ICYNENE INC.

To    : ICYNENE LICENSED DEALERS
From: Ed Reeves, Engineering Manager
Date : September 22, 2003
Re : Icynene® Performance Approvals

In addition to our May 1, 2003 ICC Evaluation Service Legacy Report, NER-420,
Icynene has conducted additional testing to further expand the range of product
performance approvals. Koffel Associates, Inc, our Fire Protection Consultants, has
evaluated the test data. Their engineering recommendations for application and use of
the product are outlined in the four attached letters. A brief explanation of the intent of
each letter is provided in the details that follow:
EIGHT INCHES OF ICYNENE® CRAWL SPACE AND ATTICS
Our NER-420 report limited the thickness of Icynene® in attics/ crawispaces to 6".
We have since completed additional testing and passed with an 8" application of
uncoated Icynene® to the underside of the top of the space.
EVALUATION OF MODIFIED ROOM CORNER TEST ICYNENE® USED TO
INSULATE THE RIM JOIST

Previously, when spraying rim joists, a 15-minute thermal barrier was required over
Icynene®. New test data indicates that when a 3.5" thickness of Icynene® is used in
a rim joist application, a 15-minute thermal barrier is not necessary. The insulation
can be left uncoated.
USE OF ICYNENE® FLEXIBLE FOAM IN NON-COMBUSTIBLE CONSTRUCTION
We have received some enquiries about whether the International Building Code
would permit the use of Icynene® in buildings classified as Type I and II
Construction (i.e. non-combustible construction). In response, Koffel Associates has
conducted an assessment and concluded that the IBC allows the use of Icynene® in
these types of buildings.
USE OF ICYNENE® FLEXIBLE FOAM ON THE FLOOR OF ATTICS
Testing was conducted to confirm that Icynene® does not require a thermal barrier
when sprayed to the floor of the attic. Koffel Associates evaluated the test results
and confirmed that neither a thermal barrier nor an ignition barrier is necessary in
this application.
Please refer to the attached letters from Koffel Associates, our Fire Protection
Consultants, which address the above-mentioned issues.