Below is an excerpt from the study prepared by Warnock Hersey International Inc., P.O. Box 981, Antiloch, California 94509.
Fire resistance report for Covington Brothers IMPAC PANEL construction systems
One inch of cement stucco on each side
And half an inch of plaster on each side
INTRODUCTION
On February 1, 1979, the Antioch Fire Testing Laboratory of Warnok Hersey International Inc. conducted the “Standard Fire Endurance and Lose Stram Tests” according to ASTM E-119 (1976) at the Covington Brothers IMPAC panel…
…The test panel was subjected to a 123-minute fire resistance test followed by a standard hose stream test while sustaining a live load of 1,200 pounds per linear foot. After the hose stream test was completed, the panel was subjected to double the live load of 2,400 pounds per linear foot.
FIRE TEST OBSERVATIONS
| Elapsed Time | Observations |
|---|---|
|
12 minutes |
A large crack has formed at the top of the east corner of the panel. It appears that the plaster bond has broken, and the plaster is peeling away from the wall face by about 1/4 inch. |
|
25 minutes |
The crack at the top of the east quadrant has increased in length to approximately 4" and is showing gaps of 1/4". There are additional random cracks on the panel faces, but none of them show gaps greater than 1/16". |
|
46 minutes |
The face continues to glow a deep orange. There are no further visual changes. |
|
1 hour 16 minutes |
There are no visual changes |
|
1 hour 31 minutes |
A very light amount of yellow flames at the base of the wall. The cracks in the wall have opened to a maximum of 1/8" with a maximum opening of 1/4". The face of the wall is glowing a deep orange. |
|
1 hour 45 min 30 seconds |
The crack on the plaster face is open approximately 3/16". The face has an orange-yellow sheen. There are no other visual changes.
|
|
1 hour 45 min 30 seconds |
A faint, faint yellow flame approximately 1 ft from the base with flames 3 to 4 inches long, a small amount of black smoke. No other visual changes. |
The fire resistance portion of the test continued for 2 hours and 3 minutes. At that point, the test was completed, and the assembly was prepared for the Standard Hose Stream Test. A hose stream was delivered for 2 minutes and 42 seconds at 30 psi. During the first 20 seconds of the hose test, the exposed face plaster coating fell off the panel, exposing the cement stucco. None of the cement stucco was removed from the assembly. No water penetrated the test assembly.
CONCLUSIONS
As demonstrated in this test, the Covington Impact PANEL system, using 7/8" thick cement stucco faces and 1/2" of lightweight plaster added to both faces, resisted the passage of heat for a period of over two hours. The system will resist the passage of flames or hot gases for this period while sustaining a design load of 1,200 lbs per linear foot. In addition, the system will withstand the action of a standard hose stream after such exposure for two hours based on ASTM Standard E-119 "Standard Methods of Fire Test for Building Construction and Materials."
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