Apr 2011

www.colourcoil.com

   Volume 6, Issue 2   

Editor's Note

After much discussion on cool metal roofs (CMR), it is only right to present to our readers some  case studies to show that indeed CMRs do save energy costs. For this issue we will examine a test case conducted for two identical schools in the U.S, one with a non-solar reflective roof and the other with a solar reflective roof.

We would also like to take this opportunity in this month's issue, to also examine Colourcoil specification sheets in a bit more detail. Our readers can then compare the different specifications which are available for each of our high performance pre-painted steel products.

As a designer or a home owner who is about to specify or install a new metal roof, we believe you should compare and properly specify your metal roof material specifications so you end up with a roof that will perform to your expectation.  

Thank you.

Jim
Team leader & Editor
Editor@colourcoil.com
www.colourcoil.com

 

_______________________

Cool Roofing Metals


Click here to find out more

______________________

Previous e-Newsletter

Vol 5. Issue 4 Aug 2010
Vol 5. Issue  5 Oct 2010
Vol 5. Issue 6 Dec 2010
Vol 6. Issue 1 Feb 2011

Click on Articles of interest

a) GOOD DESIGN - Dissimilar
     (i.e. incompatible) Materials

b) Technical Journal - Steel
   Cladding for Animal
   Confinement Buildings

c) Beautiful Metal Roofs -
   Bungalow, Petaling Jaya

d) Beautiful Metal Roofs - The
    Gardens Midvalley, Kuala
    Lumpur

e) Energy Savings with Cool Metal
    Roofs

f) Urban Heat Island (UHI) & cool
   metal roofs

g) IKRAM Certification

h) Colourcoil recognized as an
    ENERGY STAR PARTNER

i) Radiative properties of cool
    metal roofs

j) Meeting Energy Star Solar-
    Reflective Roofing Requirements

k) Kynar 500 Resin is the best
    choice for "cool metal roofs"

l) What is a Cool Metal Roof

m) We are ISO9001:2008 certified

n) Strong value for green buildings

o) Colourcoil Kool colour charts -
    What's new inside

p) Green Building Index - Solar
    reflective index (SRI)
  
 requirements for roof

q) Cool Question - How does solar
    reflectance of metal roofing
    compares to other roofing
    material

r) Why cool metal roofs are way
   cool?

s) What are solar infrared-reflective
    pigments?

Click here to view archives

_________________________________

Contacts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

www.colourcoil.com
info@colourcoil.com

 

 

ARTICLES
(1)
Case Study #1 - Cool Metal Roof Saves Energy Costs
(2) Colourcoil
product Specification sheets - What's inside
(3) Why is Metal Roofing considered “Green”?

(4) Need more Info?

MEDIA

Click here

Case Study #1 - Cool Metal Roof Saves Energy Costs
This case study involves a retrofit for energy conservation using cool metal roof technology in Paulding County, GA, USA.

In 2002-2003, the Paulding County (Georgia) school district built two new elementary schools: Bessie L. Bagget Elementary and Lillian C. Poole Elementary. The schools were nearly identical: same size (90,000 square feet), same HVAC (heating, ventilating and air-conditioning) units, and the same orientation to the sun. Both have metal building systems for the gym and cafeteria. The remainder of each school uses conventional structural steel with metal purlins and a metal roof.

It was proposed that the schools be used to study the value of cool roof technology. The goal was to see if one roof was truly more energy efficient than another. Poole Elementary was constructed with a metal roof that contained a full strength 70% Kynar 500-based (PVDF) coating that used an infrared reflective pigment (reflectivity of 0.29). Baggett Elementary was built with a metal roof that had a non-cool Kynar (PVDF) coating (reflectivity of 0.12). The roofs are both the same dark-green color. To preserve an ideal comparison of energy consumption in the schools , the two schools’ thermostats were set at the same temperature and controlled at the administrative building.


Lillian C. Poole Elementary Powder Springs, GA
Cool Metal Roof, Solar Reflectance 0.29

Bessie L. Baggett Elementary Dallas, GA
Conventional Metal Roof, Solar Reflectance 0.12

The two buildings opened in November 2003. After the first full year of use, the cooling and heating costs were evaluated, with electricity and gas heating bills from the utilities. The reduction in cooling costs from the cool Hunter Green roof far outweighed the heating penalty from more gas heating that was required. The overall cooling/heating savings on an annual basis exceeded $8,000 based on the price of energy at that time with the cool roof of identical color.

Never-before published information from the utility company serving the school district now reveals that after the fourth year of use, the Poole School featuring the solar reflective roof was saving approximately $15,000 in electricity and gas costs, at the present price of energy, compared to the Baggett school building. This amazing difference verifies the claims of the energy cost savings with cool metal roofing. Four years after the roof was installed the savings are more than keeping pace with the escalation of energy costs in that region.

