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cat ladder, duckboard, gang boarding, roof ladder
A plank with a series of small strips nailed across it; hung on a sloping roof under repair to provide a footing for workmen and to protect the surface.
1. A cat ladder.
2. A wooden walkway across muddy ground, a wet floor, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.