nozzle with a diameter of 1.8 ... 2 mm is used and a round torch is formed from the paint.

In the process of applying the paint, it is thoroughly mixed by hand.

Slate asbestos-cement sheets are also painted with silicate paints prepared on the basis of potassium soluble glass (K2O mSiO2) with a density of 1.3 ... 1.5 g / cm³. Silicate paints also contain a mixture of pigments and chalk supplied separately, taken in a ratio of 1:1 (by weight).

The value m is the ratio of the number of silica molecules (SiO2) to the number of alkaline oxide molecules (K2O) and is called the silicate modulus of glass. For potassium glass, m is 3…4. The higher the modulus, the higher the quality of liquid glass.

The density of glass depends on its concentration. Often liquid glass comes from a manufacturer of increased density, so it has to be diluted with water.

How to paint a slate roof: technology

The required amount of water is calculated by the formula:

U1=U2(p1-p2)/(p2-1000),

where U1 is the amount of water to be added to the solution, l;

U2 - initial volume of liquid glass, l;

p1 and p2 - the initial and required density of liquid glass according to the hydrometer, kg / m³.

There are 10 liters of liquid glass with a density of 1500 kg/m³. It is necessary to obtain a solution with a density of 1370 kg / m³. It is required to determine the amount of water U1 to be added to the solution. The amount of water added is:

U1=10*(1500-1370)/(1370-1000)=3.5 l.

Before use, the composition is strained through a mesh No. 0.25 containing 694 holes / cm².

Silicate paints are made only with alkali-resistant pigments and they have fire-retardant properties. It is impossible to prepare the paint composition for future use, since it becomes unsuitable for further use in a day.

For silicate paints, only potassium glass may be used, since the presence of soda glass (Na2O mSiO2) causes a white coating, the so-called efflorescence, to appear on the painted surface.

Therefore, before using silicate paints, it is necessary to check their quality, that is, to establish that they do not contain sodium soluble glass.

To do this, take a red clay brick, five sides of which are painted twice with the tested paint. After the paint film is completely dry, the “experimental” brick is moistened with water until completely saturated and placed on the unpainted side. If there is an admixture of sodium glass in soluble glass, then after 1-2 days white coating and the paint will begin to "shallow" when rubbed by hand.

The priming of the slate surface before painting is carried out with liquid glass with a density of 1.41 g / cm³, while the consumption of liquid potassium glass is 27.3 kg per 100 m².

The first painting is carried out with a composition with a density of 1.14 g / cm³, the second - 1.18 g / cm³. The consumption of liquid potassium glass (per 100 m²) during the first coloring is 14.8 kg, during the second - 11.1 kg. Let's not forget about the dry pigment mixture, which will require 30.9 kg for the first coloring, and 26.6 kg for the second.

Asbestos-cement slate sheets are painted in warm weather (at positive temperatures), avoiding painting in direct sunlight.

To impart water-repellent properties to the applied film, hydrophobic additives, organosilicon liquids (GKZH-10 and GKZH-11), are introduced into the silicate compositions intended for the second coloring. They do it like this. Diluted liquid potassium glass (density 1.15 g/cm³) is loaded into the mixer, then poured required amount pigments and mix the components until homogeneous, where they add GKZH-10 or GKZH-11 (commercial 30% concentration).

The consumption of hydrophobic additives is 2.3 kg per the amount of liquid potassium glass required to cover 100 m² of slate.

Of the anhydrous compositions for painting asbestos-cement slate sheets, the following brands of paints are used:

White lead white (MA-011; MA-011-N-1; MA-011-N-2),

Zinc whitewash (MA-011; MA-011V; MA-011N; MA-011NV),

Oil paints (MA-011 and MA-015; special thickened),

Colored oil and alkyd paints (MA-011; MA-015; GF-013; PF-014),

Ready-to-use oil and alkyd paints (MA-11; MANN; MA-15; MA-15N; GF-13; GF-13N; PF-14; PF-14N; MA-21; MA-21N; MA-22; MA-22N; MA-25; MA-25N),

Thick lead greens (MA-011-N-2; MA-011-N-3; MA-015-N-2; MA-015-N-3),

Oil and alkyd paints, earthen, thick-ground paints (red lead, mummy, ocher).

