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Thread: 2009 IRC stair treads and risers

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    Sawhorse skipharper's Avatar
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    2009 IRC stair treads and risers

    In Virginia every time the new code is adopted we continue to ammend the stair rise and tread to read different from what is in the current IRC. (Less restrictive) Are any other States doing this to your knowledge?

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    Sawhorse
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    I believe CT does also...
    Please support Jim Brown, Deputy Building Official from Gillette, Wyoming for ICC Board of Directors.
    My questions and answers are based on some bastardized hodge podge starting with the 2003 I-codes amended by the state of CT in 2005 and 2009 including the 2005 NEC ....and as of today.....The 2011 Connecticut Amendments to the 2009 International Energy Conservation Code portion of the 2005 State Building Code has been posted to the State Building Inspector’s website

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    Sawhorse Inspector Gift's Avatar
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    both Oregon and Montana have also amended the risers to allow 8" max and the tread treads to a minimum of 9".
    "Build it Well, whatever you do. Build it Strong, Straight, and True. Build it High; build it Broad. Build it for the eye of God."

    "If it's worth doing, it's worth doing right."

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    Sawhorse mtlogcabin's Avatar
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    Fo IRC buildings Montana is 8 1/4" riser. In our jurisdiction on new construction we usually see 11" treads but 9" is allowed.

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    Sawhorse GBrackins's Avatar
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    Massachusetts amended to allow 8-1/4" maximum riser, minimum 9" tread
    Gary

    "If you don't have time to do it right the first time, when will you find the time to fix it?"

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    Sawhorse Francis Vineyard's Avatar
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    Quote Originally Posted by GBrackins View Post
    Massachusetts amended to allow 8-1/4" maximum riser, minimum 9" tread

    Same as Virginia




    Francis
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    ACCESS TO VIRGINIA CODES: 2009 Commonwealth of Virginia Codes

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    Administrator fatboy's Avatar
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    No statewide adoption in CO, no local amendments. Don't know of anyone in CO that amends the section either.
    Arguing with an inspector is like wrestling with a pig in mud, pretty soon you realize that the pig is enjoying it!

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    Kentucky is 8 1/4" rise 9" tread. Same as Mass and Virginia

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    Administrator jar546's Avatar
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    Items for Sale
    Pennsylvania for Residential ONLY

    8-1/4" Rise, 9" Tread
    Admin

  10. #10
    Sawhorse TJacobs's Avatar
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    Our jurisdiction does not enact amendments that weaken the codes.
    Jake

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    Georgia allows the 1st and last riser to vary from the other risers by as much as 3/4" and allows a 9" tread depth.

    GPE

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    Sawhorse skipharper's Avatar
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    I like TJacobs thoughts but maybe it really is true what some builders tell me--you can't build a cape cod with IRC compliant stairs--LMAO

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    Sawhorse Sifu's Avatar
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    As of the time I left NC, they also have a different requirement. 8 1/4" riser, 9" tread, 3/4" total differential and 3/8" adjacent differential for risers, allowance for the bottom riser of an exterior set of steps. Not really an amendment, they have their own code but it is mostly the same as the I-codes. I have 2009 NC codes but not the 2012, not sure if they changed it but I doubt it.

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    Moderator Daddy-0-'s Avatar
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    I kind of agree with you on this one Skip. Of course it is hard to find a carpenter that can still cut a stair stringer so maybe we shouldn't confuse them more!!!
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    RI has always had and maintained in residential 8-1/4 rise 9" tread - we have smaller feet and longer legs than the IRC

  16. #16
    Sawhorse Paul Sweet's Avatar
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    Stairs will require about 2 feet more run for a 9 ft. floor-to-floor height with the current IBC requirements. It doesn't make much difference in McMansions, but it won't fit if you're trying to build a 1500 SF cape with a straight stair parallel to the roof slope

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