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Min. stair landing to riser or nosing?

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  • Min. stair landing to riser or nosing?

    36x36 landing at the base of a run of stairs.

    Is the minimum landing dimension measured to the face of the closed riser, or to the tip of the nosing of the first tread above the landing?

    thanks,
    kevin

    (edit: sketch in next post)
    Last edited by kfc510; 06-05-2014, 12:23 AM.
    “It is difficult to get a man to understand something, when his salary depends on his not understanding it.” - Upton Sinclair

  • #2
    Re: Min. stair landing to riser or nosing?

    i.e., in this sketch we have (from left to right)

    a)face of wall
    b)face of baseboard
    c)tip of nosing
    d)face of riser board

    Where is the minimum landing dimension measured?
    Attached Files
    “It is difficult to get a man to understand something, when his salary depends on his not understanding it.” - Upton Sinclair

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    • #3
      Re: Min. stair landing to riser or nosing?

      I'm pretty sure it is measured from the nosing.
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      • #4
        Re: Min. stair landing to riser or nosing?

        Kevin:

        It's always been to the face of the riser, in the case of open risers it's the actual walking surface where one could place his foot. We used to cheat a lot on that letting the tread hang over and some inspectors started giving us a hard time, so some inspectors may differ on the interpretation especially if you really cheat, but let's face it, the more you let the tread overhang the riser above the more you extend the tread below.

        Up until 2006 the Stairway Manufacturers Association published an excellent visual interpretation, as of the 2009 code they charge.

        Look at Photo 13 in the 2006 visual interpretation linked above, treads are supposed to extend a minimum of 3/4" to a maximum of 1-1/4".

        After posting I see you posted a diagram and I see what you are up against, I'd say that's going to be an individual inspector's call.
        Last edited by Dick Seibert; 06-04-2014, 10:52 AM. Reason: Post 2
        “President Obama doing well. His approval rating is at 51%.--- The other 49% are taxpayers.” Jay Leno

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        • #5
          Re: Min. stair landing to riser or nosing?

          Great visual guide, Dick.
          “It is difficult to get a man to understand something, when his salary depends on his not understanding it.” - Upton Sinclair

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          • #6
            Re: Min. stair landing to riser or nosing?

            a to d - based on some specifics about allowed intrusions into required stair clearances that (used to?) show up in the commercial building code and/or NFPA 101 (if that is still in existence).
            But I'd ask the code folks first before I built myself into a corner

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            • #7
              Re: Min. stair landing to riser or nosing?

              Originally posted by NW Architect View Post
              But I'd ask the code folks first before I built myself into a corner
              Ask the code folks? That's no fun, I want to stir the pot here.
              “It is difficult to get a man to understand something, when his salary depends on his not understanding it.” - Upton Sinclair

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              • #8
                Re: Min. stair landing to riser or nosing?

                I'd say nosing.
                The argument would be that the direction of travel down the stairs would negate use of the space under the nosing.

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                • #9
                  Re: Min. stair landing to riser or nosing?

                  Originally posted by miterme View Post
                  I'd say nosing.
                  The argument would be that the direction of travel down the stairs would negate use of the space under the nosing.
                  I disagree, tread size is the depth that you can place your foot, I'd argue that landing size should be the same.
                  “President Obama doing well. His approval rating is at 51%.--- The other 49% are taxpayers.” Jay Leno

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                  • #10
                    Re: Min. stair landing to riser or nosing?

                    It's a-d as NW Architect has suggested.

                    Step nosings are not taken into consideration just as they are not part of the unit/run of the stair, which by definition, is "riser to riser". The 36" minimum tread width is "wall-to-wall" which is on the approved floor plans. Skirt/baseboard and various wood moldings etc. are details which are ordinarily not subject to building department review.

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