Galvanized roof: advantages, disadvantages and installation technology

A galvanized roof provides many houses and buildings with a long-lasting and affordable roofing option. Galvanization is the process of applying a zinc layer to steel or iron to prevent corrosion and increase the roof’s lifespan. Because of this process, galvanized roofs are highly resilient to rust and weathering and can be used in a variety of climates.

A galvanized roof’s longevity is one of its main benefits. These roofs are a long-term investment for homeowners since they can last up to 50 years with proper care. Furthermore, compared to other roofing materials, galvanized roofs require less maintenance, which eventually results in lower maintenance costs.

There are a few easy steps involved in installing a galvanized roof. To support the weight and shape of the roofing material, the underlying structure must first be made ready. The galvanized sheets or panels are then carefully positioned and fastened, making sure they overlap properly to stop water leaks.

A galvanized roof has disadvantages even though it is long-lasting. The zinc coating may erode with time, leaving the underlying metal vulnerable to corrosion. Furthermore, the protective layer of galvanized roofs may be compromised by dents and scratches sustained during installation or extreme weather.

Advantages Galvanized roofs are durable and resistant to rust. They are relatively lightweight, making installation easier. They provide good protection against the elements and are cost-effective compared to some alternatives.
Disadvantages One drawback is that galvanized roofs can be prone to scratching during installation or maintenance, which may lead to rust if not treated promptly. They can also be noisy during heavy rain or hail.
Installation Technology Installation involves securing galvanized sheets or tiles to the roof structure using screws or nails. Proper sealing of joints and edges is crucial to prevent leaks. It"s important to follow manufacturer guidelines to ensure durability and weather resistance.

For your article on "Galvanized roof: advantages, disadvantages, and installation technology," the following is your thesis statement: "Many homeowners choose for a galvanized roof because it combines affordability and durability." This article examines the advantages of galvanized roofing, including its longevity and resistance to rust, as well as its drawbacks, including upkeep requirements and environmental effects. It also explores the installation procedure, emphasizing important methods and best practices to guarantee a dependable and effective roofing solution."

A little story

Why is galvanized roofing, specifically the Falts roof, the most popular choice for historic structures?

Yes, because this was the first—and, in actuality, the only—option available to roofers when it came to the evolution of roofing metal materials. These were long, chopped galvanized sheets. For security and dependability, they used a folding lock to secure these sheets.

However, even in contrast, the modern galvanizing does not hold up to dependability compared to that of the Soviet era. It is likely that the quantity and quality of zincling on a steel sheet is the cause.

In the past, galvanizing was done strictly in accordance with the GOSTs of the day. Maybe back then, the standards were stricter and more stringent than they are now.

As a result, a 60-year-old galvanized roof can still function and just require small repairs. However, there is currently no such question regarding the current Galvanovka.

We’ll figure it out in more detail after discussing the why, how things are going now, and what a contemporary roof covered in galvanized iron might look like.

  • The thickness of the steel base
  • The density of zinc
  • The shape of the roofing material

The thickness of steel

This feature indicates the product’s high level of stiffness.

Mechanical consequences that include:

  • snow load,
  • the load of the human body weight during installation, maintenance of the roof, etc.D.
  • loads during hail or heavy rain.

The thickness of the galvanized sheet for the roof can vary depending on the factory of the manufacturer and could be as follows:

  • From (special -toned steel, less than 0.3 mm.)
  • ST (standard metal metal, about 0.35 mm.)
  • 0.4 mm.
  • 0.5 mm.
  • 0.55 mm.
  • 0.6 mm.
  • 0.65 mm.
  • 0.7 mm.
  • 0.75 mm.
  • 0.8 mm.
  • 0.9 mm.
  • 1.0 mm.


How well and for how long the metal can withstand corrosion depends on the density and quality of the zincing.

What is the zincing of metal and why it is needed?

