MikeCSD

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    Stairs - Risers and Treads

    in Building Codes and Compliance

    Posted

    Here are the amended codes for IRC rise and run here in Connecticut.

     

    R311.7.5.1 Risers. The maximum riser height shall be 8 ¼ inches. The riser shall be measured vertically between leading edges of adjacent treads. The greatest riser height within any flight of stairs shall not exceed the smallest by more than ⅜ inch. Risers shall be vertical or sloped from the underside of the nosing of the tread above at an angle not more than 30 degrees from the vertical. Open risers are permitted provided that the opening between treads does not permit the passage of a 4-inch-diameter sphere.

     

    Exceptions: 1. The maximum riser height of existing stairs serving existing unfinished attics or existing unfinished basements being converted to habitable space or replacement stairs where the pitch or slope cannot be reduced because of existing construction shall be 9 inches, measured in accordance with Section R311.7.5.1. 2. The opening between adjacent treads is not limited on stairs with a total rise of 30 inches or less.

     

    R311.7.5.2 Treads. The minimum tread depth shall be 9 inches. The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread’s leading edge. The greatest tread depth within any flight of stairs shall not exceed the smallest by more than ⅜ inch.

     

    Exception: The minimum tread depth of existing stairs serving existing unfinished attics or existing unfinished basements being converted to habitable space or replacement stairs within existing dwellings shall be 8 inches, measured in accordance with Section R311.7.5.2.

     

     

     

    NY code and garage floor elevation

    in Building Codes and Compliance

    Posted

    IRC requirements can be overruled by manufacturer's installation instructions, you are 100% correct.

     

    R102.4 Referenced codes and standards. The codes and standards referenced in this code shall be considered part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections R102.4.1 and R102.4.2.

    Exception: Where enforcement of a code provision would violate the conditions of the listing of the equipment or appliance, the conditions of the listing and manufacturer’s instructions shall apply.

     

    R102.4.1 Conflicts. Where conflicts occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.

     

    R102.4.2 Provisions in referenced codes and standards. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced code or standard.

     

    NY code and garage floor elevation

    in Building Codes and Compliance

    Posted

    On 4/18/2020 at 2:07 PM, BILL88 said:

    Heres your answer. See snip attached. Also link to NY State residrntial bldng code pdf > https://www.dos.ny.gov/DCEA/pdf/pdf/2020 Residential Code of New York State.pdfNy   Code is mostly plagurization of IBC which states that all grades must be a minimum 2% slope away from structures. So 2% slope at your garage entry.

    ny bldng code garages.PNG

    Bill, I respectfully disagree with you, you cannot apply IBC codes to a structure that is governed by the IRC. R101.2 specifically states that 1 and 2 family dwellings shall be constructed under the IRC. R309.1 doesn't provide a minimum slope. R401.3 provides a minimum slope of grade away from the structure (6" within the first 10'), but that doesn't apply to garage floors. There is also no code section in the IRC that states there must be a 4" elevation drop in a garage, it does not exist. You also cannot apply a code that was in effect years ago, you can only apply the code that is in effect at the time the permit is issued. You have to be very careful when interpreting codes, you can't take requirements from one section and apply it to another without a code path. You should also make sure that there aren't any state amendments of a particular code section, which could greatly alter requirements.