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Important Pros and Cons of Corrugated Sheet Metal Roofing

Pros and Cons of Corrugated Sheet Metal Roofing
Once widely used for commercial, industrial and agricultural purposes, corrugated sheet metal roofing is now popular for residential projects too. Here is a brief overview about the pros and cons of this roofing material.
Sonia Nair
Last Updated: Dec 09, 2017
Though expensive, corrugated sheet metal roofing is lightweight, durable and recyclable.
Metals have been used by humans since time immemorial. Even today, they are widely used for various purposes. Through the centuries, different metals have been used as roofing materials. Invention of steel and other alloys, and advancements in technology are some of the factors that favored the metal roofing industry.

Earlier, sheet metal roofing was mainly used for agricultural, commercial and industrial purposes. Barns and industrial buildings with such roofing were a common sight, at that time. Though it was rarely used for residential purposes, the popularity of metal sheet roofing diminished gradually. The material was prone to rust and corrosion. Through the years, these products have evolved a lot, and now metal roofing is available in different styles, patterns, and types. Apart from being rust-resistant, these newer versions are also aesthetically appealing.
What is Corrugated Sheet Metal Roofing?
Corrugated Sheet Metal Roof
Most of us are familiar with corrugated cardboard, which is used to make cartons, boxes and shipping containers. Made of flimsy paper, corrugated cardboard is more rigid and strong than a stack of plain paper. This is due to the wavy pattern in which the papers are arranged. The same principle applies in case of corrugated metal sheets, which are made in a wave-like pattern, with alternate ridges and grooves. This pattern gives them extra strength, despite being lightweight. So corrugated metal sheets are stronger than plain metal sheets.
Various metals and alloys are used for making corrugated sheet metal roofing. They include copper, aluminum, zinc alloy, tin (terne), stainless steel, lead, and galvanized steel. Aluminum is mostly preferred for residential purposes, as this metal is extremely lightweight. It is also durable and is resistant to rust, even if there is no coating. Usually, it is coated and painted for better looks and a longer lifespan. Stainless steel corrugated sheets come with a 'terne' coating, which gives a natural matte-gray finish. However, this type is very expensive. Copper roofing is easy to install and has a brilliant sheen, but can be very expensive. Metal sheet roofing can also be made of alloys, which are strong and durable, but again, the cost of alloys is on the higher side.

With the latest advancements in technology, corrugated sheet metal roofing comes with a wide range of user-friendly features. The modern-day versions are not only resistant to rust and other natural elements, but are also in sync with the latest trends. Various types of coatings are used for making the product waterproof, algae-proof, rust-proof, and heat reflective. However, it is advisable to have a basic know-how about the pros and cons, before choosing a roofing material.
Corrugated Sheet Metal Roof
✤ The most popular feature of corrugated sheet metal roofing is its durability. If properly installed, these roofing sheets can easily last for 25 to 50 years. Some manufacturers offer a warranty of 50 years.

✤ These metal roofing sheets are treated and coated with chemicals to prevent the growth of algae and mildew. They are also resistant to rot and rust, and insects like termites.
✤ Other beneficial features include its non-combustible nature. This roofing material comes with a Class A fire rating, which is the highest rating as far as fire-resistance of a product is concerned.

✤ Those with heat-reflective coatings are beneficial for reducing the air conditioning costs. Tax credits are also offered for those who install certain types of energy-saving metal roofing.
✤ Metal roofing is ideal for those living in cooler climates, as metal attracts heat and warms the interiors. Some types come with weather-resistant features too.
Corrugated Sheet Metal Roof
✤ Metal roofing is also lightweight, and can be installed easily. This reduces the load on the roof structure and the building itself. Unlike asphalt shingles, each metal roofing sheet is large enough to cover more space and this saves time.

✤ Maintenance is minimal in case of metal roofing, which can also be cleaned easily. All you need to do is to check it once or twice a year.
✤ Above all, corrugated sheet metal roofing is a green product that saves landfill space, as it lasts longer and is recyclable.
Installation of Roof
✤ This roofing material is expensive, when compared to other materials, like asphalt shingles. Another drawback is the high cost of installation. This is usually offset by less maintenance or repair work. Experienced installers with technical skills and expertise are required for this purpose.
✤ Corrugated sheet metal roofing is prone to denting. Dents can be caused by any heavy object that may fall on the roofing. Even hailstorms can result in such dents.
Old Metal Roof
✤ Users often complain about the noise created by rain falling on these metal sheets. This can be reduced by installing an insulation beneath the roofing material.

✤ Though long-lasting, this roofing material may scratch, chip, peel, and fade over time. In some cases, metal roofing sheets may curve due to temperature variations.
Though different metals and alloys are used for making corrugated sheet metal roofing, the most popular among them are aluminum, stainless steel, galvanized steel, and copper. Galvanized steel roofing is cheaper than other types, but it may develop rust, if the coating wears away. It can also be damaged due to salt exposure in coastal areas. Aluminum roofing is good for those living in coastal areas, but is more susceptible to denting. Copper roofing is costlier than both steel and aluminum.
If installed properly, corrugated metal sheet is a perfect material for roofing. It is lightweight and durable and fits into the criteria of most builders and house owners. However, it is always advisable to know more about the material, before you invest. For this purpose, you may seek the advice of roof contractors or manufacturers of roofing materials.