stair run

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run, 3
1. In roofing, the horizontal distance from the face of a wall to the ridge of the roof.
2. In stairways, the width of a single stair tread.
3. The horizontal distance covered by a flight of steps.
4. The runway or track for a sash.
5. A small stream of paint flowing vertically on a
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Our stair run had eight treads, so using this formula, we ended up with 11.2 and ordered 14-ft.
This decision would have added about $3,000 to the cost of a new entry-level townhouse because of the extra square footage needed to accommodate the longer stair run.