Current through Register Vol. 35, No. 7, April 9, 2024
Section 14.7.3.11 - CHAPTER 3 BUILDING PLANNING See this chapter of the IRC except as provided below.
A.Section R301 Design criteria. See this section of the IRC except as provided below: (1)Section R301.2 Climatic and geographic design criteria. Amend footnote "f" as follows: The authority having jurisdiction shall fill in this part of the table with the seismic design category determined from Section R301.2.2.1 or information from the U.S.G.S. software "Design Values for Buildings" found online.(2)Section 301.2.2 Seismic provisions. Add the following sentence to the end: Exception: Buildings in which earthen building materials form the bearing wall system located in seismic design categories A, B, C, Do and D1 are exempt from the seismic requirements of this code.(3)Section R301.2.2.1 Determination of seismic design category. Add the following text at the end of the section: or information from the U.S.G.S. software "Design Values for Buildings" found online.B.Section R302 Fire-Resistant Construction. See this section of the IRC except as provided below. (1)Section R302.1 Exterior. See this section of the IRC except as follows: Add the following exception: Exception 6. Exterior walls will read as follows: Where zoning or perpetual, platted, and recorded easements create a non-buildable minimum fire separation distance of at least 10 feet between structures on adjacent properties. The "one hour" "fire resistive" rating shall not apply on the underside of the projections that project a maximum of 24 inches.(2)Table R302.1(1) Exterior walls. Delete this table in the IRC without substitution.(3)Table R302.1(2) Exterior walls - Dwellings with Fire Sprinklers. Delete the title of this table in the IRC and substitute with following: Table R302.1 (1) Exterior walls.(4) Add a new subsection as follows: Section R302.1.1 Zero lot line separation. Where perpetual, platted, and recorded easements create a non-buildable minimum fire separation distance of at least six feet between structures on adjacent properties, the one-hour fire-resistive rating shall not apply.(5)Section R302.2 Townhouses. Add the following sentence to the beginning of the exception: The following exception applies if the townhouse has an automatic residential fire sprinkler system.(6)Section R302.2.2 Common Walls. Delete the text "Chapters 34 through 43" from the second to the last sentence and replace with current adopted electrical code.(7)Section R302.6 Dwelling-garage fire separation required. Delete the text of this section and substitute with the following: The garage shall be separated as required by Table 302.6. Attachment of gypsum board shall comply with Table R702.3.5. Openings in these walls shall be regulated by section R302.5. The wall separation provisions of Table R302.6 shall not apply to garage walls that are perpendicular to the adjacent dwelling unit wall.(8)Table R302.6 Dwelling-garage separation. Delete the text of table R302.6 and replace with the following: Table R302.6 DWELLING-GARAGE SEPARATION |
SEPARATION | MATERIAL |
From the residence and attics | Not less than five-eighth-inch Type X gypsum board or equivalent applied to the garage side |
From all habitable rooms above the garage | Not less than five-eighth-inch Type X gypsum board or equivalent applied to the interior side of exterior walls that are within this area |
Structure(s) supporting floor/ceiling assemblies used for separation required by this section | Not less than five-eighth-inch gypsum board or equivalent |
Garages located less than three feet from a dwelling unit on the same lot | Not less than five-eighth-inch gypsum board or equivalent |
(9)Section R302.13 Fire protection of floors. Delete the text of this section without substitution.C.Section R303 Light, Ventilation, and Heating. See this section of the IRC except as provided below. Section R303.4 Mechanical ventilation. Delete this section and substitute with the following: The dwelling unit ventilation shall be in accordance with 14.9.2 NMAC.D.Section R309 Garages and Carports. See this section of the IRC except as provided below. Section R309.1 Garages and carports. Delete the text of this section of the IRC and substitute with the following: Garage floor surfaces shall be of approved noncombustible material. The area of floor used for parking of automobiles or other vehicles shall be sloped to a minimum of one percent to facilitate the movement of liquids to a drain or toward the main vehicle entry doorway. The approach apron shall be recessed a minimum of three-fourths inch at the vehicle doorways to prevent entry of storm water into the garage.E.Section R311 Means of Egress. See this section of the IRC except as provided below. (1)Section R311.7 Stairways. See this section of the IRC except as provided below.(2)Section R311.7.5 Stair treads and risers. Stair treads and risers shall meet the requirements of this section. For the purposes of this section, dimensions and dimensioned surfaces shall be exclusive of carpets, rugs, or runners. (a)Section R311.7.5.1 Risers. Delete this section and substitute with the following: The riser height shall be not more than eight inches (203mm). The riser shall be measured vertically between the leading edges of the adjacent treads. The greatest riser height within any flight of stairs shall not exceed the smallest by more than three-eighth inches (9.5 mm). Risers shall be vertical or sloped from the underside of the nosing of the tread above at an angle not more than 30 degrees (0.51 rad) from the vertical. Open risers are permitted provided that the openings located more than 30 inches (762 mm), as measured vertically, to the floor or grade below do not permit the passage of a four-inch-diameter (102 mm) sphere. Exceptions: (1) The opening between adjacent treads is not limited on spiral stairways.(2) The riser height of spiral stairways shall be in accordance with Section R311.7.10.1.(b)Section R311.7.5.2 Treads. Delete this section of the IRC and substitute with the following: The tread depth shall be not less than nine inches (229mm). 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 three-eighths inch (9.5 mm).F.Section R312 Guards and Window Fall Protection. See this section of the IRC except as provided below. Section R312.1.1 Where required. Delete this section of the IRC and substitute with the following: Guards shall be provided for those portions of open-sided walking surfaces, including floors, stairs, ramps, and landings that are located more than 30 inches (762 mm) measured vertically to the floor or grade below. Insect screening shall not be considered as a guard.G.Section R313 Automatic Fire Sprinkler Systems. See this section of the IRC except as provided below. (1)Section R313.1 Townhouse automatic fire sprinkler systems. Delete this section and the exception and substitute with the following: Automatic-fire sprinklers systems in townhouses and one- and two-family dwellings are not required when the units are not more than three stories above grade plane in height and that have separate means of egress and their accessory structures.(2)Section 313.2 One- and two- family dwellings automatic fire system systems. Delete this section of the IRC without substitution.H.Section R320 Accessibility. Delete the text of this section and see Section 310.5 of the IBC.I.Section R326 Swimming Pools. Delete the text of this section and see 14.7.3.24 NMAC.14.7.3.11 NMAC - Rp, 14.7.3.11 NMAC, 1-28-11; A, 5-1-14; A, 7-1-14, Adopted by New Mexico Register, Volume XXVII, Issue 21, November 15, 2016, eff. 11/15/2016, Adopted by New Mexico Register, Volume XXXIV, Issue 11, June 13, 2023, eff. 7/14/2023