What paint is best for the iron roof of a house. How to choose paint for an iron roof at home

Any private house has a roof. It can be made from almost any material. But each of them becomes less attractive over time and loses its quality characteristics. Painting the roof of your home will protect it and increase its service life.

Each coating has its own nuances of decorating it with paint, as well as different types of compositions used for these purposes. This article will discuss dyeing technologies and provide advice on how to carry out the work.

Painting a slate roof

Slate is the most common material for roofing. It basically does not need additional protection, except that a layer of paint will prevent moss from growing on the surface, and it is painted for decorative reasons. Grey colour does not look very presentable, especially among houses that are covered modern materials bright colors.

Preparing for coloring

If the roof is already covered with slate, then it must be carefully prepared before painting. The main preparation procedure is to clean the roof surface from various debris and oil stains using a hard metal brush. After the debris is removed, you need to thoroughly rinse the roof with water from a hose with good pressure and let it dry.

Important! Removal greasy stains produced with gasoline or solvent.

If there is no visible damage to the roof, then you can immediately proceed to the primer. But if found small cracks and chips, they are treated with a mixture of PVA glue with the addition of cement and asbestos and dried thoroughly.

If the slate is attached to the roof with nails and rust has formed on their heads, then it must be removed.

To improve the adhesion of paint and material, slate is better Cover with a layer of primer and proceed to painting after it has dried.

Roof painting

To paint a material such as slate with your own hands, you need to use a special paint that is suitable specifically for this material. It can be water-dispersed, which can give slate roofing an incredible appearance and protect it from exposure to precipitation. Manufacturers offer special water-dispersion paint for slate.

The next alternative is enamel, which will create a durable glossy film on the slate surface that can protect against various types influences. In addition to it, there is rubber paint, which will adhere as firmly as possible and protect the slate.

It is best to paint the roof with a roller, but as a rule, slate is made in the form of corrugated sheets, so a roller will not help here. In this situation, you can use a sprayer or a brush with stiff bristles, which evenly paints the entire roof area, starting from the top. It is more convenient to paint row by row.

Painting a galvanized metal roof

This coating is the most common due to its quality properties, which make the roof resistant to various types of external influences.

Preparation of material

Also, as in the previous case, it is necessary to carry out certain steps to prepare the metal roof for painting. If the roof has already been painted, then you will need a sufficient amount of chemical-based remover and harsh abrasive tools to remove the old layer. You will also need to remove traces of rust and debris that is on the roof.

Rust is removed by replacing some of the roofing elements or by cleaning using chemical-based rust converters. The substance must be applied in a thin layer to a cleaned and completely degreased surface and wait for it to take effect. The drying cycle of the substance is about 5 days; you can work with the surface only after this time has elapsed.

Important! Work with this substance should only be done with gloves and safety glasses.

It is worth remembering that a metal roof can rust not only from the outside, but also from the inside, to a greater extent this applies to the areas that are located between the sheathing bars. Work must also be carried out to get rid of rust inside the roof to avoid its spread further.

After cleaning, you can begin priming the surface, which is carried out with special compounds that are marked with the purpose of their use.

It is quite important to know how much paint is needed to treat the roof. This is necessary so as not to make a mistake with its quantity and buy exactly the quantity that is required. To do this, the roof is measured and its area is calculated, and then the results obtained are compared with the volume of paint material. Usually the paint consumption is indicated on the container, but it is worth taking a little more than the indicators in case of unforeseen situations.

Staining procedure

To paint a galvanized roof, you should choose a dry day with an air temperature of at least +5 degrees and humidity not higher than 80%. To prevent bubbles from appearing on the roof, you need to maintain its temperature at 50 degrees Celsius. On hot days summer days a metal roof can be extremely hot, so it should be painted on a cloudy day without precipitation and in the evening or morning.

Before applying the composition, it must be thoroughly mixed in one container until smooth and such actions must be carried out periodically during painting.

Important! You should not dilute the roofing paint, as it will lose all its properties.

First of all, it is necessary to paint the slopes of the roof, and only then go from the ridge to them, shading the composition over the surface.

One layer of paint for a roof is not always enough, so usually the roof is painted in 2 layers. But the application is repeated only after the first layer has completely dried, and this is after about a week.

