Many of us selecting, designing, manufacturing or installing a roof system are striving to conform to
the sustainability ideal. Forging our way, we often find ourselves entangled in a debate. In roofing,
what is sustainable? Are we achieving it if we paint our black roofs white to save energy? Surely we
are if our roof is reflective. Are our roofs sustainable if we plant landscaped gardens above them and
create space on them for the public to play? How about if our products endure rooftop harassment
indefinitely? Or, are we only really achieving sustainability if we can tear off our old roofs, recycle
and transform them into new roofing products like walkways, tiles or even new roofing membranes?
A crystal clear definition of sustainability is elusive. That’s because, sustainability in general is a
science that is still maturing. Yet, as we chase the ideal, it is easy to lay claims on sustainability
with any enhancement aimed at decreasing the stress of our products on the natural world. But the
effort must go much deeper than that. If sustainability is truly achievable in roofing, companies
must undertake the quest organization-wide. Sustainability requires that we make conscious choices
about resources and the way we use them at every stage of a product’s life.
As a roofing manufacturer, we are actively engaged in this journey. The intent of this article is to
offer our learning as a roadmap for those of you who have a similar destination in mind, but still
find yourselves navigating through fog. The following will be our focus:
Section 1: Sustainability: Defining it for the Roofing Market
Section 2: The Stages and Environmental Impacts of a Roof’s Life Cycle
Section 3: Conclusion
Sustainability: Defining it for the Roofing Market
Living sustainably, according to many, requires that we use resources to meet our present needs
without compromising the ability of future generations to meet their needs. Living sustainably does not, however, require that we live in thatch huts that periodically biodegrade. In fact, a roof that
won’t last is not sustainable at all. Wikipedia agrees. According to the free online encyclopedia, the
definition of sustainability is, simply, “the capacity to endure.”
The most widely recognized definition of a sustainable roof system comes from the Proceedings
of the Sustainable Low-Slope Roofing Workshop
, held at the Oak Ridge National Laboratory in
A roofing system that is designed, constructed, maintained, rehabilitated, and demolished with an
emphasis throughout its life cycle on using natural resources efficiently and preserving the global
People, resources and the environment are all intertwined. In roofing, we have an impact on the
environment when we extract raw materials, manufacture, install, use and dispose of a roof. This is
why endurance counts. A longer lasting roofing system delays the repeat of the manufacturing cycle,
uses fewer resources, costs less money and causes less stress on the environment.
The Stages and Environmental Impacts of a Roof’s Life Cycle
Stage 1: Design
The design stage covers the design and engineering of each component in the roofing system to
meet the market’s needs.
Designers and engineers are the first people who can affect the environmental impact of a product.
Their product and system design concepts can influence the sustainable nature of raw material
inputs. Raw materials that include recycled content or bio-based materials are examples of more
sustainable inputs. Designers can influence production processes, product performance, product
longevity and the product’s end of life options. They also can be involved in product packaging
decisions and impact corresponding landfill waste.
Examples of more sustainable roofing product and system designs:
- A more sustainable roofing product is designed for longevity in a variety of rooftop
environments. Some roofing membranes as well as accessories like adhesives and
insulation are now being made with renewable resources or recycled content.
- A more sustainable roofing system design ensures proper drainage, minimizes maintenance
and excludes items like pitch pans and exposed sealants. These items, if not constantly
maintained, can be the cause of leaks, which in turn compromise the roofing system’s
ability to reach its performance potential.
Stage 2: Material Inputs
The source of all raw materials used to make any product can always be traced back to the natural
environment. In this stage, raw materials are extracted from nature and converted into other
synthetic materials before manufacturing into a roofing product.
The natural resources we select for products, the quantities we use, and the methods we use to
harvest them impact the environment. Minimizing the amount of resources extracted from nature,
especially those that are scarce, makes for a more sustainable product. Creating synthetic raw
materials involves manufacturing processes, which could include chemicals of concern; those that
may be harmful to people and/or the environment. If not handled properly, waste generated by
manufacturing can cause pollution of local land, air and waterways.
Examples of more sustainable material inputs:
- The polymers of almost all modern roofing membranes are made from nonrenewable fossil
fuels. Some products are more fossil fuel dependent than others. A product that uses less
fossil fuel and lasts longer is significantly more sustainable than an alternative product that
uses more energy and has a shorter lifespan.
- Companies making a more sustainable product are making conscious selections of raw
material inputs, and monitoring their supply chain to minimize or eliminate any inputs that
include chemicals of concern, or create environmentally destructive emissions.
