- 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. top
- 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. top
- Is a steel roof noisy in
the rain?
Metro roofing is
quiet. 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 from where they were standing, but couldn’t hear
any noise from the stone/steel roof directly over their heads. top
- 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 top
- 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. top
- 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.
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). 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. top
- 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. 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.* |
*Note that the weights for cedar, clay and concrete
products are all dry weights. All three-product categories weights increase
when wet. top
- What does hail do to steel
roofs?
Metro panels received the highest
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 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
Metro Shingle
‘As
Easy As It Looks’
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