The roof can be painted in any color that matches overall design home or makes it stand out from other buildings nearby. Usually dark colors are used, such as brown and dark green, but what is stopping you from decorating the street with a bright, cheerful roof. You can also create original color transitions directly on the roof; it all depends only on the imagination of the owner of the house.

Before you start painting the roof, you need to familiarize yourself with the basic recommendations that will simplify the painting process and help you avoid some mistakes:

• The best time to choose the time to paint the roof is between the spring months of April and May, as well as the autumn months of September and October. According to professionals and their practice, this coating lasts longer.
• It is better not to carry out work in summer, since the temperature for painting work on the roof is extremely unsuitable.
• It is prohibited to paint the roof during rain.
• When working on the roof, you should wear shoes with rubber soles to reduce slipping.
• When painting the roof, be sure to be fastened to a safety rope that ties it to the rafters or beam.

Important! The pipe for tying the safety rope is not suitable, as it will not be able to withstand the weight of a person’s body and will collapse.

• The paint for the first layer should be more liquid than for subsequent ones.
• Coloring drainpipes carried out after their removal and cleaning.
• In addition to the outer surface of the metal roof, you also need to paint the inner surface using a brush.

Conclusion

Painting the roof, be it slate or metal, is very desirable in order to avoid problems during operation, since the paint forms a special layer that can protect against external influences and increase the service life of the roof. But each roofing material is painted with its own composition and according to a certain technology for preparing and carrying out work. Therefore, before purchasing and carrying out repairs, you need to take into account all the recommendations and choose the right one yourself. paint material and tools for its application.

Roof painting is necessary measure protection of the roofing material from the effects of precipitation, solar radiation, and harmful chemical emissions.

Figure 1. Roof painting is necessary to protect the roof from precipitation, sunlight and chemical emissions.

The second most important factor is the appearance of the roof. The renewed roof, emitting a pleasant light, pleases the eye, and the house under it loses its ordinariness, acquiring the new kind(Fig. 1).

Roofing material and fastening methods

IN different times were used various materials for arranging roofs. Metal roofing can be classified according to the material used for its manufacture:

• black metal;
• galvanized iron;
• non-ferrous metals - copper, zinc.

Non-metallic roofing materials include corrugated slate.

The main method of constructing roofs from metal sheets was to connect the vertical joints of the sheets with seams. On one side of the sheet, the edge was bent at a right angle, with an arc in the shape of the letter L. When laying, the edges of adjacent sheets were overlapped and compressed with a special tool or using two hammers. This connection ensured the tightness of the joints. The roof was attached to the sheathing with nails with spacers and wide heads.

One non-metallic material that is becoming a thing of the past is corrugated slate. Roofs made of this material were very popular. The slate was attached to the sheathing special nails. Ferrous metal is a mild steel with good ductility properties. The metal composition does not contain elements that protect against corrosion or slow down its process. Roofing made from this material must be painted.

Galvanized iron appeared on the market building materials a little bit later. Zinc coating provides satisfactory roof protection for a certain period of time. It is quite difficult to ensure high-quality roofing without damaging the coating, especially when making seam connections. During long periods of operation under the influence external conditions the coating begins to deteriorate. Painting the roof of a house significantly extends the life of the roof. When installing a new roof made of galvanized sheets, it is advisable to paint it 2-3 months after completion of the work. During this time, a film of zinc oxides forms on the surface, improving adhesion to the paint.

Roofs made of non-ferrous metals are quite rare. Copper is resistant to corrosion and has a wonderful appearance. When constructing a roof made of copper sheets, artificial aging is used. Naturally, the roof acquires the appropriate appearance within 15-30 years of operation. Treatment chemical materials turns new roof to the old one in a few hours.

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Choosing the Type of Paint for Metal Roofs

When choosing roof paint, you need to keep the following in mind: the optimal period between repairs when good quality The paint must be at least 5-6 years old, so the issue of choosing paint must be treated with due attention. The paint must have the maximum set of properties that can provide long-term protection for the house and roof. The main properties of the paint are:

When choosing roof paint, you need to pay special attention to the level of corrosion protection.

