Denver, Colorado (12/16/2002) --- The Johns Manville Roofing Systems Group has developed an educational package to assist designers, specifiers and contractors with understanding the newly adopted long-term thermal resistance values (LTTR) of polyisocyanurate (polyiso) foam roof insulation. The new method of testing is a major improvement in the way roof insulation is specified and purchased. The package also describes new zero-ozone depleting products used in the production of polyiso insulation.
LTTR represents the most advanced, scientifically supported method to describe the time-weighted average R-value of a roof insulation product over 15 years. Technology has changed and the science of thermal measurement has advanced. Accordingly, more descriptive measures of long-term thermal performance have been developed to calculate and ensure the energy savings provided by insulation over time.
As of January 1, 2003, the currently used PIMA 101 standard will be replaced with the new LTTR values. Specifications being prepared now should include both LTTR R-value and the new thickness. Project specifications prior to January 1, 2003 must be reviewed and the desired thermal performance determined. Thickness can no longer be the sole criteria in a thermal performance specification.
Additionally, the Montreal Protocol established a time-frame to phase-in less ozone depleting chemicals which are used to manufacture many products including polyisocyanurate insulation. Polyiso insulation is manufactured using three basic components-polyol, isocyanate and a blowing agent, which is the ingredient that enhances the thermal performance of the foam. Advances in product chemistry have resulted in a new generation of blowing agents called pentane. Accordingly, the plastic foam insulation industry is phasing in new non-chlorine containing products. Details of new pentane produced products are included in the information kit.
To assist with this transition, Johns Manville has prepared a comprehensive package that includes background data, conversion tables, CD-ROM and other materials. To obtain the free package, call 800.654.3103.
Johns Manville, a Berkshire Hathaway company, is a leading manufacturer and marketer of premium-quality building and specialty products. In business since 1858, the Denver-based company has sales in excess of $2 billion and holds leadership positions in all of the key markets that it serves. Johns Manville employs approximately 9,500 people and operates 52 manufacturing facilities in North America, Europe and China. Additional information can be found at www.jm.com.
