- How long has Stone-Coated
Steel roofing been around?
Stone-coated steel roofs occurred during World War II when tar & 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 over 55-years, but the product technology today bears little resemblance to early practices due to advances in the chemistry of coatings and acrylics. top
- Will a Steel roof make
my home hot?
No. A properly vented steel roof 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 is drawn through eave vents. Reduced energy bills can result from airflow both under and over the decking. top
- 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. top
- Is a steel roof noisy in
the rain?
The combination of dead-air space and the stone coating minimize outside sounds.
One rural couple standing directly under a stone coated steel roof observed that they
could hear the rain striking a metal building about 50-feet away, but couldn’t hear any
noise from the stone coated steel roof directly overhead. top
- How wind resistant is a
steel roof?
Metro roofing panels have 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 top
- How do the granules stay
bonded to the steel?
Specially graded ‘Non-Oiled’ natural granite stone chips, produced by SGI
Corporation are used for all Metro stone-coated products. The granules are
embedded in a UV resistant acrylic polymer for a lasting bond to the steel substrate. top
- Will a steel roof rust?
The steel substrate is protected from corrosion by layers of metallic and polymer
coatings. Metro has 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 a 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 30-years, to outperform the corrosion resistance of other coated metals.
This is why the Metro roofing panel is referred to as “The final Roof”, and is backed
up with a 50-year limited warranty. top
- 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. top
- Is a steel roof fire safe?
Steel roofing is classified as a noncombustible roofing material (Class A). Metro
panels when installed over combustible materials like wood shakes or shingles, the
resulting roof assembly can be classified as A, B or C depending upon the type of
underlay installed between the old roof and new roof. The lightweight (1.5-lbs/Sq-ft)
strength of the steel roof helps prevent roof collapse onto occupants exposed to fire
within their residence. top
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 precludes it from crashing down on occupants exposed to fire within their
residence. top
- How long does it take
to install a steel roof?
Usually only a few days. The complexity of the building’s roof is the primary factor in
determining the time required. Complex roofs require more time than basic designs. top
- 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.* |
*Cedar, Clay & Concrete product weights are all DRY weights, all 3-product weights increase when WET.
**Asphalt Shingle weights DO NOT include the weight of new plywood. OSB sheathing. top
- What does hail do to steel
roofs?
Metro panels have earned a UL Class-4 Impact Resistance rating from Underwriters
Laboratories. Except under the most extreme storms, Metro panels show no visible
effects from impacting hail stones. Some insurance carriers extend a discount on
premiums to homeowners that have a UL Class-4 Metro roof. top
- 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. top
- How does Metro market its product?
Metro sells its products ONLY through wholesale type distributors who in turn sell to
local contractors. top
- I have heard Metro makes other brands?
Metrotile Manufacturing is the production facility that makes the unique profiles for
Metro Roof Products. Metrotile Manufacturing also makes unique products for
distributors that are marketed under that distributor’s own brand name. Metro Roof
Products or Metrotile Manufacturing does not control the marketing, promotion or
warranty to consumers of private label / toll manufactured products through
distributors. top
Smart Roofs for Smart People™
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