• maximum level of corrosion protection;
• high resistance to temperature changes and precipitation.

The coating must be elastic, since the metal has significant thermal expansion. Oil and alkyd paints were commonly used. Coating with these compounds provided roof protection for 2-3 years. With further use, the paint turned into a hard, hard layer, which was destroyed by thermal expansion and mechanical impact. The coating was covered with a network of cracks, and moisture penetrated into the cracks. Periodic transitions of moisture from solid to liquid state and vice versa, they further expanded the network of cracks. Over the course of a short period of use, the coating became unusable and it became necessary to paint the roof.

Water-based paints are also unsuitable for protecting metal roofs - the water they contain contributes to the corrosion process. The best option Roof paintings are industrial paints for covering metal with additives to protect against corrosion. The coating of such paints has good density , high adhesion to metal surfaces, time-stable elasticity. To all of the above positive qualities

You can add one more thing - fire safety. The cost of acrylic paints is considerable, but if you paint the roof with them, the service life increases significantly. When purchasing a profile metal sheet made of ferrous or galvanized metal and processing acrylic paint

You can get an analogue of metal tiles at a cost several times lower. Acrylic paints are resistant to solar radiation, precipitation in in various forms

, thermal expansion of the metal.

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No surface primer is required when using this type of paint.

Preparatory work before painting Before you start painting the roof, you need to carefully inspect the entire surface of the roof, clean it of dust and dirt. It is necessary to remove the old coating and rust. Use mechanical methods

removal must be done extremely carefully so as not to damage the roof. If the roof is leaky, you can use in the following way : cut a piece of tarpaulin or fiberglass required size

, soak it in primer, cover the problem area with primer, lay the piece down, and smooth it out. After drying, you can start painting. It is advisable to use a solvent and chemical rust converters. You can paint the roof after all processes are completed. The processing time is indicated in the instructions from the manufacturer (usually about five days). Coating repairs need to be done not only from the outside, but also inside . The metal surface pressed to the sheathing by fastening elements is usually in good condition

. It is necessary to inspect and treat the surfaces between the sheathing boards. If there are traces of oxidation, they must be processed in a similar sequence. Many building roofs are covered with metal sheets. For such There are several reasons: low cost, durability, ease of installation and good appearance. However, for normal operation of the roofing, additional waterproofing is required. In this article we will look at how to choose paint for a metal roof and how to apply it.

On final decision how to paint metal roof influenced by the type of roofing. To avoid making mistakes in the paint material, carefully read the following points.

Galvanized sheet

This is the most common type of roofing material in construction. Galvanizing helps protect steel from water, and therefore corrosion. However, no matter how thick the protective layer is, it becomes thinner over time and becomes unusable. Therefore, several years after installation, the roof has to be painted.

A year after installing the galvanized roof, you can begin painting. There is no need for special surface preparation, since chemical reagents are removed during the winter, and in the spring the rain washes away all the dirt. Before applying paint, all that remains is to treat the surface with an alkaline solution.

It is allowed to use classic oil, acrylic and special paints and varnishes. The latter include the following:

1. Fire retardant. Special metal paint Polistil helps protect the surface from natural weather conditions and fire. Usually it is painted in cases where there are many chimneys on the roof and ventilation ducts . Still, the cost of the composition exceeds classic options
2. , and it is used very rarely. Alkyd-urethane mixture

designed specifically for painting rusty roofs. In addition to its main task, protecting the surface from negative factors, paint helps curb the spread of corrosion.

The use of alkyd coatings on galvanized surfaces is prohibited. The fact is that after painting the protective layer will peel off from the tin and all the work will have to be repeated.

Black metal

Some roofs are covered with metal sheets without protection. They require painting immediately after installation, since after a year, under the influence of moisture, they will become covered with rust. Even if there is no rain, pure metal will begin to oxidize simply from the moisture in the atmosphere. If you miss the moment, then you will have to spend more time and money on the work.

