How to choose front paint
To upgrade a residential building, there is no need to carry out its expensive repairs. It is enough only to update its facade - and the building is transformed. Breathing a second life will help painting the facade. At first glance, it seems that choosing a paint is quite simple. In fact, each type of facade paints has its own characteristics, on which color stability, brightness and durability depend. How to choose a facade paint, will be discussed in this article.
What is exterior paint
To choose the right front paint, first of all, it is worth figuring out what it is.
Facade paint is a material for covering the walls of buildings from the outside. Since the facade paint is applied to the walls from the street, it must be highly resistant to the effects of various precipitations and sunlight, sudden temperature changes.
What to look for
When choosing a facade paint, it is necessary to take into account its main characteristics:
Composition. In order for the facade paint to have maximum durability, it must contain binders. These can be lime, potash glass, cement, silicone resins, synthetic vinyl resins, and acrylic resins. Manufacturers of poor-quality facade paints, trying to save on components, add substances to increase the volume instead of binders. The quality, durability and durability of such paints leaves much to be desired. Therefore, when choosing a paint, you should pay attention to whether there are binders in its composition.
Moisture resistant. Each owner dreams that the applied front paint lasts as long as possible. External environmental influences can destroy it. Therefore, it is very important that the paint is as resistant as possible, for example, to moisture. Permeability is another important selection criterion. High-quality exterior paint protects the wall of the building from moisture penetration inside.
Absorption - the ability of paint to absorb moisture. High-quality paint should have a low level of absorption. Otherwise, the accumulated moisture will contribute to the wetting of the walls of the building and the appearance of mold and rot. The average value of the moisture absorption coefficient of facade paint is 0.05 kg / (m ?? h in st. 0.5).
Exposure to sunlight. Facade paint should not let the sun's rays. Otherwise it will lead to the destruction of the paint and the walls of the house. The sun rays falling on the surface of the walls, contribute to the drying of their surface, the appearance of cracks and swellings.
Paint consumption consumption. Modern facade paints have approximately equal consumption value. It depends on the type of surface of the walls and their texture. If the wall is smooth, paint consumption will be minimal. On a rough and uneven surface will require much more exterior paint. Modern facade paints have average consumption rates - from 120 to 200 g / m2 for one coat of paint.
Resistance to vapor penetration. Another important feature when choosing front paint. Water vapor is released from the walls and from the inside of the building. High-quality paint should not prevent its selection. Otherwise it will lead to the destruction of the walls of the building. High-quality paint should have a high degree of vapor permeability. To find out this indicator, it is necessary to clarify its value indicated on the label. The optimal value should be 130 g / m2 This means that in 24 hours the facade paint is able to skip 130 g of water vapor per meter.
Abrasion resistance. This parameter determines how many cleaning and cleaning cycles the paint can withstand. It also takes into account the type of cleaning: dry or wet. This parameter is determined by manufacturers conducting laboratory tests. The higher its value, the more stable the facade paint. The optimal value for this should be 5000. This means that the paint is able to withstand 5000 cleaning cycles, without breaking down. It should be borne in mind, the higher the resistance of paint to abrasion, the longer it will be able to serve.
Types of facade paints
Depending on the composition of the paint, its basic properties also change. Its main component is a binder. With its help the paint applied on a surface forms a film.
In its composition, facade paints also have a solvent. Depending on it, the following types of paints are distinguished:
- Water soluble. Non toxic. Do not incorporate harmful chemicals. Safe for humans. Can be made using aqueous dispersions of various polymers or using mineral inorganic binders.
- Organic Soluble. Possess toxicity. Fire hazardous. Harmful to human health. Water vapor is bad. Resistant to temperature extremes.
Types of waterborne paints
In order to ensure the safety of human life and health, it is advisable to use water-soluble facade paints.
According to their composition, they can be:
- water dispersion;
- mineral.
Paints based on aqueous polymer dispersions
Their distinctive feature is the binding particles. They are suspended in water.
They can be made on the basis of aqueous dispersions of synthetic polymers or emulsions of silicone resins.
Note! The main advantages of water-dispersed paints include a short drying time, safety, non-toxicity, the ability to achieve the desired consistency of paint (by diluting with water).
Water soluble or water-based paint is white. To get the desired color shade, you should add color to the paint.
The main types of water-dispersion paints:
- Vinyl. They contain polyvinyl acetate or a copolymer of vinyl acetate. Their main advantage is low cost. However, these paints have a low level of water resistance.
- Silicone. Their main substance is silicone resin. Possess high level of moisture resistance, do not collapse under the influence of high temperatures.
- Акриловые. Основное связующее вещество — дисперсия сополимеров акрилатов. Acrylic фасадная краска хорошо ложится на поверхность. Рекомендуется использовать на стенах из бетона и цементно-волокнистых плит.
Mineral water soluble paints
Made on the basis of inorganic binders. These include cement, lime and liquid glass.
- Paints based on cement. Have the appearance of dry mixtures, diluted with water. Made on the basis of Portland cement. Cement paints are easily destroyed, well pass water vapor, have a low level of moisture resistance.
- Lime based paints. The main substance is slaked lime. Available in the form of pastes or pigmented blends. Have a low level of strength, durability, durability. Their advantage is low cost.
- Paints on the basis of liquid glass. Their main substance is liquid glass or potassium silicate. Have a high level of durability. Do not spoil under the influence of sunlight.
With the right choice of facade paint, given its basic characteristics and features, you can get a high-quality and durable coating of the external walls of the building.