03/11/2002

Heads Up

New Study Reaffirms Performance Value of Polyiso Insulation

 

For More on Polyiso

For additional information on polyiso insulation or the ESPG study, please visit the website of the Polyisocyanurate Insulation Manufacturers Association (PIMA) at (www.pima.org) or call (202) 628-6558. PIMA is the national trade organization that advances the use of polyiso insulation. Its membership consists of manufacturers and re-labelers of polyiso insulation,  as well as suppliers to the industry.

According to a case study recently released by the Polyisocyanurate Insulation Manufacturers Association (PIMA), Washington, D.C., increasing the thickness of polyiso roof insulation significantly reduces energy costs while providing a positive rate of return on the cost of installation.

The purpose of the case study, conducted by Energy Services Provider Group (ESPG), an independent energy analysis firm in Maryland, was to measure the economic and environmental effects of additional thickness of polyiso roof insulation, over the minimum code requirement. Building energy costs were calculated for buildings in seven U.S. cities: Boston, Chicago, Los Angeles, Dallas, Seattle, Denver, and Atlanta.

The study demonstrated that increasing the thickness of polyiso roof insulation not only provides a positive rate of return on the cost of installation but also reduces energy costs and harm to the environment.

Methodology

The study examined two types of facilities: a retail building and an elementary school. A “model” of each facility, based on a statistical database of 25 years of energy simulations, was referenced. The current ASHRAE 90.1-1999 standards for roof insulation were used as the baseline for the minimum roof insulation requirements.

This database defined the typical retail building as a single-story, 100,000-square-foot structure (two-to-five length/width ratio) with 30-percent glazing. The structure was cooled to 78 degrees F. in the summer and heated to 72 degrees F. in the winter. Unoccupied temperatures were maintained at 90 degrees F. in summer and 55 degrees F. in winter.

This database also defined the typical elementary school as a single-story 65,000-square-foot structure (two-to-five length/

width ratio) with 30-percent glazing. The structure was cooled to 75 degrees F. in the summer and heated to 72 degrees F. in the winter. Unoccupied temperatures were maintained at 90 degrees F. in summer and 60 degrees F. in winter.

Results: Retail Buildings

Generally, the study found that increasing the insulation thickness by 1-inch or more:

• Provides a significant rate of return to users for the financial investment of installing additional polyiso insulation.

• Reduces the costs to facilities on average $2,500 per year.

• Reduces CO2 emissions by thousands of pounds, SO2 emissions by thousands of grams, and NOx emissions by thousands of grams per year.

Results: Elementary Schools

In each city, except for Los Angeles, the ASHRAE specified minimum insulation value equates to 2-inches of polyiso roof insulation. In Los Angeles, the ASHRAE specified minimum insulation value equates to 1-inch of polyiso roof insulation. The study concluded that the environmental impact of these energy savings in elementary schools equates to significant reductions in CO2 , SO2 , and NOX emissions. Due to the unoccupied summer months, the overall energy savings for elementary schools is low. However, the savings in operating costs and energy use are still significant. In addition, users receive a positive rate of return on their investment (see chart).

POLYISO IN ELEMENTARY SCHOOLS
City
ASHRAE 90.1-1999 Thickness
ENERGY COST SAVINGS**/ IRR (%)
INTERNAL RATE OF RETURN
Boston
R15, 2.5"
3"
3.5"
4.8"
$954/ 13.2
$1641/ 12.1
$2086/ 4.6
Chicago
R10, 1.5"
3"
3.5"
4.8"
$357/ 9.2
$1002/ 9.6
$1957/ 5.6
L.A.
R15, 2.5"
2"
2.5"
4.8"
$2608/ 35.7
$3800/ 32.6
$5297/ 13.5
Dallas
R15, 2.5"
3"
3.5"
4.8"
$918/ 12.6
$1559/ 11.5
$2661/ 7.1
Seattle
R15, 2.5"
3"
3.5"
4.8"
$955/ 13.2
$1581/ 12
$2363/ 5.9
Denver
R15, 2.5"
3"
3.5"
4.8"
$748/ 10
$1174/ 8
$2041/ 4.4
Atlanta
R15, 2.5"
3"
3.5"
4.8"
$903/ 12.4
$1515/ 11.1
$2575/ 6.8
**Energy cost savings values listed above represent the reduction in cost per year for increasing the thickness of polyiso roof insulation over the ASHRAE required listed in the previous column.
 


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We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Add highly responsive multi-zone comfort to any building project, in any climate. Our CITY MULTI H2i R2- and Y-Series VRF systems give you flexibility to fit the needs of any building. Enjoy 100% heating capacity at 0°F outdoor ambient, and 85% heating capacity at -13°F outdoor ambient.  For more information, log on to www.mitsubishipro.com


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Add highly responsive multi-zone comfort to any building project, in any climate. Our CITY MULTI H2i R2- and Y-Series VRF systems give you flexibility to fit the needs of any building. Enjoy 100% heating capacity at 0°F outdoor ambient, and 85% heating capacity at -13°F outdoor ambient.  For more information, log on to www.mitsubishipro.com

 
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