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Old 01-17-2011, 09:11 AM   #1
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Consistancy in riser height throughout a run of stairs


I know that throughout a run of stairs the smallest to the largest rise can not exceed 3/8 of an inch. My question is from rise to rise what is the greatest difference that you can have? Can you have a difference of 3/8 of an inch?

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Old 01-17-2011, 09:30 AM   #2
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Consistancy in riser height throughout a run of stairs


Page 17 of the Prescriptive Residential Wood Deck Construction Guide states:

Tread and Riser Detail: 7-3/4" maximum riser; height shall not deviate from one another by more than 3/8"

You should check your local code for your specific application.

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Old 01-17-2011, 06:47 PM   #3
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Consistancy in riser height throughout a run of stairs


You answered your own question.

The difference from riser to riser isn't the primary consideration. The max difference between the shorted riser and the tallest riser cannot exceed 3/8" no matter where they are in the flight.
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Old 01-21-2011, 12:50 PM   #4
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Consistancy in riser height throughout a run of stairs


Sounds like some lax codes in some areas. We have a 7-7/8 maximum riser with a 1/8 deviation not surpassing the max. Why not just make them all the same? It is just simple division and layout
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Old 01-21-2011, 06:40 PM   #5
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Consistancy in riser height throughout a run of stairs


Those are from the 2006 IRC. The deviation usually occurs if the floors are out of level. If the first floor is out by over a 1/16" and the top floor is out by the same then unless you can get the BI to measure at the walk line you will be over an 1/8".
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