Baggett School Versus Poole School, Energy Savings

Greystone Power
(2006-2007)

Baggett SR (12%)
 Cost

Poole SR (29%)
Cost

Total/Annual
Savings

Annual Electric

$88,352

$78,045

$10,307

Annual Gas

$24,989

$20,800

$4,189

Annual Cost

$113,341

$98,845

$14,496

Assuming that the projected lifetime of the coating is 30 years (even though the warranty maybe for 20 years against colour fading) , a total savings of $450,000 is achievable, not including the likely increase in fuel prices.

Over the past four years, the cool metal roof has retained its color stability and excellent solar reflectance property. The low coefficiency of the PVDF coating allows the roof to shed dirt through natural rainfall and preserve the performance characteristics of the roof. This reinforces that cool metal roof IS IN FACT a sustainable passive energy-efficient product.

Today, after four years of dedicated monitoring, the reflective cool metal roof is proving the point. More importantly, the annual operational cost reductions are substantial enough to provide tens of thousands of dollars to the school district to purchase needed equipment, programs and educational materials that otherwise may not be available.

The savings represent real money that the school district enjoys right now. The roof continues to pay them back, and as the cool metal roof is expected to perform for many years, the life-cycle cost of the roof will remain very low while keeping the occupants very comfortable. This is a true testimonial to the proven tangible cost savings made possible with cool metal roofing. It is obvious, the energy savings effects of cool metal roofs would be more pronounced in countries with warmer climates like Malaysia.

Do not wait any longer. For your next metal roofing project, specify COLOURCOIL® KOOL energy-efficient solar reflective pre-painted steel.

 [ Back to Top ]

 

Colourcoil Product Specification Sheets - What's inside
Colourcoil product specification sheets describe in detail the type of coating used as well as the results of tests conducted in accordance with the relevant ASTM standards. It is imperative that you compare test results of other competitor's products with ours, so you get the type of performance for what you paid for.

One important detail to look at is the allowable colour change over a specified time. In the example above, "A light silver colour, Metallic PVF2 Series, will not fade more than 6 units delta E over a period of 20 years". This forms part of our color fading warranty to our customers who use our pre-painted steel for their metal roofs.

High Performance pre-painted steel
(KOOL energy - efficient, solar
reflective roofing metals)

Warranty* against colour fading, chalking and delamination Warranty* against corrosion Product Specification sheets

 COLOURCOIL®  PVF2 SeriesTM 20 yrs 25 yrs
click here

 COLOURCOIL®  METALLIC PVF2 SeriesTM 20 yrs 25 yrs
click here
 * Terms & conditions apply

For your next metal roofing project, ask your metal roofing manufacturer what type of warranty is he giving for colour fading. You should ask for, (1) warranty period & (2) maximum colour change delta-E values during warranty period.

Click here to learn more about quantifiable warranty and colour change.

 [ Back to Top ]

 

Why is Metal Roofing considered “Green”?
This short article is featured here because one of our marketing staff overheard a conversation of someone asking whether asphaltic roof shingle maybe considered "green" or not.

The largest use of petroleum asphalt is for making asphaltic concrete for road construction and accounts for approximately 80% of the petroleum asphalt consumed. Roofing shingles account for most of the remaining 20% of asphalt consumption. Every year over 13 billion pound of asphalt shingles go into land fills, which could all be prevented because metal roofing is:

  • 100% Recyclable at the end of it’s lifespan

  • Metal roofing has a lifespan 2-3 times as long as shingles

  • Metal roofs already have recycled content of 20-30%

  • Steel is the most recycled material

  • Shingle Roofs are made up of more oil and raw materials (see chart)

But what about rainwater? Is there more pollution from a metal roof or a shingle roof? The answer is shingle roofing is more toxic because:

  • Shingle roofs have a permeable surface and rain water washes away the oils and particles that rise to the top of the shingle as the shingle drys out

But what about solar reflectance and insualtion? Which roof is more energy efficient? Metal roofing is more energy efficient because:

  • Metal roofs are coated to reflect sunlight and have infrared pigments to keep the roof cool in the summer

  • Metal roofs are also much thinner and have less mass which means they hold less heat given them a higher emissivity

  • In some countries such as U.S, metal roofs are tax credit eligible for rebate!

And finally, what about integrating solar? Metal roofs are the best option for solar because:

  • You can go with traditional solar panels using special brackets which requires no roof penetrations or

  • You can go with solar thin film, an aesthetically pleasing and extremely durable option

[ Back to Top ]
 

Need more info?
Whether you are an architect, engineer, developer, house owner or a metal roofing or wall cladding manufacturer, our marketing team will be most delighted to discuss with you on your specific product requirements.

If you wish to make a factory visit, obtain a free brochure or complete specifications and colour charts, please contact our courteous and friendly marketing staff by calling the nearest office or just drop us an email at info@colourcoil.com.

[ Back to Top ]