Without any protection, a sheet of steel oxidizes, rusts, and eventually corrodes. A protective coating must be applied to a steel sheet in order to minimize this process’s speed. Zinc alloy protective coating is used in galvanizing. This layer shields steel from rust by preventing oxygen from penetrating the metal.

How to do it?

The steel sheet is submerged for a few minutes in a bath of molten zinc if you choose not to get too specific. We refer to this process as cold zinking.

The quantity and length of these "procedures" are determined by the zinc content and density of the protective layer. Zinc will generally be contained in greater amounts in the protective layer the longer and more times the metal is left in the "bathroom."

Zinc can also be treated by passing current through a solution-filled bath. Zinc "sticks" to the steel’s surface in this instance. We refer to this choice as galvonic.


The metal is more resistant to corrosion the more zinc there is in the protective layer.

Details as reported by the galvanized gland:

  • If the steel base is thick from 0.35 to 0.55 mm., The approximate content of zinc in the protective layer is from 80 to 140 grams per 1 m 2 .
  • If the steel base is thick from 0.7 to 1.0 mm, The approximate content of zinc in the protective layer is from 100 to 140 grams per 1 m 2 .

What is the size of it? This is, of course, the most basic measure of the zinc concentration in the barrier. In contrast, roofing material with the most common lacactic coating of polyester, which has a steel base thickness of 0.5 mm, has approximately 180 grams of zinc in a protective layer per square meter. However, in this instance, the upper paintwork provides additional protection to the protective layer as well as the steel base.


There are three varieties of galvanized roofing materials available:

Dimensions: A galvanized flat sheet is cut along the desired width and length. Most often, a stroke is 625 mm wide., And the length is by order.
General width of the bay – 1250 mm., Therefore, the width of the bar is fixed.
Description: Barn, this is a kind of “workpiece” for a folding galvanized roof. That is, from a whole bay of galvanized metal, strips of the desired width and length are cut. Wound into rolls and in this form is transported to the object. On the spot, installers, using special potato machines, make paintings of the desired size and dimensions, and mount on the roof, also using a specialized tool.
Price: depending on the thickness of the metal and the manufacturer, the cost of the bar may vary from 180 to 1000 rubles for 1 m 2 .
Falts paintings
Dimensions: Each manufacturing plant releases his paintings, in size and configuration.

Metal thickness: The thickness of false paintings ranges from 0.45 mm to 0.7 mm. The double standing fold is the most typical.

General/utilitarian paintings’ width: 625/550 mm.

We looked at the varieties and key traits of galvanized roofing materials. Why then is galvanized steel roof coating so popular and frequently selected? Examine the benefits and drawbacks of a roof made of galvanized metal.


Price. It is believed that the roof made of galvanized steel is cheaper than everyone else. The question is controversial because the cost per square meter depends on the thickness of the steel base. But, in this section, this fact we will still attribute to the advantages.
Strength. With a large thickness of a galvanized sheet, such a roof is really highly strengths of bending and resistance to mechanical shock. The bends of the wave in corrugated board give additional rigidity.
Weight. Like any metal, roofs made of galvanized steel and is really considered easy. With an average metal thickness of 0.5 mm. The weight of the roof will be about 5 kg. 1 m 2 .
Coloring. The galvanized roof is possible and need to stain at least 1 time in 5 years. Staining, first of all, protects against the effects of atmospheric phenomena, and secondly, allows you to give the roof a more neat and updated look.


Cleaning. Galvanized roofing needs mandatory regular cleaning. Fallen foliage, dirt, dust, the consequences of birds – lead to stagnation of moisture and accelerated rusting of the material. Roof cleaning is not always a pleasant and safe process.
Corrosion. Unfortunately, just a protective layer, in the form of zinc, in itself is very unstable to the effects of atmospheric phenomena. So, rain, snow very quickly washed out zinc from the surface of the metal. The faster the zinc protective layer is washed, the faster the metal begins to corrode. Yellow spots appear first, the metal is oxidized, then the metal corrosion process is launched.
Noisiness. Any metal roof is the most “noisy” version of the roofing material. Even if the roof is insulated, and the noise level becomes lower, all the same, such a roof cannot be called comfortable in noise. If the attic is resident, then this, especially, is a separate conversation.
Fragility. As we said above, the protective zinc layer is quickly washed out without additional protection, and this is directly reflected in the durability of the material. The galvanized roof will last an average of about 30 years. At the same time, metal with an upper paintwork, has guarantees of up to 50 years for the safety of the appearance.