1. As a rule, in such a situation the following compositions are used: This composition for the iron roof of a house came to us from the distant past, but is still in demand. Due to low elasticity, the paint product looks good only immediately after painting. After some time it fades, begins to crack and burst. Therefore, it must be updated at least once every two years.
2. Alkyd paints. A more expensive option, featuring a large palette. Unfortunately, the main drawback remains. Low elasticity leads to the fact that when thermal expansion The metal layer of paint becomes unusable. In addition, it is negatively affected sunlight. As with oil paints, alkyd paints require painting the iron roof every 2-3 years.
3. Acrylic paints. More modern version, devoid of classic flaws. Anti-corrosion chemical additives were added to its composition. The applied material withstands the effects of active ultraviolet rays. If the paint application technology is followed, the service life is 10 years. Although this option is more expensive than the previous ones, it is definitely more profitable in the long run.

There are special alkyd compositions, for example, Zinga conductive paint. This paint product is 96% zinc and replaces conventional metal processing. This coating does not require any special application technology. It protects against all types of threats and can last for several years without losing its properties. It turns out that a metal roof coated with this alkyd composition is more reliable than factory treatment.

It is prohibited to paint an iron roof with water-dispersion compositions, since the moisture contained in them will lead to corrosion of the roofing.

Choosing a paint application tool

The usual tools are suitable for painting: brushes, rollers and pneumatic sprayers. If you prefer brushes, then it is recommended to choose products with stiff bristles. The diameter of the main part of the product should be 60-65 millimeters; such a tool will last longer than usual. Experts advise having horsehair brushes with you; they are used in situations where you need to remove stains.

A paint roller will help increase labor productivity. It is worth remembering that it can only be used on smooth roofing coverings. Buy dismountable tools, as the paint surface will wear out over time and will need to be replaced. You can further increase productivity by attaching a long handle.

Even when choosing a tool, you need to be picky. Most often, paint rollers, brushes and air sprayers are produced on the local market, the share is about 85%. But some brands are imported from Poland, Turkey and Germany. The following brands are particularly reliable in operation: Lova-Paint-Roller (Czech Republic), Anza (Sweden), Schuller (Austria), Aqua-Seal (Germany).

Instead of a pneumatic spray gun, you can use an old vacuum cleaner with a spray function. All that remains is to buy a special attachment and assemble everything. For small roofs, a manual spray gun assembled in Belarus is suitable. It has a low cost, but is reliable enough for such work.

When painting a metal roof, wear shoes with felt soles. This option slips less on smooth surfaces and does not spoil a fresh coat of paint.

By choosing a quality tool and good paint cannot be applied efficiently protective covering without surface preparation. Therefore, before painting the iron roof, clean it of dirt and oxides. Treat the entire surface with alkaline solutions in two or three passes, starting at the bottom and working up to the ridge. If you covered the roof with alkyd paint, then avoid walking on the surface for several weeks. Only in this case can the quality of the work performed be guaranteed.

Metal roofs have become quite widespread due to a number of advantages: reliability, simplicity of construction, affordable cost and attractive appearance. But often the surface requires additional protection against corrosion, and then the question of how to paint an iron roof becomes very, very relevant. We will look at how to choose the optimal paint and ensure the most high quality works

Features of paint selection

Consideration of the question of how to paint an iron roof should begin with determining the type of base that needs to be treated. This is what influences the choice of a particular option, so we will pay special attention to this factor.

Black metal

This group includes all metal roofing sheets that are not coated with any protective coating. That is, the surface is pure metal, but it is not protected by anything and very quickly becomes covered with rust. Such a roof must be painted without fail, because it is better to process clean metal than to paint a rusty roof after a year, spending much more effort and money.

The main compositions used in this case:

• Oil paint- Very old version, which previously had no alternatives, and to which many have become accustomed. But such a coating does not provide adequate durability: the roof looks great, but after a year cracks appear on the surface, and the color begins to fade. All this is due to the low elasticity of the material, and if you choose it, be prepared to repeat the coloring at least once every two years.
• Alkyd compositions- another traditional option, its price is slightly higher than that of oil paints, but the quality of the cover is much better. This group of compositions is distinguished by its rich color scheme, but due to weak resistance to ultraviolet radiation staining will also have to be repeated every 2-3 years. The coating is also not elastic enough, which reduces its reliability during sudden changes in temperature.
• Acrylic compositions appeared relatively recently, but have gained wide popularity among developers due to a number of advantages: it contains anti-corrosion additives, which significantly improves protective properties coating, the surface is resistant to ultraviolet radiation, this ensures high durability. once every 10 years, which is why it is chosen by those who work with their own hands and do not want to repeat painting too often.

