The corrugated roofs and their close relatives, the ribbed roofs, offer the original style of corrugated roofs. With an average cost of $4 to $8 per square foot installed, corrugated board costs as much as asphalt shells, especially in the lower part, but is much more durable, energy efficient and can last much longer than asphalt shells if properly maintained.

What are corrugated and ribbed metal sheets?

via Alternative buildings Blog

A coil of sheet steel, usually galvanized steel or aluminium, is fed into a coil forming machine that gives the sheet steel a folded, U-shaped, wavy shape – a basic option for corrugated roof and wall panels.

Punching of corrugated rolls. Source: Corrugated Metals.com

Corrugated board adds considerable structural strength to the metal panels, allowing them to be used in otherwise thin sheets in enclosures of buildings, such as roofs and claddings. Watch the video below to see how it goes:

Old school corrugated sheets

At the height of the industrial age, steel became relatively cheap and abundant. Metal was seen as a material that provides a cost-effective way to cover large agricultural and industrial buildings. Corrugated steel panels were often uncoated at the time, but this was not a problem because there were enough replacement steel panels for roofs and walls to replace corroded panels.

When steel corrodes, visible rust forms. If the old steel plates become too ugly or, even worse, have leaking holes, they are replaced by new shiny parts.

Nowadays, corrugated board is often chosen because of its old-fashioned appearance and relatively low cost.

Most modern corrugated sheets are usually coated with metal (zinc) to prevent oxidation and corrosion and are therefore designed to last for decades.

G-60 vs. G-90 Galvanized steel sheets and their paint finish.

The process of coating steel sheets is called galvanizing. There are two types of galvanized steel sheets: G-60 and G-90. G-60 is a lower quality and cheaper galvanized steel, while G-90 is a higher quality, thicker and more durable galvanized steel.

G-90 steel panels are usually also coated with a high-quality paint. B. Kynar 500, as opposed to the cheaper acrylic paints generally used on lower quality G-60 steel sheets.

Pay attention: G-90 (26 or 24 gauge) steel panels coated with Kynar 500 paint can be used in residential areas, while G-60 (29 gauge) steel panels may only be used for sheds, garages and low spaces in agricultural or industrial areas.

Corrugated sheets in relation to corrugated roofs

Corrugated metal sheets are not like corrugated or ribbed metal sheets. Corrugated sheet refers exclusively to U-shaped and sometimes V-shaped panel plates.

The rustic appearance of the corrugated sheet becomes easier. However, the main advantages of corrugated board are its cost-effectiveness, durability and the wide range of colours and finishes available.

Installation and options

Corrugated sheets are generally 2 to 3 meters wide and are available in different lengths, such as. B. in 8- and 12-foot sheets. When the roof is installed, the metal panels form overlaps along their curves. The panels are then fixed with metal screws that not only pierce the two panels, but also the roof ceiling or subfloor.

Of course, even if the roof has a suitable pitch, the metal panels will drain water because metal is not a porous material. However, when the panels overlap, a joint is created and a sealant is used to prevent water from seeping into or through this small space.

Installing corrugated sheets on the entire roof can be done fairly quickly, especially for a simple gable roof, if the installer has all the necessary tools, experience and help from others.

This tutorial from DoItYourself.com explains how corrugated and ribbed metal panels can be a fairly simple do-it-yourself project when covering up a small barn or garage.

However, the installation process can be quite grueling and time consuming for large projects, especially for less experienced people. Therefore, large projects almost always benefit from a professional installation, as is the case with all roofing projects. And since the costs are not too high, the best choice is to use insured and certified professionals who guarantee their products and production.

As far as the options are concerned, it is in fact about the actual material and its thickness or strength, the paint and the colour possibilities. Steel is always the basic material.

In modern times it is usually coated or referred to as galvanized steel. Galvalum steel (metal surface of zinc and aluminium) is sometimes seen. – Both coating options provide a protective coating that takes about ten to two years to act on the steel. Rust is therefore no longer a problem for at least 20 years after installation of the roof.

Aluminium is another metal option for corrugated sheets. The costs are virtually the same as for coated steel. Stainless steel (an alloy of steel and chromium) is also an option, but stainless steel is more expensive.

Corrugated stainless steel panels are highly resistant to corrosion and offer a brighter appearance than traditional steel products.

Most products are sold in 26 or 29 meters. The smaller the track number, the thicker the material. And the thicker the material, the stronger it is. Although the thickness involves a little more work and therefore costs.

Pay attention: When assessing steel roofing options for residential buildings, a minimum of 26 wells should be used.

The colour possibilities are virtually unlimited. This applies to paint. It is possible to paint these metal panels by hand, but this can be much more expensive than a factory paint job.

In the manufacturing process, the metal sheets are passed through a metal mill in a very short time and evenly coated. The use of high-quality colour pigments gives the product an extra high-quality protective layer.

If you contact a professional contractor, they will probably offer you brochures with different colour options (usually 10 to 40 options). Custom colour options are also available, but usually at a higher price because they are not mass-produced.

Your local hardware store, such as Lowe’s or Home Depot, probably has these plates. They will be cheap, although their size and colour options are probably limited.

Remember that corrugated sheets are not only for roofs. Chances are that your roofer still has some materials (unless otherwise stated in the contract or specifically discussed) that you can use as roofing material for your exterior shed or even for interior projects. Look at the image below to see how the panels can be used indoors.

via Bridger Steel

Costs and prices of corrugated roofs

Corrugated roofs are the cheapest option for metal roofs, while standing seam roofing is by far the most expensive option. For golf roofs it starts at 4 to 5 dollars per square meter. – It is a complete installation of for example G-60 galvanized steel, 29 gauge, painted panels (with acrylic or polyester, not Kinar 500) loaded with square feet.

G-60 refers to the amount of metal coating per square foot. Although it is a cheap option, it is still of much better quality than what our ancestors used 150 years ago.

If you want a good mid-range option, such as 26-gauge G-90 galvanized steel, factory painted with Kynar 500 paint (not acrylic paint), the range is about $5 to $8 per square foot installed.

The reason for increasing the range under the second option is the variability of all other important factors that are taken into account, such as B. the quality of the installer, your location, the complexity of your roof and slope and whether or not it is necessary to tear off the existing roof.

Even at $6 to $8 per square foot, a high-quality ribbed metal roof with hidden fasteners is less expensive than a standing seam roof. However, a standing seam has the important advantage that there are hidden or concealed closures and therefore leaks much less during the first 30 years.

Did you know that? Corrugated roof panels typically contain more than 30% recycled steel, making the product eligible for a LEED credit from the Green Building Council.

Metal roofs have an excellent return on investment, which is the value you can expect for your golf roof when selling your house. On average, the return on investment is about 86% of the initial investment.

Advantages of corrugated roofing

  • Very low costs, both for the materials and for the entire installation
  • Because it is a metal, it is fire resistant and fungus and vermin are no problem.
  • Different color options
  • A big comeback
  • Respect for the environment

Disadvantages of corrugated sheet coating

  • Not waterproof, because the caulking does not last as long as the material itself.
  • As a rule, it should be maintained after 15 years, e.g. B. Checking/fixing fasteners, re-closing or repainting.
  • Aesthetically it is not the most beautiful metal option, but it is a subjective point of view.

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