Consistancy In Riser Height Throughout A Run Of Stairs - Carpentry - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum Consistancy in riser height throughout a run of stairs
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01-17-2011, 10:11 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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 01-17-2011, 10:30 AM #2 Civil Engineer   Join Date: Mar 2009 Location: Boston Posts: 5,832 Rewards Points: 5,246 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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 01-17-2011, 07:47 PM #3 recently retired   Join Date: Aug 2010 Location: Seattle Posts: 273 Rewards Points: 280 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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 01-21-2011, 01:50 PM #4 Member   Join Date: May 2010 Location: Kelowna B.|C. Posts: 138 Rewards Points: 75 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
 01-21-2011, 07:40 PM #5 recently retired   Join Date: Aug 2010 Location: Seattle Posts: 273 Rewards Points: 280 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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