All types of primers and the above waterless paint compositions for exterior coatings are prepared only on natural drying oil and diluted only with natural drying oil!

Coloring is carried out in the manner described above. Prior to coating asbestos-cement slate surfaces protective composition it is necessary to carry out preparatory work to clean them from dust, soot, dry and prime the slate.

I repeat, it is not allowed to paint in dry and hot weather when exposed to direct sun rays, as well as during rain or on a damp surface, do not work in strong winds.

Most auspicious time years for painting asbestos-cement roofing - spring months. Painting work is carried out using special ladders-ladders, which evenly distribute the weight of a person over the surface of asbestos-cement slate surfaces, which excludes their damage.

All materials of the section "Repair and construction"

How to paint slate?

1.Characteristics of slate as roofing

2. Slate roof repair

3. Roof cleaning

4. Elimination of cracks and replacement of sheets

5. Slate painting

Such roofing material as slate is always popular and regardless of the appearance of new coatings on the market.

It differs not only in its reliability, but also in its affordability. Slate painting is carried out in order to increase the operational life of this roofing coating. Therefore, it is worth understanding how to paint slate and how to paint slate on the roof, as well as how to repair the roof. Detailed Instructions with photos and videos of this process, if desired, can be easily found on our website.

Characteristics of slate as a roof covering

This material, which at one time was made using shale, is one of the oldest materials of a kind. Of course, such slate natural slate is quite difficult to find today, partly due to the fact that it has an incredibly high price (read: Installation of a slate roof - laying methods).

However, an artificial version of such a coating - flat or wavy asbestos-cement sheets - is very widespread today.

Nowadays, other roofing materials are also offered that have some relation to slate, for example, euroslate, which is based on bitumen (read: “Euroslate - reviews and main characteristics”), metal slate, etc.

But asbestos cement slate, nevertheless, is still the most popular example of roofing.

The main advantages of slate:

do-it-yourself slate roof is easy to do;
low level of thermal conductivity;
resistance to low temperatures and atmospheric phenomena;
affordability;
Fire safety.

Slate roofing, by definition, is reliable.

This is especially true for roofs where painted slate is used, since the protective film created by paint for slate helps to increase the resistance of slate to various mechanical and natural influences, therefore, the operational life of the roof is extended.

In addition, slate is a completely repairable material. So, if any cracks or defects appear on the slate sheets, then there is absolutely no need to redo the entire roof, even if a significant part of the material is completely destroyed.

It will be enough just to replace the damaged sheets, given the size of the slate that was previously used.

What and how to paint flat slate? Overview of market offerings + step by step instructions

In the case when painted slate is used, there is absolutely no danger to health, since thanks to the paint, not only the reliability of the roof increases, but also the release of dust, which contains asbestos particles, stops.

Slate roof repair

No matter how mobile and convenient the slate is to repair, if any defects appear, repairs still need to be done, and the sooner the better.

Usually repair work consist of three stages:

roof cleaning;
elimination of cracks or, if necessary, replacement of sheets;
slate painting.

Do-it-yourself repair of a slate roof with strict observance of the rules of all three stages will allow the roof to last for decades.

Roof cleaning

Usually, if the roofing material is painted slate, then cleaning the roof will not present any difficulty, it will only be necessary to sweep out all the debris that has accumulated on it.

If the slate sheets are not painted, then this can lead to the appearance of moss and lichen on them, which, of course, cannot positively affect both the appearance of the roof and its operational properties.

One of the tools used to clean the roof is a brush equipped with metal bristles. The work can be simplified by using a drill with a nozzle like a wire brush.

Ordinary water, which is supplied under pressure, can also clean the slate well.

The compact portable car washes used for cars are perfect here.

Elimination of cracks and replacement of sheets

The basis for the repair of relatively small cracks in slate can be mastic, the basis of which is bitumen or a special putty made using chalk and drying oil.