Stage 3: Manufacturing
In the manufacturing stage, all of the natural and synthetic materials are brought together to make
the components of a roofing system.
Manufacturing processes generate waste, which, if not handled properly, can cause pollution of air,
land and waterways. Manufacturing also can consume a lot of water and energy and cause stress on
Example of more sustainable manufacturing practices:
Companies striving to achieve sustainability in manufacturing should be able to demonstrate it in
many ways, by doing all or many of the following things:
- Designing and operating manufacturing processes so as to minimize air and
- Minimizing the disposal of solid and hazardous wastes to the environment (e.g. landfill,
incineration) by source reduction, recycling or finding other beneficial uses;
- Identifying opportunities for energy use reduction;
- Incorporating sources of renewable energy into manufacturing (e.g. solar, wind,
biogas, etc.) when possible;
- Putting in place an environmental management system;
- Minimizing the use of water;
- Minimizing the use of chemicals of concern;
- Utilizing raw material suppliers that are achieving a lower environmental profile through
these same actions.
Stage 4: Transportation
Transportation can occur at any point in the life cycle: delivery of the raw materials to the
manufacturing site, shipping of the finished product to the point of installation and the transportation
of the expired product to a landfill or recycling plant.
The majority of commercial transportation vehicles consumes non-renewable fossil fuels, and emits
carbon monoxide. The greater distance between transportation points, the greater the impact on the
Examples of more sustainable transportation:
- Strategically placing stocked warehouses so as to maximize railroads for shipment.
Shipping by rail uses significantly less fuel per ton of freight moved.
- Designing the product to achieve the performance requirements with less weight per square
foot of roof. Less weight translates into fewer vehicles needed to ship.
- Utilizing suppliers local to manufacturing and installation points for raw material inputs
and system accessories.
Stage 5: Installation
In the installation stage, the product is put into place for its intended use in the roofing system.
The selection of accessory items and the methodology required to install a roofing system (adhered,
ballasted or mechanically fastened) contribute to the roof system’s sustainability profile. Adhesives,
primers, cleaners and sealants may include chemicals of concern or exceed recommended VOC
limits. Construction waste, especially fuel and oil spills or leakage from equipment and generators
can pollute land, air and waterways.
Examples of a more sustainable installation process:
Ballasted roofing systems generally require the least intrusive inputs and simplify end of life
removal but have performance limitations in high-wind regions. Mechanically fastened roof systems
are also easily “disassembeled” at the end of the life cycle.
Adhered roofing systems relying on adhesives and bonded composites may contaminate membrane
components and complicate their separation at the end of the roof’s life cycle.
Stage 6: Service Life
The service life is the time period during which a product serves its intended function.
It cannot be overemphasized. The length of a product’s service life has significant environmental
impact. The shorter the lifespan of a product, the more frequent the need for a repeat of the
production cycle; hence, causing greater demand on resources and stress on the environment.
Example of a more sustainable service life:
- Some roofing products use more resources and have a shorter service life. Some use fewer
resources and have a longer service life. The latter is more sustainable. Use the following
indicators when verifying a product’s projected service life:
- The manufacturer can provide documentation of past product performance history in
various climates (e.g. hot and humid or hot and dry, as well as cold, temperate
climates), and performance history in various rooftop conditions (e.g. exposure to
high UV, high wind, and chemicals, oils and greases)
- The manufacturer has in place a formal program to train installers on proper handling
and installation methods for the roofing product;
- The manufacturer can verify the viability of making repairs to maintain the product
as it ages.
Stage 7: End of Life
The point at which the roofing product is no longer fit for its intended purpose.
Products that no longer function can turn into landfill waste.
Examples of more sustainable end of life options:
For the past 20 years, companies have experimented with ways to recycle or reuse their roofing
products to avoid clogging landfills. Over the past decade significant advances in the research
and technology have enabled many companies to do so. Recycled roofing products are being
transformed and used in complementary building applications, such as flooring, tiles and walkways. Some roofing products are actually being recycled and reused again as new roofing products.
Living in or manufacturing biodegradable thatch huts may, to some, sound environmentally
romantic. But, it’s really not practical, nor would it make good use of anyone’s resources or time.
Sustainability requires that there is balance between people, resources and the environment. In roofing, we must be cognizant of all the variables in our work that impact this balance. One product
enhancement will not suffice.
For more information about FiberTite Roof Systems please call Seaman Corporation at
800-927-8578, extension 5953. Ask for Art Marangi.