Fire-resistance times of various wall constructions

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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