Imagine installing a galvanized roof in two variations: a corrugated board roof and a folding roof.

We will schedule a meeting to discuss the fundamental guidelines for working with any metal roof before beginning the installation.

  1. Movement of sheets It is allowed only 1 piece, excluding the sliding of the sheets on each other. Otherwise, the sheets scratch and in this place the metal will be unprotected and subject to corrosion.
  2. You can only walk on the roof on the roof In shoes with soft soles.
  3. Advance (the top of the wave or locking connection) – IT IS FORBIDDEN.
  4. It is advisable while walking on metal, to put the leg only to those places where iron is attached to the crate.
  5. FORBIDDEN cut a galvanized iron on the roof with a grinder.

Installation of the fold roof

First, let’s discuss the Faltsian roof. When they bring a barrel and the roofers themselves take installation photos and carry out the work, we won’t even entertain the possibility. This is an independent tale that is entirely personal.

The products are offered as both a traditional folding painting option, which includes single and double standing folds, and a more practical choice called clickfalls, in which the paintings "snap" together without the need for extra tools.

Either way, the most sealed kind of metal roof is the folding roof. The tightness of the compounds is guaranteed because the paintings’ castle connection is located inside.

Important points

  1. Installation. Installation of the folding roof is carried out in direction from left to right.
  2. The step of the crate. Depends on the angle of the roof. With the angle of inclination of the roof from 16 to 25 degrees – the crate is continuous. There should be no changes in the plane between the boards.
  3. Klyammer. When installing paintings by a double standing falz, 6 will be required Kleammers 1 m 2 . If the length of the slope is up to 4 meters, then motionless Klyammers are used. With a slope of 4 meters or more, mobile and motionless are used, in a ratio of 70/30 %, respectively.
  4. Self -tapping screws. Calculation of screws for fastening the Klyammers and Continue elements is made in accordance with a special algorithm, which is usually indicated in the installation instructions by the manufacturer.
  5. Falts compounds. In appearance, there are: lying and standing.
    by compaction: single and double.
Description. In addition to the tools listed above, it may also be required: clamps for lifting paintings on the roof, corrugated scissors right and left.
Carnish overhang
  1. In order to protect the undercarbon space from the penetration of insects and birds, the ventilation mesh is stuck along the end of the cornice.
  2. For the subsequent installation of gutter holders of the drainage system – “Wall” is prepared in the initial crate. Distribution hooks are installed in the prepared places (gutter holders). The installed gutter holders should be in the level with the crate, that is, the "flush".
  3. On mounted hooks, the cornice of the bar is installed (dropper). The dropper is fastened in a checkerboard pattern, with a step about 200 mm.
Installation of paintings
  1. The start panel is installed, which is attached to both sides to the crate.
    so that the paintings are hermetically fastened with each other on a cornice overhang, the following method can be used.
    Pictures are cut near the locks, undercuts with a depth of 25 mm.
    Cutting the cut out 180 degrees in the width of the picture.
    Lower castle protruding behind the bend line is cut off.
    Upper castle – cut off half.
    The picture is installed on the slope, the locks are connected.
    not cut part of the upper castle closes the end of the castle.
  2. Fasteners are installed.
  3. The second picture is installed next to the already fixed and settled. The second picture with a bent edge should overlap the first picture.
  4. Both paintings, together with the Klyammers, are clamped in the right way (single or double), forming a reliable locking connection.
  5. The finish picture, if necessary, is cut in size along the pedimental overhang. Bends into the pediment and fixed by the narammers. The bend, subsequently, is closed by the strips of a pedimental overhang.

