1. Sustainable Design -
Ideas using Metal Roofing

2. Drexel Metals
is a Registered Provider with the American Institute of Architects Continuing
Education Systems. Credit earned on completion of this program will be
reported to CES Records for AIA members. Certificates of Completion for non-
AIA members are available on request.
This program is registered with the AIA/CES for continuing professional education.
As such, it does not include content that may be deemed or construed to be an
approval or endorsement by the AIA of any material of construction or any method
or manner of handling, using, distributing, or dealing in any material or product.
Questions related to specific materials , methods, and services will be addressed
at the conclusion of this presentation.

3. Did you know?
The built environment has a profound impact on our
natural environment, economy, health and
productivity.
• In the United States, buildings account for:
– 36% of total energy use/65% of electricity consumption.
– 30% of greenhouse gas emissions
– 30% of raw materials use
– 30% of waste output/136 million tons annually
– 12% of potable water consumption

5. Now what?
• Design buildings that:
– Reduce Carbon Emissions/Footprint
– Help to reduce Urban Heat Island
– Help to Reduce Peak Energy Demand
– Include Sustainable materials
– Ensure you can monitor Performance using Green
products.

6. Metal Roofing

7. COOL METAL ROOFING
How it works!

8. What is Cool Metal Roofing?
Metal Roofing is Cool
Cool metal roofing is a family of sustainable,
energy efficient roofing products comprised of
unpainted metal and prepainted metal.
It is available in a wide variety of finishes, colors,
textures, and profiles for steep-slope and low-
slope applications.

9. How Cool Metal Roofs works
Solar Reflectance
Emmitance

10. Same technology as the Stealth Bomber
Cool Metal Roofing is Highly Reflective – using Pigment Technology
Metal roofing meets the EPA Energy Star Roof Products Program performance criteria. Metal
roofing is also eligible for other cool roof incentive programs.

12. Cool Metal Roof Vocabulary
Reflectivity – a measure of the
portion of solar radiation that
is reflected away from a
surface
Emissivity - the capacity of
a body to re-emit infrared
energy that has already
been absorbed

14. TSR = Total Solar ReflectanceTSR = Total Solar Reflectance
TE = Thermal EmittanceTE = Thermal Emittance
TSR=0.70
TE=0.87
TSR=0.26
TE=0.87
TSR=0.26
TE=0.87
TSR=0.29
TE=0.84
TSR=0.26
TE=0.87
TSR=0.67
TE=0.87
Reflects 70% Suns Heat Energy
Absorbs 30% of Suns Heat Energy

15. New IR Pigments = Less Heat = Energy Savings
SR = 14% SR = 26%

16. GA School board saves!
• Two identical buildings with same exposure, no
shading.
• Thermostat control at board office.
• Only One variable:
• Both schools used same color: Forest Green
– One roof has a TSR of 12% –
– One roof has TSR of 29% – energy star approved.
– NET SAVINGS: $ 8200.00 per year
– Expected life of the roof – 45 years –
– Realized savings of $ 369,000 over its useful life with no
required maintenance to the roof!

18. Reduce Urban Heat Island!

19. Life Expectancy
Based on a study conducted by Ducker in 2003, metal
roofs have a significantly longer expected service life
than either asphalt or single-ply roofs. According to
Ducker findings, metal roofs are expected to last 17
years longer than asphalt and 20 years longer than
single-ply.
Expected Roof Life Years
• Metal: 40
• Asphalt:23
• Single-ply:20
Due to its credible long life and documented durability,
metal roofing makes an attractive investment.

20. Energy Performance

21. Life Cycle

22. Life Cycle Cost
• According to Ducker’s 2004 research study,
the life cycle cost of a metal roof is
significantly less than an asphalt or single-ply
roof.
• The expected life cycle cost of metal roofs
reported in this study is 30 cents per square
foot per year, asphalt is 37 cents per square
foot per year, and single-ply roofs is 57 cents
per square foot per year.

23. Little to no maintenance

24. Little to no Maintenance

26. Other Cool Roofing facts
• Cool Metal Roofing is Very Durable
– Metal roofs are credibly proven to last over 30 years with
minimal maintenance. Metal roofs are documented to resist
wind, hail, fire, and earthquakes. Painted metal roofs retain 95%
of their initial reflectance and emittance over time.
• Cool Metal Roofing has Recycled Content and is Recyclable
– Metal roofs typically have a minimum recycled content of 25%.
Metal roofs are 100% recyclable at the end of a long, useful life.
• Cool Metal Roofing is Aesthetically Pleasing
– Metal roofing is available in a wide range of finishes, colors and
profiles, giving architects extensive design flexibility.

