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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...
    Boy it's hot!.....And where are we going in this handbasket?

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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."

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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

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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
    ACCESS TO VIRGINIA CODES: 2009& 2012 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.
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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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    8-1/4" Rise, 9" Tread
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    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

  12. #12
    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

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    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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