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Limiting Spans - Horizontal Shaft Walls (Ceiling Applications)

Horizontal Shaft Walls spans are taken from Progressive Engineering Report AER-09038 (pdf). Visit Progressive Engineering Inc. Product Evaluation Reports to learn more.
Visit USG Cavity Shaft Wall System on USG.com

1-Hour Corridor Ceiling and Stair Soffits

Single-layer 5/8" gypsum panels Maximum Span
212CH25-18 8'-6"
400CH25-18 9'-3"
212CH20-34 10'-4"
400CH20-34 14'-11"
600CH20-34 20'-10"

2-Hours Corridor Ceiling and Stair Soffits

Double-layer 1/2" gypsum panels Maximum Span
212CH20-34 7'-7"
212CH25-18 7'-10"
400CH25-18 9'-8"
400CH20-34 14'
600CH20-34 19'-7"

2-Hours Horizontal Membrane or Metal Duct Enclosure

Triple-layer 1/2" gypsum panels Maximum Span
The Horizontal Duct Enclosure system is limited to a span of 5’-4” long. 5'-4"