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Kevin M. Carr 01-17-2011 09:11 AM

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?

Daniel Holzman 01-17-2011 09:30 AM

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.

Keith Mathewson 01-17-2011 06:47 PM

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.

masterofall 01-21-2011 12:50 PM

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

Keith Mathewson 01-21-2011 06:40 PM

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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