Tag Archives: choose a metal roof

Galvanized Metal Roofs – Why Use G90 or Higher for Residential Roofing?

Galvanized panels are a very popular substrate for metal roofing.  Manufacturers often use terms such as G60 or G90 to describe their products.  What’s the difference? And which should contractors use in various applications?

Galvanized Defined

Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting.  After roofing panels are galvanized, they can be painted or granular-coated.  The grades of galvanized products correspond directly to anticipated field longevity. With galvanized substrates, the more zinc the better. These “G” numbers indicate how many ounces of zinc are applied to each 100 sq. feet of paneling. G60 has 60 ounces, G90 has 90 ounces and therefore provides better corrosion resistance. These numbers are directly related to increased longevity and long-term aesthetics for the roof.

Specifications Defined

The Metal Construction Association has developed a Guide Specification for Residential Metal Roofing that clearly defines which galvanized products should be used on homes. All MRA members must agree to adhere to or exceed the MCA’s Guide Specification for Residential Metal Roofing before they are permitted to join the association.  This same rule applies for both manufacturers and contractors.  For galvanized steel used in residential applications, the MRA recommends a minimum metallic coating of G-90. So, if you’re not sure of the coating of the panels you are installing on homes, it’s in your best interest to find out.  Again, the higher the number, the better protection from rust.

Metal Roof

Why It Matters

“Members of the metal roofing industry are constantly fighting the outdated ‘rusty barn roof’ image, and the Metal Roofing Alliance has made great progress in educating consumers about today’s beautiful, long-lasting metal roofing options.  Every bad roof installation is a step in the wrong direction,” says MRA’s Executive Director Bill Hippard.

Metal Roofs on Homes should not rust

In a competitive environment, it may be tempting to choose a lower quality (and therefore lower cost) steel panel when installing a new metal roof.  However, for roofers who are looking to build a business and remain in this growing residential market segment, that choice offers short term gain in exchange for long-term pain.  Whenever a lower-quality metal roof is installed, it’s almost certainly doomed for failure, resulting in customer complaints and a damaged reputation for all metal roofs.

Former customers are an excellent referral source, and a happy homeowner will recommend your business to their friends and neighbors.  The opposite is also true – install an inferior product, and you will hear about it as well as those same friends, neighbors and perhaps even the local licensing authorities.

For a list of MRA member manufacturers and the Investment Grade Roofing products they offer for residential installation, please visit our website.

Forbes article Recommends Metal Roofing

Forbes.com just posted an article regarding steps that homeowners can take to reduce energy bills and keep a home warm during the winter. This new story includes a strong recommendation for metal.

In fact, #4 on the list is “Choose a Metal Roof.”  Here’s the link to the full article – metal roofing contractors may wish to share this story with homeowners who are still considering what type of roof to install.

Are You Making These Smart Cold Climate Design Choices  - Forbes

This story is also a great follow up piece for homeowners who have already purchased a roof from your company, as it validates their choice, and includes other energy-efficiency tips.

Contractor Tip:  if you send emails or e-newsletters to your customers, include a link to the story.  You can also share the story via your Facebook or Twitter pages.