Galvanized paint - properties, specifications
The roof of a residential building or industrial building will constantly be exposed to atmospheric influences. Corrosive phenomena begin to develop on the metal roof from precipitation.
Galvanized roofing is a structure that is covered with sheet steel with a zinc layer protection. The owners of such housing buildings often wonder what to paint such a roof with. Metal surfaces that are not protected begin to deteriorate over time.
Among the majority of galvanized paints and varnishes, one should choose a paint for the galvanized type of roof, which helps to stop corrosion and metal destruction.
Thin steel sheets with special zinc protection when leaving the factory will be covered with a special oil composition. Its function will be to protect the metal from the effects of natural influences, but this type of protection will last for a maximum of 1.5 years. The oil-like cover will be washed away by precipitation, and then the question arises of what to paint the galvanized metal on the roof,
and also what problems will be solved:
- Prevents corrosion.
- Improving the appearance of the roof, the shade of paint will be combined with the style of the house and the site as a whole.
- There will be financial savings on work in terms of replacing a destroyed roof with a new one, and painting a galvanized roof will cost you much less.
Now let's talk about the features of choosing a tool.
The paintwork of the roof must necessarily interact with galvanized sheets:
It cannot be stained with any type of dye. If the paint and varnish material is chosen by mistake, a reaction with zinc will occur and the metal will begin to collapse.
The listed properties are typical for acrylic-type compounds. It is acrylic that forms an elastic, durable and at the same time resistant to wear coating. An important drawback of the composition is that the cost is not affordable for mid-level buyers.Among the acrylic type of dyes, the Belarusian brand MAV BASTION KR-12 will be in demand.
In the construction market, paint and varnish Zinc is represented by such popular brands:
Please note that galvanized paint for outdoor use also has disadvantages - salts appear on the coating, and the anticorrosive resistance is maximum 4 years. If the degreasing of the roof to be painted was poorly carried out, then the coating will quickly burst, and small bubbles will appear on the covering layer - this appears when working with a roller.
The paint will not lose its excellent qualities at low temperatures.
Before you paint the galvanized roof of a house with acrylic paint Cycrol, it does not need to be treated with a primer composition.After that, the adhesion to zinc will increase, and the paint and varnish material is consumed sparingly, so it is enough to cover everything with one layer.
becoming, like Unicom, it will be held on a fairly perforated roof if there are only pieces of galvanized coating. The paint will adhere perfectly and is considered an inexpensive paint material.
In Russia, you can buy an enamel anti-corrosion paint of a single-component type for roofing galvanizing, this is "Serebrol".It is usually painted on a steel surface, and the base of the material will be aluminum powder. Thanks to it, the protective qualities of the paint and varnish material increase, and the composition also contains epoxy resins, perchlorovinyl compounds, additives, and an organic solvent.
The paint and varnish material is resistant to moisture, is able to withstand mechanical damage, as well as the effects of automotive chemicals. The roof will be covered with a high-quality coating if you apply paint and varnish in two layers. They are used to protect the roof surface in latitudes where there are a lot of natural negative influences. Seam roofs, galvanized gutters and downpipes should be painted. Their wear will be reduced by 3 times.
Please note that alkyd, alkyd-urethane enamels form a beautiful finish. But on a galvanized roof, the material will not hold well, and before painting the galvanized roof on the roof with a similar paint, an additional primer should be applied, or a 3 in 1.
In addition to the roof, which is made of galvanized metal, protection will need ventilation system, drainage scheme made of similar material. A specialized surface primer should be applied, which is protected by Rostex Super zinc.
Now a little about contraindications.
Considering that the galvanized layer is rapidly dissolving at the moment of formation of atmospheric compounds, the paint and varnish material containing alkaline soaps and acids no salts will be applied to cover the galvanized roofing material. Although these constituents increase paint adhesion, they will convert rust to iron phosphate. If such compounds are applied to the galvanized roofing, they will quickly flake off.
Please note that contact of the galvanized surface and copper must not be allowed, and if a dye with copper pigment is applied, and then the process of degradation of the roofing material cannot be avoided, even if the copper is oxidized. And although the rate of destruction is much lower than in direct interaction with copper, because of this, dyes are not used for coloring, which contain the following pigments - tin, copper and antimony.
Before proceeding with the paint for galvanizing, the metal should be prepared:
It is required to use white spirit or other similar compounds (for example, solvent 647).After them, the paint and varnish material will adhere better to the galvanized surface. It is not necessary to degrease before applying acrylic paint. On a heavily soiled roof, it is better to carry out the procedure, and the staining will begin immediately 1/2 hour after the degreasing process.
The new roof just laid will be prepared for painting:
This will clean up the factory grease.
Actions should be taken if it is decided to paint a new roof immediately after installation.
How to improve grip? To do this, it is necessary to ensure such conditions under which the liquid type of paint for metal will flow without obstacles into the microscopic pores and cracks of the surface to be painted. This will mean that the galvanized base for applying the paint and varnish layer must be rough and porous, for which the surface must be sanded or abraded.
It is also permissible to use a primer that is specially designed for such purposes, for example, SpecialMetalsPrimer. Natural aging of the metal surface is another excellent method for improving adhesion. This takes time - at least one calendar year. During this period, galvanized sheets will have time to be covered with a special coating, which adheres perfectly to the paint. How to cleanse aged zinc? Before staining, it should be slightly cleaned and degreased with a solvent.
Good advice! When buying materials for painting, it should be borne in mind that the primer for galvanized metal must be from the same manufacturer as the paint and varnish composition. Ideally, the solvent should be from the same brand as the paint. It's just that components that are used by different manufacturers may not be compatible with each other.
Painting the roof with paint
Painting work should be done with a roller or wide brush. The first one should paint large and even areas, and the second tool is used to paint the surface of small parts.
If you have skills when working with a spray gun, then it can be applied. The folded roof is also painted with it, and the spray gun is installed for convenience on a special extension rod. On the roof, you will need to pave a ladder of boards, which is required for movement. Most often, the coating can be two or even three layers. The applied layer should be thin, because streaks will begin to appear on the thick one.
Before each coating, you should wait for the drying time of the previously applied layer of paint, and it will be indicated by the manufacturer of the paint and varnish material on the can.
Recommendations from specialists
Most paints and varnishes are used for coating even at low temperatures.If the warm season is missed for staining, it is better to postpone the work until stable frosts. It is also not recommended to paint the roof from 0 to -8 degrees. At a similar temperature regime, condensation will not appear on it.
The best time to work is a calm autumn morning. In the evening, you can begin to carry out all the preparation procedures. The second coat should be applied in the evening of the same day, and by that time the first coat will dry out. Moreover, there will be time to notice errors in the work. The last thing to do is to paint the ridge and downpipes.
By the way, you can paint the entire roof with a brush, and then you should apply paint and varnish material without gloss, with pigments of aluminum-type powder. Also, streaks and bristle marks will not be noticeable.
Posted By: Work Style |11, Nov 2020
Posted By: Work Style |01, Nov 2020
Posted By: Work Style |04, Nov 2020
Posted By: Work Style |11, Nov 2020
Posted By: Work Style |04, Nov 2020