Installation of corrugated board

A profiled sheet can be used to install a galvanized roof more quickly, easily, and without the need for a specialized tool. However, there are situations when the fold roof is not as reliable or tight.

Important points

  • The step of the crate. Since the profile does not have such a thing as a “step of the wave”, the recommended step of the crate under the profile is 500 mm.
    The continuous crate is installed at the place of attachment of roofing fences and in the valleys.
    If the distance between the rafters exceeds 1 meter, the nipple step is made less, or a thicker blackboard is used.
  • Self -tapping screws. Depending on the material of the crate, screws are used on wood or metal.
    Calculation of self -tapping screws – 7 pieces per 1 m 2 . Roofing self -tapping screws are usually taken with a press -shaped 35 mm long., for attaching premature elements (especially the horse, yndov, etc.D.) use screws with a length of 50-70 mm.
Description. The tool requires universal and simple, which is used in the installation of metal tiles or corrugated board.
Carnish overhang
Description. Having installed a galvanized roof from a profiled sheet, the design of a cornice overhang, the same as that of any metal roof.
  1. Installation of a ventilation mesh along the end of the cornice, to protect the subcutaneous space from the penetration of insects and birds.
  2. In the initial crate, “Wall” is prepared for the installation of long drainage hooks. Distribution hooks are installed in the prepared places (gutter holders).
  3. Installation of the cornice bar (dropper).
Installation of corrugated board
  1. The profileist is mounted in the lower part of the wave. Places of longitudinal overlapping of sheets – in the upper part of the wave.
    If the slope of the slope is less than 12 degrees, then the place of overwhelming the sheets, you need to additionally compact or seal. For sealing, they usually use-roofing a roofing or butyle-tape tape.
    Self -tapping screws are twisted so that the sealing gum on the screw was slightly pressed.
  2. Self -tapping screws are screwed strictly perpendicular to the crate.
  3. Laying laying is carried out from the end of the slope.
  4. Longitudinal overlap of sheets, depending on the type of profiled sheet – 1 or 1.5 waves.
  5. If a transverse docking of sheets is required, a number of rules must be observed.
  • The docking of sheets in the transverse direction must be on the crate.
  • The size of the overlap of sheets in the transverse direction from 200 mm.
  • The overlap of sheets in the transverse direction is fixed with self -tapping screws into each lower wave at the junction.

6. After the sheets are installed, all other components—apart from the bar’s cornice—are mounted.

Many homeowners choose galvanized roofing because it provides a number of benefits. First and foremost, galvanized steel is remarkably durable; it has a longer lifespan than conventional roofing materials because it is resistant to rust and corrosion. Over time, these long lifespans save money because fewer replacements and repairs are required.

Furthermore, galvanized roof installation is a fairly simple process that can be completed by professionals or do-it-yourselfers alike. Because the material is robust but lightweight, handling during installation is made easier, and the building’s structural strain is lessened.

It’s crucial to take into account any potential disadvantages of galvanized roofing, though. Its initial cost, which can be more than that of some other roofing materials, is a major concern. Even though there can be a higher initial cost involved, the long-term advantages frequently exceed this cost.

Maintenance is an additional factor to consider. Even though galvanized roofs require less upkeep than many other options, regular inspections and small repairs might still be required to guarantee long-term performance.

In conclusion, for homeowners looking for dependable protection and longevity, a galvanized roof offers a strong and affordable alternative. For those who choose to invest in this type of roofing, peace of mind and long-lasting value are guaranteed by its easy installation and corrosion resistance, which make it a practical choice for a variety of architectural styles and environmental conditions.

Video on the topic

Flat roofs of advantages and disadvantages

Installation of a folding roof from a jacket from a bloodstream.

Belarus .G.Rechitsa.How to paint a galvanized roof from www properly.Cleaning.Bel

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Alexandra Fedorova

Journalist, author of articles on construction and repair. I will help you understand the complex issues related to the choice and installation of the roof.

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