Corrugated metal may not be the most attractive type of roofing that you will have ever seen! It is not normally used for residential properties, its more usual use is more likely to be industrial or farm related, perhaps a cattle shed or similar. The pattern of corrugated metal is somewhat similar as you might have guessed to corrugated cardboard. The pattern itself is good for strength and durability and this is the main purpose of it. It is not a high end roofing material, so keep this in mind if you care thinking about using it for your home.
One of the biggest downsides of this metal is that it can rust quite quickly. So in order to get around this problem, manufacturers have made the corrugated material into a galvanized version. The galvanized corrugated metal has been treated by a chemical process which will actually prevent it from rusting. The way this process is used is by a process of zinc coating which reduces the possibility of corrosion.
Another downside of installing this type of roof is the noise factor that you will experience if you are living or working in the building. It does not matter so much if you have just used the building for agricultural animal storage, but if it's for your home then you may experience rather a lot of noise. The best way to reduce the noise with a metal roof is to install some kind of insulation material before you fit the corrugated metal.
The life span of a corrugated metal roof can be up to 60 years or more dependent on the weather conditions, so if its your first home, then it can almost last a lifetime. Metal is also recyclable to, so if you ever need to, you can simply get it taken of and recycled. Overall, this type of metal roof is a good cheap alternative to higher quality roofing materials and is a good option to consider.