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Metal roofing is a reliable commercial
roofing system that offers a myriad
of competitive advantages over other
systems. Available in a variety of
profiles, pigments, and textures,
metal roofing affords architectural
appeal and durability. It is a flexible
roofing material in both steep-slope
and low-slope systems, and is perhaps
the most effective source of protection
against fires and adverse weather
conditions. With minimal life-cycle
costs, metal roofing is the selected
surface for cost-conscience operations
including government and industrial
facilities.
Metal roofing generally qualifies
as a cool roof system and provides
solar reflectance of over 70%, allowing
the roof surface to maintain a reasonable
temperature. Additionally, cool metal
roofing is an effective way to mitigate
the "urban heat island"
effect. In fact, metal roofs are highly
respected by the Environmental Protection
Agency's Energy Star Roof Products
Program and a significant part of
the California Energy Commission's
Cool Roof savings program.
Given their durability, metal roofing
systems can last up to 30 years and
experienced commercial insurance professionals
can find additional savings on corresponding
policies.
| Advantages
of Metal Roofing Systems
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| 1. Durability reduces
maintenance costs
over 30+ year life
span. |
| 2. Achieves California's
Title 24 cool
roof requirements.
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| 3. Weather resistance
to wind, hail, ice,
snow, and heat. |
| 4. Lighter than
most non-metal roofing
membranes. |
| 5. 100% recyclable
at the end of its
useful life. |
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There are two general categories
of metal roofing systems: architectural
metal roofing and structural metal
roofing. Generally, architectural
metal panel roofing systems are water
shedding roof systems, usually intended
for use on steep-slope roofs. Structural
standing seam metal panel roof systems
are used on both low and steep-slope
applications. Structural standing
seam metal panel roofing is applicable
for use on low-slope roofs due to
its hydrostatic (or water barrier)
characteristics.
Architecturally, metal panel roofing
systems are typically designed to
be used on steep enough slopes that
will shed water rapidly off the metal
panels' surface, so typically the
seams are not watertight. Many of
the architectural metal roof systems
are well-suited for use on roof slopes
of 3 inches-per-foot (25%) or greater.
One exception to the general slope
guidelines for architectural metal
panel systems is the traditional flat
seamed, soldered, or welded metal
(e.g. copper) roofing. It may be specified
on slopes less than 3 inches per (25%).
Solid roof sheathing or decking is
required for architectural metal panel
roof systems, and underlayment is
recommended.
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A Siplast membrane, Veral, was
used as flashing to provide long-term
protection in the areas where the roof
tends to deteriorate the most. Veral
is a metal clad system, combining glass
scrim-reinforced SBS-modified asphalt
base with a protective foil facing. |
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Madsen
Roofing specializes in
commercial and industrial
applications, in addition
to doing a lot of spec
work for consultants.
About 60% of the company's
work is built-up and modified,
20-25% is single ply and
the rest is metal and
shingles.
Several
years ago, Madsen Roofing
responded to short notice
to start a roof replacement
project on a Northern
California high school
in the middle of July.
Interestingly, the project
had to be finished within
5 weeks, a 530-square
foot job that required
the removal of three previous
roofs. The top layer was
single-ply that had been
put on top of two different
layers of built-up roofing
and fiberglass insulation.
One
other detail that had
to be attended to was
an area of the roof that
was adjacent to a steep-sloped
metal section. Snow tended
to slide off the metal
on to the membrane, causing
extensive damage. For
that section of the flat
roof, Madsen Roofing used
two layers of walk pads
over Siplast's Parafor
50, a heavy duty, double-reinforced
modified bitumen sheet,
composed of high-quality
asphalt with a fiberglass-reinforced
polyester mat. [Continue...]
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