AIA Sustainabilty Metal Roofing
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Transcript of AIA Sustainabilty Metal Roofing
Sustainable Design -Ideas using Metal Roofing
Drexel Metals Corporation
Drexel Metals is a Registered Provider with the American Institute of Architects ContinuingEducation Systems. Credit earned on completion of this program will bereported 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 anapproval or endorsement by the AIA of any material of construction or any methodor manner of handling, using, distributing, or dealing in any material or product.Questions related to specific materials , methods, and services will be addressedat the conclusion of this presentation.
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
THE WORLD ACCORDING TO OIL
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.
Metal Roofing
COOL METAL ROOFINGHow it works!
What is Cool Metal Roofing?
Metal Roofing is CoolCool 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.
How Cool Metal Roofs works
Solar Reflectance
Emmitance
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.
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
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
New IR Pigments = Less Heat = Energy Savings
SR = 14% SR = 26%
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!
Reduce Urban Heat Island!
Life ExpectancyBased 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:20Due to its credible long life and documented durability,
metal roofing makes an attractive investment.
Energy Performance
Life Cycle
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.
Little to no maintenance
Little to no Maintenance
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.
Metal Roofing and LEED
USGBCThe 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.
How can cool metal roofing qualify in LEED?
Click to update SRI
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.
• 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
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.)
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
Eco Efficiency Analysis: A Life Cycle Assessment of Cool Metal Roofing in the Steep Slope Market
Use of products
Extraction of Raw Materials
Processes
Disposal
Recycling
Products
Consider the Total Life Cycle
emissions
Categories for Environmental Impacts
risk potential
toxicity potential
energy consumption
raw materials
EnvironmentalImpact
land use
• Variables:– Location: Los Angeles
– 5000 sq. ft roof
– Materials:• Black asphalt
• Architectural asphalt shingle
• PVDF coated metal roofing
• PVDF Cool metal roofing
• Clay tile
• Concrete Tile
– Color: red/tan (except black asphalt as a base)
Case Study
Case Study Portfolio Summary-0.5
1.0
2.5
-0.51.02.5
Costs (normalized)
En
vir
on
me
nta
l Im
pa
ct
(no
rma
lize
d)
Black Asphalt
Asphalt 2
Coated Metal
Ultra-Cool CoatedMetal
Clay
Concrete orCement
high eco-efficiency
low eco-efficiency
• Metal, especially Cool Metal, uses considerably less oil and natural gas during manufacturing and its useful life
Case Study – Raw Material Use
0
1000
2000
3000
4000
5000
6000
7000
8000
BlackAsphalt
Asphalt 2 CoatedMetal
Ultra-CoolCoatedMetal
Clay Concreteor Cement
kg/(
a*M
io t
)1/2
/CB
Sand
Bauxite
Lime
Iron
Phosphorous
Sulfur
NaCl
Lignite
Gas
Oil
Coal
Metal Roofing and BIPV
BIPV – Building Integrated PV
Uni-Solar/Ovonics has developed light weight, flexible solar panels that can be incorporated directly into roofing systems. These lightweight durable panels provide power output performance characteristics equal or better than their conventional relatives with a significant weight reduction and the ability to produce energy on cloudy days.
Thin Films • Enhanced durability – accepts foot traffic
• Rocks and Hail will not damage out put of solar panels
• Lightweight – no structural reinforcement needed
• Dade County Approved for use in hurricane wind zones
• Performs well in shaded conditions
• Unified 20 year roof/pv warranty
New Technology – Thin Films
PV Laminates and Metal Roofs
PV Laminates and Metal
Metal and Solar
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
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.
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.
Full System Design
One Step Further
Thermal System using Copper SS
METAL ROOFING, SOLAR AND THERMAL HOT WATER USING HEAT TRANSFER
In the Press
Think Green! • Websites:
– www.aia.org/sustainability– www.findsolar.com– www.solarquickquotes.com– www.dsireusa.org– www.drexelsolar.com– www.coolmetalroofing.com– www.unisolar.com– www.usgbc.org
Questions?Comments?Concerns ?