Drexel Metalsis 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 ournatural environment, economy, health andproductivity.• 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
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 Greenproducts.
What is Cool Metal Roofing?Metal Roofing is CoolCool metal roofing is a family of sustainable,energy efficient roofing products comprised ofunpainted 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 worksSolar ReflectanceEmmitance
Same technology as the Stealth BomberCool Metal Roofing is Highly Reflective – using Pigment TechnologyMetal roofing meets the EPA Energy Star Roof Products Program performance criteria. Metalroofing is also eligible for other cool roof incentive programs.
Cool Metal Roof VocabularyReflectivity – a measure of theportion of solar radiation thatis reflected away from asurfaceEmissivity - the capacity ofa body to re-emit infraredenergy that has alreadybeen absorbed
TSR = Total Solar ReflectanceTSR = Total Solar ReflectanceTE = Thermal EmittanceTE = Thermal EmittanceTSR=0.70TE=0.87TSR=0.26TE=0.87TSR=0.26TE=0.87TSR=0.29TE=0.84TSR=0.26TE=0.87TSR=0.67TE=0.87Reflects 70% Suns Heat EnergyAbsorbs 30% of Suns Heat Energy
New IR Pigments = Less Heat = Energy SavingsSR = 14% SR = 26%
GA School board saves!• Two identical buildings with same exposure, noshading.• 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 norequired maintenance to the roof!
Life ExpectancyBased on a study conducted by Ducker in 2003, metalroofs have a significantly longer expected service lifethan either asphalt or single-ply roofs. According toDucker findings, metal roofs are expected to last 17years longer than asphalt and 20 years longer thansingle-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.
Life Cycle Cost• According to Ducker’s 2004 research study,the life cycle cost of a metal roof issignificantly less than an asphalt or single-plyroof.• The expected life cycle cost of metal roofsreported in this study is 30 cents per squarefoot per year, asphalt is 37 cents per squarefoot per year, and single-ply roofs is 57 centsper square foot per year.
Other Cool Roofing facts• Cool Metal Roofing is Very Durable– Metal roofs are credibly proven to last over 30 years withminimal maintenance. Metal roofs are documented to resistwind, 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 andprofiles, giving architects extensive design flexibility.
USGBCThe U.S. Green Building Council (USGBC) is the nation’s foremost coalition of leaders fromevery sector of the building industry working to promote buildings that areenvironmentally 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 thedesign, construction, and operation of high performance green buildings.– LEED gives building owners and operators the tools they need to have animmediate and measurable impact on their buildings’ performance.– LEED promotes a whole-building approach to sustainability by recognizingperformance in five key areas of human and environmental health:sustainable site development, water savings, energy efficiency, materialsselection, and indoor environmental quality.
How can cool metal roofing qualify in LEED?ClicktoupdateSRICool metal roofing can qualify for 1 point within LEED-NC Version 2.2,Sustainable Sites Credit 7.2, Heat Island Effect: Roofing by using roofingmaterials that have an Solar Reflective Index (SRI) rating minimum of 78 forlow 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 minimumnumber, visit the LBNL SRI Calculator. You’ll need to know the SolarReflectance 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
What Does a 100kW PV System Mean?SUNRISE SUNSET•As the sun rises the photovoltaiccells begin to produce electricity ata low level•At noon a 100kW system isproducing at its optimum output•In California the average 5 peaksun hours a day•Therefore, we could say that this100kW system produces500kWh/day (100kW x 5 hours =500kWh)•Depending on your energy usageprofile a 100kw system couldproduce all or part of your totalenergy needs
Net Metering• Under State NET METERING agreements The PV power isconnected to run your meter backwards with the energy youproduce.• The local utility and the third party monitoring company trackeach 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 thesystem owner utilizing this process.