This page was produced by Steven J. DeRose on 2003-03-29, and was last updated on 2003-03-29.
The information here is derived from a CDC web page here.
Fire resistance ratings for various types of partition wall construction.
| Construction material | Fire resistance rating (minutes) |
|---|---|
| Wood frame covered (both sides) with: | |
| 1/2-inch fiberboard | 10 |
| 1/2-inch fiberboard, flame proofed | 10 |
| 1/4-inch plywood | 10 |
| 3/4-inch T&G boards | 20 |
| 3/8-inch gypsum wallboard | 25 |
| 1/2-inch gypsum wallboard | 40 |
| 5/8-inch gypsum wallboard (type X) | 60 |
| Cement asbestos board 3/16-inch thick | 10 |
| 3/16-inch cement asbestos board over 3/8-inch gypsum board | 60 |
| Masonry construction | |
| 4-inch blocks plastered both sides | 60 |
| 6-inch blocks | 60 |
| 6-inch concrete | 240 |
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