A special composition for repairing cracks may also consist of the following elements:

2 cement parts;
3 asbestos parts;
PVA glue diluted in a ratio of 1/1 with water or undiluted water-based paint frost resistant.

Liquid elements must be selected in such a volume that the final composition has the consistency of a thick paste.

Due to the rapid solidification, these compositions must be prepared in small portions.

Another option for sealing wide cracks is to stick fabric patches on them.

In this case, the desired place is primed, and then a patch is applied to a thick layer of paint, the size of which should be over size cracks 10 cm. Next, the patch needs to be covered with an additional layer of paint.

The replacement of damaged slate sheets also belongs to the same stage of repair. To do this, special walkways are mounted on both sides of such a sheet, for which ridge brackets serve as fasteners. To move along the roof during repairs, in this case, a wide board is placed across these bridges, on which, if necessary, you can walk.

Nails and screws on the desired sheets must either be completely removed or loosened. If nails are removed with a nail puller, it is important to place a piece of wood under the tool.

The desired sheet, that is, the one to be replaced, must be lifted and a new one laid in its place. It should be located along the edge of the floor and move towards the ridge. The newly installed sheet is fixed with screws or nails.

Slate painting

All professionals agree that painting slate is not only possible, but also necessary, as this significantly improves the properties of the roof and prolongs its service life.

An important factor is the aesthetic appearance of the painted roof.

Therefore, painting slate with your own hands may well be done, a more difficult question will be how to paint flat slate. Previously, standard oil paint was used for this, despite all the negative nuances of this method (fragility, tendency to rapid destruction).

Nowadays, special paints and varnishes are becoming more widespread, which are suitable for painting not only slate, but also tiles, concrete, etc. The basis of such paints is acrylic, due to which these compounds are resistant to low temperatures, sun radiation and precipitation.

This, of course, has a positive effect on the aesthetic appearance of the roof, which will remain so for a long time.

When deciding how to paint slate, you can choose a special paint for slate, called triora. It is resistant to external influences, in addition, it can be used for both slate and tiles, and even to cover the basement of a building.

There are other paints made by both domestic and foreign manufacturers (read: “How to paint a slate roof: technology”).

It is quite possible to paint slate with your own hands, that is, without the participation of professionals. Of course, the best option will paint the slate sheets even before they are laid, but this will not work during repairs, so it will be necessary to apply paint on already laid sheets.

3 stages of slate painting:

soil is applied;
the main coating is applied;
final coating is applied.

The tool for painting can be a spray gun or a paint brush.

Flat slate can also be painted with a roller, size flat slate this allows.

Before applying the primer to the slate, it will be correct to treat the coating with an antiseptic solution, which is most often sold in concentrated form and diluted with water before use.

The use of such a solution will not allow a fungus or lichen to appear on the slate. It can be applied both with a wide brush and with any device capable of spraying liquid. It is important to remember about protective equipment - glasses, gloves, a respirator.

A slate primer can then be applied, which often contains acrylic liquid formulations that can penetrate deep into the pores of the coating, thereby giving it greater durability and better adhesion of the slate to the paint.

Painting slate on the roof, look at the video:

Very often, the primer of certain manufacturers is offered together with the paint, so it would be better to opt for the same brand. Apply primer in the same way as paint: you can do it with a spray or roller.

Due to the fact that slate is a porous material, painting it without a primer will be uneven, which will necessarily lead to paint overspending.

After the primer has dried, you can begin to apply the main coat of paint. It is very important at the same time to apply it well on all corners and ends of the coating.

The final coating is designed to give the slate roof a beautiful appearance.

It helps to make the surface uniform and homogeneous, without visual transitions and paint streaks. You can apply this layer only after the main one has dried.

The paint for the final coating is the same as for the main one, the difference is only in its smaller amount.

The last stage requires about one third of the total volume of paint, and the base coat - two thirds.

So, painting slate can be done with your own hands. This will provide an excellent opportunity to save a significant part of the finances, since the services of professional craftsmen are usually not very cheap.