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Stevens Iso-2000 is a closed-cell, polyisocyanurate core integrally laminated to heavy black (non-asphaltic), fiber-reinforced felt facers. Stevens Iso-2000 Insulations are specifically recommended for single-ply membrane systems, hot asphalt or coal tar BUR and modified bitumen. Stevens Iso-2000 has a perforated facer on one side for use with hot-applied systems and a non-perforated side for single-ply systems, making this a universally adaptable insulation product suitable for a variety of applications.
Stevens Iso-2000 Tapered Insulation is manufactured in a tapered profile to provide positive drainage while maintaining maximum thermal efficiency. All Stevens Iso 2000 is made with a standard 20-psi formula; however, a 25-psi formula is available.
Panel Sizes
Iso 2000 -- 4 x 8-ft. (122 x 244-cm) panels only
Iso 2000 Tapered -- 4 x 4-ft. (122 x 122-cm) panels only
Compliance
• Federal Specification HH-1-1972/2, Class 1
• ASTM C 1289-95, Type II.
• IBC, BOCA, ICBO and SBCCI Sections on Foam Insulation
Long-Term Thermal Resistance (LTTR)
Long-Term Thermal Resistance (LTTR) is an advanced, scientifically supported method (based on ASTM C 1303-95) of predicting the Long-Term Thermal Resistance of polyisocyanurate insulation products, such as Stevens Iso. LTTR provides specifiers, design professionals, and roofing contractors many advantages, including:
- A Long-Term Thermal Design Value (15
year time-weighted average)
- A better understanding of thermal
performance of foam
- An advanced test method, based upon
consensus standards used by both US and Canada
- A technically supported, prescriptive
method to measure the Long-Term Thermal Resistance (LTTR) of polyiso
foam insulation
- Long-Term Thermal Resistance (LTTR) values are required in the mandatory annex of ASTM C 1289-02
The roofing industry now has a definitive standard for predicting Long-Term Thermal Resistance (LTTR) values. The new Long-Term Thermal Resistance (LTTR) values became effective July 1, 2002 in Canada and January 1, 2003 in the United States. The *Long-Term Thermal Resistance (LTTR) values of the foam were determined in accordance with CAN/ULC-5570. All test samples were third-party selected and tested by an accredited materials testing laboratory.
Stevens Iso 2000 Long-Term Thermal Resistance* |
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| Thickness | LTTR* Value | Thickness | LTTR* Value |
| 1.0 | 6.0 | 2.6 | 15.9 |
| 1.1 | 6.6 | 2.7 | 16.6 |
| 1.2 | 7.2 | 2.8 | 17.2 |
| 1.3 | 7.3 | 2.9 | 17.9 |
| 1.4 | 8.4 | 3.0 | 18.5 |
| 1.5 | 9.0 | 3.1 | 19.1 |
| 1.6 | 9.6 | 3.2 | 19.8 |
| 1.7 | 10.3 | 3.3 | 20.4 |
| 1.8 | 10.9 | 3.4 | 21.1 |
| 1.9 | 11.5 | 3.5 | 21.7 |
| 2.0 | 12.1 | 3.6 | 22.4 |
| 2.1 | 12.8 | 3.7 | 23.0 |
| 2.2 | 13.4 | 3.8 | 23.7 |
| 2.3 | 14.0 | 3.9 | 24.3 |
| 2.4 | 14.7 | 4.0 | 25.0 |
| 2.5 | 15.3 | ||
Click here for additional LTTR information or to use the LTTR Calculator
Stevens Iso-2000 Tapered Insulation |
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| Marking | Nominal Thickness | Slope per Foot | Average R-Value |
| AA | .05 - 1.0-inch | 1/8-inch | 4.5 |
| A | 1.0 - 1.5-inch | 1/8-inch | 7.5 |
| B | 1.5 - 2.0-inch | 1/8-inch | 10.6 |
| C | 2.0 - 2.5-inch | 1/8-inch | 13.7 |
| X | 0.5 - 1.5-inch | 1/4-inch | 6.0 |
| Y | 1.5 - 2.5-inch | 1/4-inch | 12.1 |
| G | 1.0 - 2.0-inch | 1/4-inch | 9.0 |
| H | 2.0 - 3.0-inch | 1/4-inch | 15.3 |
| JJ | 0.5 - 1.25-inch | 3/16-inch | 5.2 |
| KK | 1.25 - 2.0-inch | 3/16-inch | 9.8 |
| Q | 0.5 - 2.5-inch | 1/2-inch | 9.0 |
© Stevens Roofing Systems/JPS Elastomerics 2007. All rights reserved. |