27. Metal Roofing and LEED

28. USGBC
The U.S. Green Building Council (USGBC) is the nation’s foremost coalition of leaders from
every sector of the building industry working to promote buildings that are
environmentally responsible, profitable and healthy places to live and work.
• Leadership in Energy and Environmental Design (LEED)
– Green Building Rating System™ is the nationally accepted benchmark for the
design, construction, and operation of high performance green buildings.
– LEED gives building owners and operators the tools they need to have an
immediate and measurable impact on their buildings’ performance.
– LEED promotes a whole-building approach to sustainability by recognizing
performance in five key areas of human and environmental health:
sustainable site development, water savings, energy efficiency, materials
selection, and indoor environmental quality.

29. How can cool metal roofing qualify in LEED?
C
l
i
c
k
t
o
u
p
d
a
t
e
S
R
I
Cool metal roofing can qualify for 1 point within LEED-NC Version 2.2,
Sustainable Sites Credit 7.2, Heat Island Effect: Roofing by using roofing
materials that have an Solar Reflective Index (SRI) rating minimum of 78 for
low sloped roofs (≤ 2:12) or a minimum of 29 for steep slope (> 2:12).
To see if your cool metal roofing product can achieve the SRI minimum
number, visit the LBNL SRI Calculator. You’ll need to know the Solar
Reflectance and Thermal Remittance number to obtain the SRI value.
Download SRI calculator.

31. • Materials & Resources
– MR Credit 1.1 Building Reuse: Maintain 75% of Existing Walls, Floors & Roof
– MR Credit 1.2 Building Reuse: Maintain 95% of Existing Walls, Floors & Roof
(When a building is renovated for reuse, existing metal roofing can qualify.)
– MR Credit 2.1 Construction Waste Management: Divert 50% from Disposal
– MR Credit 2.2 Construction Waste Management: Divert 75% from Disposal
(When a building is demolished, existing metal roofing is easily recyclable.)
– MR Credit 3.1 Materials Reuse: 5%
– MR Credit 3.2 Materials Reuse: 10%
(When a building is demolished, existing metal roofing might be reused.)
– MR Credit 4.1 Recycled Content: 10% (post-consumer + ½ pre-consumer)
– MR Credit 4.2 Recycled Content: 20% (post-consumer + ½ pre-consumer)
(See “Steel Takes LEED With Recycled Content” at www.recycle-steel.org)
LEED POINTS - METAL ROOFING

32. LEED POINTS - METAL ROOFING
• Sustainable Sites
– SS Credit 7.2 Heat Island Effect: Roof
(Selected painted metal roofing can meet the solar reflective index value.)
• Water Efficiency
– WE Credit 1.1 Water Efficient Landscaping: Reduce by 50%
– WE Credit 1.2 Water Efficient Landscaping: No Potable Water Use or No Irrigation
– WE Credit 2 Innovative Wastewater Technologies
– WE Credit 3.1 Water Use Reduction: 20% Reduction
– WE Credit 3.2 Water Use Reduction: 30% Reduction
(Metal roofing can easily be applied to captured rainwater systems for building use.)

33. LEED POINTS – METAL ROOFING
• Energy & Atmosphere
– EA Credit 1 Optimize Energy Performance
(Cool metal roofing can be modeled to show the impact of reduced heat gains.)
• Indoor Environmental Quality
(Metal roofing can help ventilation and day lighting and provide low VOC substrates.)
• Innovation in Design
– RENEWABLE ENERGY CREDITS

34. Metal Roofing and Solar

35. What Does a 100kW PV System Mean?
SUNRISE SUNSET
•As the sun rises the photovoltaic
cells begin to produce electricity at
a low level
•At noon a 100kW system is
producing at its optimum output
•In California the average 5 peak
sun hours a day
•Therefore, we could say that this
100kW system produces
500kWh/day (100kW x 5 hours =
500kWh)
•Depending on your energy usage
profile a 100kw system could
produce all or part of your total
energy needs

37. System Design

38. Net Metering
• Under State NET METERING agreements The PV power is
connected to run your meter backwards with the energy you
produce.
• The local utility and the third party monitoring company track
each kwhr your system produces
• Credits are issued monthly by the utility for energy produced
• Credits cannot exceed your historical usage annually.
• Performance based incentives are monitored and paid to the
system owner utilizing this process.

39. Cash Flow and Breakeven

40. How is the Energy Production
Monitored?
• Third party companies provide web based real
time monitoring capability.
• Service cost is integrated into project O&M
cost.

41. Full System Design

43. One Step Further

44. Thermal System using Copper SS

45. METAL ROOFING, SOLAR AND THERMAL HOT WATER
USING HEAT TRANSFER

46. Solar Monitoring

47. In the Press

48. Questions?
Comments?
Concerns?