Classic Metal Roofing Systems


Metal Roofing Energy Efficiency

Here’s a special post from Todd Miller.

I am starting a new series about 10 critical things that roofing contractors often don’t know about metal roofing. In my 35 years of answering questions from homeowners and contractors about metal roofing, these 10 things come up over, and over. Unfortunately, I often hear stories of homeowners who had metal roofs installed but in the end, were upset and frustrated with a roof that did not perform as they expected.

When I dig into these situations, I often find critical considerations particular to metal roofing that the contractor simply was not aware of. This month, I will explain 2 of those 10 critical considerations: Metals and Finishes.

If you’re more interested in curb appeal and beauty than the technical issues, I can assure you that what happens with metals and finishes have an impact on both.

2 Critical Things Most Contractors Don’t Know About Metal Roofing


1. Metals

There are different grades and types of metals used in metal roofing and they will have different performance expectations. Which metal is chosen can dramatically impact how the roof performs in terms of durability, energy efficiency, and other things.

With steel, it is important to know not only the type of steel but also the grade of steel in order to estimate its performance. Steel, even with zinc, aluminum, or alloyed metallic coating on it, is still steel. Ultimately, cut edge protection for steel is derived from the zinc in the metallic coating on the steel. There are different grades of steel and better cut edge protection is achieved with better steels. Minimum grades of steel the industry recommends for metal roofing are G90 and AZ50.

Metal thickness is also something to consider but a lot of games are played with steel thickness (referred to as “gauge”). Gauges have significant tolerances and different manufacturers take different approaches to those tolerances, including whether the metal thickness is measured with or without paint. However, the ultimate performance of a roof system typically has far more to do with its design, the coating on the metal, and proper installation than the thickness of the metal.

Steel is inherently stronger than aluminum and copper but that is why the thicknesses of aluminum and copper are greater than those of steel used to produce metal roofing. Some aluminum and copper roofing products may also have optional strengthening backers that can be used to fill up any air space between the metal and the roof deck. All metal roofs require some extra care when walking on them but one benefit is that, unlike roofs made of other materials, they do not lose impact resistance with age.

Aluminum and copper, being non-ferrous metals, will perform better than steel in corrosive environments including coastal regions and areas prone to acid rain. They will not red rust. Copper and aluminum are also more malleable than steel and therefore often available in more intricate product designs. Additionally, aluminum and copper typically have much higher percentages of recycled content than steel does.

2. Finishes

The first defense that a metal roof has against the elements is its outer most coating. Such coatings are typically applied to the metal and baked on while the metal is still in coil form. While metals like copper and zinc are usually used in their “mill finish” states, with steel and aluminum products, the following coatings are common:

Rest assured that, when you purchase a Classic Roof , all of the above critical things related to metals and finishes have already been taken into consideration to deliver you the best possible roof that meets your requirements for durability, beauty, energy performance and minimizing the ongoing operational costs of your home.

You can find more information, and contact me directly with your questions about roofing metals and finishes at .

I encourage you to contact our team of metal roofing experts at 1-ob体育官网登录 whenever we can answer any questions you may have or connect you to one of our knowledgeable, independent, expert roofing contractors in your area.

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