Sustainable Design Ideas using Metal

Metalcon 2009

Sustainability

• Sustainability– To meet the needs of the present without compromising the ability of

future generations to meet their own needs. Considering social, environmental and economic impacts of your actions.

• Sustainable Design– Design that seeks to reduce negative impacts on the environment and

the health and comfort of building occupants thereby improving building performance.

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

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

NORTH AMERICA'S MOST RECYCLED MATERIAL

• Steel– More steel is recycled each year than all other

materials combined. Two out of every three pounds of new steel are produced from old steel.

– It has an average recycling rate in excess of 50 percent since World War II and over 60 percent since 1970. Last year, over 67 million tons of steel scrap were recycled in the United States.

NORTH AMERICAN STEEL INDUSTRY COMMITMENT TO SUSTAINABILITY

• Operate their business in an efficient and financially sustainable way in order to supply steel products and solutions that satisfy their customers and add value to stakeholders

• Optimize the eco-efficiency of their products through life cycle, including increased resource and energy efficiency in the production of steel and during the use of steel products.

– They are committed to the promotion of the recovery, reuse and recycling of steel products through their support of the Steel Recycling Institute.

• Foster the health and safety of employees in the steel industry and provide healthy, safe and environmentally sound products.

• Build on their knowledge of sustainability and willingly share it with others. They will be open and active in their communications and help steel companies and organizations with the supply chain to implement sustainable practices.

Sustainable Steel

• Steel construction materials contain at least 28 percent recycled steel and are completely recyclable.

• Using steel takes the pressure off renewable resources: a typical 2000-square-foot home requires about 40 to 50 trees, about an acre’s worth, to build with wood.

• With steel, only the equivalent of about six scrapped automobiles are needed.

From this

To this

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

Cool Metal Roofing 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

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.

Little to no maintenance

Energy Performance

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.

Life Cycle

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.

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

• Red bar shows benefit of materials relative to Cool Metal Roof (heating in winter)

• Approximately 1x106 MJ more energy for asphalt vsCMR

Case Study - Energy Consumption

-200000

0

200000

400000

600000

800000

1000000

1200000

1400000

Black

Asp

halt

Asphal

t 2

Coate

d Met

al

Ultra-

Cool Coat

ed M

etal

Clay

Concr

ete

or C

emen

t

MJ

/ C

us

tom

er

Be

ne

fit

Transport

HVAC Natural Gas

HVAC Electricity

Underlayment

Roof Covering Material

Note: one MJ = one 100W light on for 2.778 hours

• 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

-100000

0

100000

200000

300000

400000

500000

600000

700000

Black

Asp

halt

Asphal

t 2

Coate

d Met

al

Ultra-

Cool Coat

ed M

etal

Clay

Concr

ete

or C

emen

t

g S

O2

-eq

uiv

ale

nt/C

B

Transport

HVAC Natural Gas

HVAC Electricity

Underlayment

Roof Covering Material

• Significantly reduced amount of NOx

and SOx

emitted w/Cool Metal Roof

Case StudyAcidification Potential

• The red bars indicates the benefit vs CMR for heating

• Nearly a 63 ton reduction in greenhouse gas emissions

• One tree consumes the equivalent of about 1 ton of CO2 in it’s lifetime

Case Study -Global Warming Potential

-10000000

0

10000000

20000000

30000000

40000000

50000000

60000000

70000000

Black A

sphal

t

Asphalt 2

Coated M

etal

Ultra-C

ool Coat

ed Met

alCla

y

Concrete

or C

emen

t

g C

O2-

equi

vale

nt/C

B Transport

HVAC Natural Gas

HVAC Electricity

Underlayment

Roof Covering Material

Eco Efficiency Analysis: A Life Cycle Assessment of Cool Metal Roofing in the Steep Slope Market

• Metal has a very low Eco-impact relative to other steep slope roofing materials. Cool metal has an even bigger impact by reducing net energy consumption

• The EEA supports the argument that metal is the “Greenest” system available for steep slope/residential markets.

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

METAL ROOFING, SOLAR AND THERMAL HOT WATER USING HEAT TRANSFER

One Step Further

Thermal System using Copper SS

METAL ROOFING, SOLAR AND THERMAL HOT WATER USING HEAT TRANSFER

Solar Monitoring

Questions?Comments?Concerns ?