Denver, Colorado (8/22/2002) --- Johns Manville (JM) has converted its Jacksonville, Florida manufacturing facility to produce poliso foam roof insulations with a non-ozone depleting blowing agent, pentane. As a result of a multi-million dollar effort, JM's Hazelton, Pennsylvania and Bremen, Indiana production locations will soon follow.
As part of its conversion process, Johns Manville Roofing Systems Group adopted an advanced scientifically supported methodology called Long Term Thermal Resistance (LTTR) to accurately predict the long-term-R-value performance of polyisocyanurate insulation. LTTR is the result of the work by designers, end users, researchers and manufacturers to develop a new standard to accurately predict long-term thermal performance. This new standard applies to all permeably faced foam insulation with blowing agents other than air, and provides a technically supported, more descriptive measure of the Long-Term Thermal Resistance of polyisocyanurate insulation and provides a 15-year time-weighted average.
The method used to determine long-term R-values is based on accelerated aging by conditioning thin slices of foam insulation and is based on consensus standards in both the United States and Canada. On January 1, 2003 JM and other manufacturers will discontinue publishing PIMA 101 R-values in favor of the new LTTR.
Once the new standard is adopted, LTTR values will become the only way to specify R-values for polyisocyanurate insulation. Many designers, however, are specifying LTTR values today in an effort to provide their clients with a more accurate design R-value for the roof assembly.
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
