There are not many roofing materials that can match the longevity, durability, malleability, flexibility, resiliency, and cost-effectiveness of Zinc.
Not even aluminum or copper! Zinc roofs are known to last for hundreds of years, even in the most extreme environments.
Truly unmatched durability, longevity, and classic beauty — that’s what zinc roofing offers to a homeowner. — At $12 to $15 per sq. ft. installed, it is the kind of value that is simply unmatched in all other roofing materials.
Zinc — Most Amazing Building Envelope Material You Never Heard of!
In the US, the whole idea of using Zinc as a roofing or cladding material for a house may sound other-worldly.
Aluminum and steel dominate residential metal roofing market, while asphalt shingles are by far the most popular overall roofing material.
Did you know? 70% of residential roofs in Europe are covered with Zinc. In Paris, this number goes up to 85%.
via Metal Tech USA
Metal roofing is often chosen for its durability and longevity. All properly designed and correctly installed high-end metal roofs are likely to last at least 50 years.
Yet, in order for that to hold true for Steel, for example, it must be coated with metallic finishes such as G-90 galvanized steel and Galvalume (zinc and aluminum coating), along with high quality paint finishes such as Kynar 500. With Zinc, as well as copper, that is not the case.
Both Zinc and Copper form protective patina, meaning they will not rust nor be adversely impacted by weathering.
Both of these metals benefit from aging, and their patina process.
With Zinc, it starts out dark, as in dark gray / near black and then changes to a patina light gray or bluish color. Zinc can also be painted virtually any color, which serves as a sacrificial layer prior to the patination process.
Did you know? Thanks to Zinc’s naturally-forming self-healing properties, it can provide years of virtually maintenance-free roof and building envelope protection
What makes Zinc truly fascinating is its resiliency. All metal roofs, including Zinc, can be scratched. With Steel, scratches in its coating layer will expose the base material to the effects of oxidation and corrosion.
With Zinc, it actually self-heals. You read that right, Zinc if scratched will self correct.
The protective (patina) layer of Zinc is technically hydroxyl carbonate that will, over time, reform itself and thus eliminate blemishes or scratches. This is one, of a few reasons, why the market for Zinc will often sell pre-patinated Zinc roofing.
As you may have guessed, Zinc is extremely durable. When steel is “galvanized”, it is really just adding a protective layer of Zinc to dteel base to protect it from oxidation, as Steel is naturally corrosive, or will rust when exposed to salt, water, or moist environment over a long period of time. galvanized and Galvalume Steel will forgo that aging for a couple of decades.
Like most metals, Zinc is insect-proof, fire resistant, and mildew / fungus-proof. Zinc also benefits from being non-toxic. Because of its low to non-existence toxicity level, soft zinc is marketed as replacement for flashing material for all roofs.
Back in the day, the traditional material was lead, then steel, but soft zinc, offers virtually the same level of durability with no known toxicity impact.
Did you know? Run-off water from Zinc is considered ‘clear’ or contaminant free, which most metals can’t readily claim. Thus, a zinc roof is a great option for homeowners interested in rain water collection.
Like many other metals, zinc is fully recyclable. Plus, it will reflect solar radiant heat, as most metals do to some degree, which prevents the unwanted transfer of heat from the roofing material into the attic space.
On the contrary: Asphalt shingles gain a lot of heat during the day and transfer much of it inside your home.
Moreover Zinc has even greater environmental value in that it takes less fuel to manufacture it, really to boil it and shape it into finished roofing product.
Did you know? Aluminum and steel use a good two to four times the amount of energy in their production compared to Zinc.
All this value would make you think it’s gotta be at least as expensive as Copper. Nope. Not necessarily.