How long has Stone-Coated Steel roofing been around?
Stone-coated steel roofing occurred during World War II when tar and sand were used to cover galvanized steel bunkers. After the war, the practice was commercialized and the first roofs were produced. Stone coated steel roofs have been protecting buildings for close to 50 years, but the product technology today bears little resemblance to early practices due to advances in the chemistry of coatings.

Will a Steel roof make my home hot?
No. A properly vented steel roof system moves air both between the shingles and the underlying deck as well as moving air from vents under the decking. Heated air is allowed to dissipate through the ridgeline as cooler air is drawn through eave vents. Reduced energy bills can result from airflow both under and over the decking.

Can you walk on a steel roof?
Yes. Some care must be exercised while walking on the roof, but note that roofers walk all over the shingles during the installation process.

Is a steel roof noisy in the rain?
Contrary to popular belief, when installed over solid decking a metal roof is not noisy when it rains. In fact, according to one study, a metal roof's noise levels are about the same as other products like asphalt shingles, wood shakes, or clay tiles. The idea that metal roofing is noisy most likely comes from installation over open framing. An open framed installation does increase the noise a metal roof creates.

How wind resistant is a steel roof?
The Metro roofing system has been proven to resist wind speeds in excess of 120-mph. One homeowner's roof survived tornado force winds completely intact. "We lost 12 large trees…the shingled roof of our garage…a 14' X 14' (2" X 6") pump house deck slammed into the house and buckled the brick. You said it would hold up in a tornado. I'm writing to tell you it will." Bill Jamieson

How do the granules stay bonded to the steel?
Specially graded, non-oiled stone chips, produced by ISP Corporation, are used for all Metro stone-coated products. The finely graded, non-oiled stone granules ensure long-term adhesion to the steel substrate and are embedded in a UV resistant acrylic polymer for a lasting bond to the steel substrate.

Will a steel roof rust?
The steel substrate is protected from corrosion by layers of metallic and polymer coatings. Metro utilizes an advanced metal composite developed by BIEC International and introduced in 1973 as aluminum-zinc coated steel. The composite improved earlier metallic coatings by applying an aluminum-zinc alloy to the steel in a continuous hot dip process. The aluminum creates an inert barrier coat while enhancing the long-term performance of zinc and its ability to protect breaks in the coating.

Galvalume coated steel has repeatedly been shown in industry studies, conducted over the last 20 years, to outperform the corrosion resistance of other coated metals. This is why the Metro roof system is referred to as "The final Roofing System", and is backed up with a 50 year limited warranty.

Does the color fade?
Though sized more precisely, Metro uses the same stone granules used by asphalt shingle manufacturers for over 50 years, so history demonstrates that fading is not a problem. Over time, a slight change in color may occur due to settling of airborne contaminants, however periodic rain or washing the roof with a garden hose will keep the roof looking new.

Is a steel roof fire safe?
Steel roofing is classified as a noncombustible roofing material (Class A). In new construction and in many re-roofing applications the metal roofing system is a Class A noncombustible roof assembly. In roof-over applications, where Metro panels are installed over old combustible shakes or shingles, the resulting roof assembly can be classified as A, B, or C depending upon the type of underlayment installed between the old and new roof.

There are many examples of the safe fire performance of stone-coated steel roofs in areas subjected to fire storms. Additionally, the lightweight strength of the steel roofing system precludes it from crashing down on occupants exposed to fire within their residence.

How long does it take to install a steel roof?
Usually only a few days. The complexity of the building's roofscape is the primary factor in determining the time required. Complex roofs require more time than basic designs.

What is the installed weight of a steel roof in comparison to other products?

PRODUCT WGT. PER SQ. (1-Sq. = 100 Sq.ft)
Steel Roofing 125 lbs.
Standard (3-Tab) Asphalt Shingles 190 — 215 lbs.
Wood Shake/Shingle* 250 — 300 lbs.*
Heavy Weight Laminated Asphalt Shingles 290 — 430 lbs.
Clay / Concrete Tiles* 900 — 1200 lbs.*

*Note that the weights for cedar, clay and concrete products are all dry weights. All three-product categories weights increase when

How much protection does a metal roof offer?
Fire: metal will not burn or support combustion.
Wind: experience during hurricanes has shown that metal roofing greatly outperforms other roofing products.
Water: a metal roof offer superior protection against moisture penetration, greatly reducing the chance of damage to the structure.
Hail: hail will not penetrate a metal roof.

Is it necessary that my present roof be removed before a metal roof is installed?
In most applications over asphalt shingles, our metal roofs can be applied over old roof with 30lb felt underlayment or 1' x 4' lathing boards installed between the existing roof and the new metal roof. This saves money and time. In addition, because there's no old roof to remove, landfill space is spared, helping to protect our environment.

How can a metal roof save money on energy bills?
Metal roofing reflects the majority of the sun's rays, so it doesn't retain as much heat as wood, asphalt shingles, tiles, or cement.

How long will a metal roof last?
A metal roof will last far longer than conventional roofing products. Metal roofing has been successfully used for centuries. Our metal roofing comes standard with 40 to 50 year warranties, and is expected to last far longer than that.

Are steel roofs more susceptible to lightning strikes?
Steel roofing is no more susceptible to lightning than other roofing materials. It has been demonstrated that lightning strikes most frequently the highest points of terrain. Where concerns exist, lightning rods can be installed on roofs that are the highest point of surrounding terrain.