• Zinga electrically conductive paint is very interesting solution, because this composition is an analogue of cold galvanizing and consists of 96% zinc. The instructions for its use are simple, but the result is a coating that is practically not inferior to factory galvanized coating, which is resistant to almost any adverse weather influences: from scorching sun to sharp changes temperatures

Galvanized sheet

This is one of the most popular and sought after options if we're talking about about metal roofing. And this is not without reason - galvanizing makes steel resistant to moisture, but the layer is very thin, and it is not surprising that over time it no longer protects the metal, and corrosion processes begin. This is why painting is necessary; it will not only protect the roof, but also make it much more attractive.

Advice! Experts came to the conclusion that the best way preparation is natural aging: after installation, the roof is left for a year, moisture removes chemical reagents remaining after treatment, and rain cleans the surface. It is enough to wash the roof with an alkaline solution, and you can start painting.

For paints, you can use oil compositions, acrylic paints and compositions, in addition, there are special paints that are worth considering separately:

• Fire-retardant paints for metal Polistil are perfect for protecting the surface from the adverse effects of the atmosphere and will serve as a barrier against the effects of fire. This is especially important if there are many chimneys and ventilation shafts on the roof. But the cost of this option is quite high, and using it on the roof is most often unjustified.
• If you are faced with the question of how to paint an old iron roof, when the zinc layer has practically disappeared and the surface is covered with so-called white rust - a powdery coating, then it is best to choose alkyd-urethane paint. It will not only reliably protect the surface, but also prevent further spread of corrosion.

Note! This paint has the highest operational properties, but its cost is quite high.

Important! Never use alkyd compounds on galvanized surfaces. The alkaline reaction will oxidize the composition, it will peel off from the surface, and you will have to do all the work again.

Important Notes

Choice quality composition does not guarantee excellent results.

It is important to remember the following nuances:

• The surface must be cleaned of oxides and contaminants. If you are preparing galvanization, you should not be too zealous; along with the dirt, you can also remove the zinc layer.
• Before painting, the surface should be washed with an alkaline solution.
• The treatment should be carried out from top to bottom, optimally applying 2-3 layers.
• Remember that acrylic compounds gain strength over several weeks, so it is not recommended to move on the surface during this period.

Conclusion

In fact, choosing the right option is quite simple; it is important to take into account all the features of the roof and not skimp on quality, otherwise the work will have to be done again ().

The video in this article will help you better understand some of the issues discussed in this topic.

Often on country houses a metal roof is being installed. To ensure that it is protected from harmful effects external environment and increasing its service life, the metal is coated with paint.

But not any paint can be used to paint an iron roof, so it often arises as to which paint and varnish material would be better for painting in order to improve the quality characteristics and improve the appearance of the roof.

Metal Roofing Material Options

A variety of materials can be used to make a metal roof, including galvanized steel, ferrous and non-ferrous metals.

Ferrous metal is a mild steel that can be easily installed on a roof. This material does not contain substances that can protect against corrosion, so such a roof must be painted as soon as possible.

The roof is often covered with galvanized iron. Zinc coating helps protect the roof from external influences long time. But it is impossible to carefully install the coating on the roof without violating the integrity of the zinc coating, so after a while such a roof begins to slowly deteriorate as the zinc coating is destroyed. This is why you need to paint the roof after installing the roof after some time, usually 2–3 months. During this time, the zinc will have time to create a kind of film on the metal surface, which will improve the adhesion of the metal to the paint.

Roofs made of non-ferrous metals are not very common, but they look just great, and besides, copper is not subject to corrosion. To improve decorative qualities, copper sheets on the roof are specially aged. IN normal conditions aging occurs after 30 years of operation, and with the help artificial aging you can achieve the desired effect very quickly.

