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Quizzical Pursuit
—The Architecture Puzzler
Created by Dave Guadagni
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Solution to Last Week's Puzzler
Architecture Puzzler #262
Question
Commonly, in nonresidential construction, stairs are designed to have a 7-inch (178-millimeter) riser and an 11-inch (279-millimeter) tread. If you used a 6-inch (152-millimeter) riser, what would you expect the tread length to be? How about the tread length for a 5-inch (127-millimeter) riser?
Answer
The formula [two times the riser height + the tread length = 25 inches (635 millimeters)] is often used in designing stairs. A stair with a 6-inch (152-millimeter) riser would have about a 13-inch (330-millimeter) tread, a 5-inch (127-millimeter) riser would mean a 15-inch (381-millimeter) tread.
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Dave Guadagni, AIA, is an architect with Robertson/Sherwood/Architects
Quizzical Pursuit is Copyright 2005, Dave Guadagni.
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Grand staircase of the British House of Commons.
Image: www.arttoday.com
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