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Old 05-28-2008, 08:33 PM   #1
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Deck Stair Requirements


Hello,

My city building inspector tells me that for my deck stairs:

"Risers are 8 1/4 maximum and treads are 9" minimum must be equal. Cannot exceed between minimum and maximum deviation total."

Does this mean that if you have 2- 2x6 as treads (11 inches) that your risers have to be 11 inches? If this is so, then that is more than 8 1/4 max and it will not work.

Can someone make sense of this?





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Old 05-28-2008, 08:59 PM   #2
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Deck Stair Requirements


This just states the risers must be within 1/4" of 8 1/4" MAX" (all the same) Your 11" treads are fine and have no bearing on the risers. As long as you use the 11" treads and keep all risers at 9" or within 1/4" deviation your all set.
A more comfortable riser is 7-7 1/2" but your code just states max as 8 1/4" so you can use from 7 - 8 1/4" risers.

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Old 05-29-2008, 08:57 AM   #3
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Deck Stair Requirements


The tread is what you step on, and is called "run". You're fine with two 2x6's.

The "rise" is the vertical measurement between treads, which is 8-1/4" maximum.

With rise and run, you can't have any two stairs with more that 1/4" variance in rise or 1/4" variance in run. Dimensional consistency!

That's an old code your city is using!
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Old 05-29-2008, 11:49 AM   #4
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Deck Stair Requirements


Just to clarify, tread width is from the riser to the nose. Run is from riser to riser, nose to nose or tread minus overhang. Rise is from top of tread to top of tread.
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Old 05-30-2008, 07:26 AM   #5
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Deck Stair Requirements


Here's a link to a free online stair calculator.
http://www.inspectusa.com/info/calc/...n_stringer.htm

Hope this helps
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Old 06-01-2008, 10:36 AM   #6
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Deck Stair Requirements


Like kctermite said, those are pretty old numbers by modern codes . I'd verify with the inspector again, maybe your locality still allows those high riser/narrow tread combinations on exterior decks/stairs. Most areas are now 7 3/4 max rise and 11 tread, and 3/16" deviation between steps.
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Old 06-01-2008, 07:07 PM   #7
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Deck Stair Requirements


Quote:
Originally Posted by troubleseeker View Post
Like kctermite said, those are pretty old numbers by modern codes . I'd verify with the inspector again, maybe your locality still allows those high riser/narrow tread combinations on exterior decks/stairs. Most areas are now 7 3/4 max rise and 11 tread, and 3/16" deviation between steps.
The current International Code is 7-3/4" max rise, 10" minimum run, and max 3/8" variance.

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