Arguments for painting a metal roof

In any case, a metal roof is one of the most reliable and durable roofing structures. Developers have long loved metal finish for its ease of maintenance, resistance to fire, and resistance to external influences, be it atmospheric or mechanical. Metal is also able to reflect the sun's rays, which is very good on hot summer days when it is difficult to hide from direct sunlight.

Metal roofs are more expensive than others alternative options coatings, but their cost is fully recouped by long-term operation that does not require repairs. While other roofing materials require repairs every 15-20 years, metal can go without it for 60 years.

Since the roof is constantly exposed to various factors, such as temperature changes, oxygen, precipitation, exhaust gases, dust, sand and others, the roof needs protection. The role of this protection is to cover it with paint and varnish solutions.

After 20 years of operation, the roof may become covered with gray streaks and subsequently rust. That is why it is better to prevent the development of such negative consequences and cover the roof with paint.

The fact that a metal roof is painted is also supported by the fact that it looks much more presentable than one that is not painted. A roof without a coat of paint looks unfinished.

At the moment there is a huge selection of paint and varnish products for external roofing works, from which you can choose the appropriate shade. Metal roofing coated with industrial-type acrylic paint.

Important! Galvanized roofing should under no circumstances be coated with alkyd compounds, as the material will lose adhesion and the paint will peel off.

Choosing paint for a metal roof

The choice of paint should be made based on the fact that the intervals between painting should be about 7 years, so the material must be of high quality in order to stay on the roof all this time. The selected paint must have all the qualities necessary for this type of composition. This:

• Resistance to external influences, including atmospheric conditions.
• Frost resistance.
• Protection of metal from corrosion.

In addition to the above-mentioned qualities, the coloring matter must be elastic after drying, since the metal has the property of expanding when heated. If non-elastic paint was used for painting, the surface of the finished layer is more likely to crack. A galvanized roof is usually always painted with alkyd and oil paints, but they often cracked, so new compounds have now been developed that are more elastic.

Of course, at the beginning of operation, alkyd and oil compositions will be quite elastic, but over time the layer will simply age. And about influence alkyd paints on a galvanized surface it was said earlier - the paint will crack and come off.

Important! A metal roof should not be painted with water-dispersive compounds, as they provoke corrosion due to the water they contain.

The ideal option for painting a metal roof would be an industrial paint designed specifically for exterior metal work that contains anti-corrosion substances. This composition will create the final elastic coating that will protect the roof from corrosion and fire.

Acrylic based paints designed for working with metal surfaces They are expensive, but they create a high-quality coating without additional priming. If you cover a corrugated metal sheet with this paint, you will get an analogue of metal tiles, which will be much cheaper than the factory material. You can make it either glossy or matte for greater impact.

The most popular paint has become acrylic base for external work on metal "Tsikrol". This is a matte composition containing anti-corrosion additives. It is perfect for exterior decoration of steel, aluminum and galvanized metal surfaces. The composition is used in painting gutters, roofing, gutters, downpipes and other metal elements.

This solution fully meets all the requirements for exterior paint for metal. In addition, there will be no need to pre-prime the surface, and one coat of paint will be enough for perfect coverage.

Paint application tool

It is also worth paying attention to what you can use to paint the iron roof of your house. For high-quality painting of roofing iron, you can use rollers, a pneumatic spray gun and brushes. Brushes should have stiff bristles, as they make it easier and faster to paint large areas with a diameter of 60–65 mm. For coloring small elements horsehair brushes are used to remove stains.

For a flat roof, it is convenient to use a roller of a collapsible design, so that you can change the nozzle if necessary. The roller can also be further extended by adding a handle to it.

Painting tools in construction stores are presented in wide range. The best choice for roof painting is quality tools so that there are no problems with painting work.

A household vacuum cleaner with a spray function and an appropriate nozzle can be used in the form of a pneumatic sprayer. You can also purchase a spray gun, with which you can quickly paint large areas.

Important! Work on the roof should be done with a safety rope and wearing felt boots or shoes with felt insoles glued to the soles. This is necessary so as not to slip on the surface of the steel and not to erase already painted areas.

Conclusion

It is necessary to paint a steel roof in any case, as this provides additional protection from external influences and increases the life of the coating. But you need to choose the right material and tools so as not to encounter the problem of poor-quality finishing and repeated repairs.