Metal roofing is one of the poorly understood roofing types, which is why there are myths, concerns, and half-truths concerning metal roofing. Here are some of these things and the real truths behind them.
Most metals rust, which is why many people assume that all metal roofs have rust problems, which weaken the roofs and are also aesthetically unappealing. This is a good concern because a few metal roofs do rust, but there are many more metal roofs without rust problems. This means there must be an easy way of keeping rust at bay, and they include:
- Galvanization – coating the ferrous metal with a non-ferrous metal, usually aluminum, which doesn't rust
- Painting the roof – the paint protects the metal below from rusting
- Roofing Material – Using a roofing material that doesn't rust easily, such as aluminum
Another concern people have with metal roofs is that of noise; after all, when you bang your hands on a metal sheet it raises a ruckus, doesn't it? Many people are particularly concerned that metal roofs make a lot of noise when it rains or snow falls. It cannot be denied that metal roofs may make some noise, but whether you will be able to hear the noise is a different matter altogether. Here are some measures that roofing contractors use to prevent metal roofs from being noisy:
- Ensuring that the different parts of the roof have room for thermal expansion
- Installing the right insulation material to dampen the noise
- Using metal profiles that are known to be quiet, such as flat or standing seam profiles
- Ensuring that all fasteners are properly tightened
The belief that metal roofs attract lightning comes from the knowledge that metal conducts electricity, and a lightning strike is basically a bolt of electricity. Fortunately, this belief is a pure myth; the metal doesn't "attract" electricity at all. Whether or not lightning will strike your home depends on other factors such as the lighting frequency of the area, your home's height relative to nearby structures/objects, and the topography of the area.
Performance in Extreme Weather
Lastly, there are also those who believe that metal roofs perform poorly in extreme weather; that the roofs either get too cold during the winter season or too hot during the summer season. This belief seems to be sensible because metal roofs are good conductors of heat. However, your metal-roofed house would only be extremely cold during the winter or the only hot during the summer if the metal was the only thing separating you from the outdoor elements.
However, no roofing constructor will ever install such a roof; the metal is usually installed over several other materials, including the underlayment and insulation. With a properly installed roof, the outside weather shouldn't affect your house at all and our metal roofed-house will feel comfortable just like other houses with different materials on their roofs.