10-9-2. - Adoption of the International Mechanical Code With Modifications.
(a) The 2024 edition of the International Mechanical Code, including Appendix A thereto, of the International Code Council, is hereby adopted by reference as the Mechanical Code of the City of Boulder or mechanical code and has the same force and effect as though fully set forth in this chapter, except as specifically amended by the provisions of this chapter.
(b) Except as specified below, Chapter 1 is repealed. This code shall be administered in accordance with Chapter 1, "Administration," of the International Building Code as adopted, with amendments, by Section 10-5-2, "Adoption Of International Building Code With Modifications," B.R.C. 1981.
(1) Section 101.2, "Scope," is adopted as an administrative provision.
(2) Section 101.2.1, "Appendices," is adopted as an administrative provision. Appendix A is adopted as a part of this code.
(3) Section 101.3, "Purpose," is adopted as an administrative provision.
(c) Section 301.10, "Electrical," is repealed and reenacted to read:
301.10 Electrical. Electrical wiring, controls, and connections to equipment and appliances regulated by this code shall be in accordance with Chapter 10-6, "Electrical Code," B.R.C. 1981.
(d) A new Section 306.6, "Rooftop equipment support and clearances," is added:
306.6 Rooftop equipment support and clearances.
(1) Mechanical equipment placed, replaced, or resting over roofing shall be supported by curbs or legs which shall be flashed to the roofing and made watertight. Mechanical equipment shall include, but not be limited to, heating equipment, cooling and refrigeration equipment, ventilating fans, blowers, and other similar devices located on the roof.
(2) Flat roofs. On roofs having a pitch of less than 2 in 12, mechanical equipment shall be supported on a solid curb greater in size than the equipment which it serves. Curbs can be manufactured or built-in-place. If built-in-place, the curb shall be covered with metal of at least 26 gauge. All seams and miter corners of the metal shall be riveted and soldered so as to be weather-tight. The curb shall be a minimum of 9 inches above the finished roof.
(A) Ducts less than four feet in width shall have at least twelve inches clearance from the finished roof surface to the bottom of the duct.
(B) Ducts between four feet and eight feet in width shall have at least twenty-four inches clearance from the finished roof surface to the bottom of the duct.
(C) Ducts over eight feet in width shall have at least thirty-six inches clearance from the finished roof surface to the bottom of the duct.
(3) Pitched Roofs. On roofs having a slope over a 2 and 12, mechanical equipment may be set on legs which provide a minimum of 11 inches clearance between the finished roof surface and the equipment frame.
Smoke detectors must be capable of being tested from a remote and readily accessible location.
Ordinance Nos. 4984 (1986); 5177 (1989); 5493 (1992); 5781 (1996); 7566 (2007); 7925 (2013); 8366 (2020); 8684 (2025)
