Current through Register Vol. 35, No. 18, September 24, 2024
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
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|
From the residence and attics
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Not less than five-eighth-inch Type X gypsum board
or equivalent applied to the garage side
|
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From all habitable rooms above the garage
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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
|
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Structure(s) supporting floor/ceiling assemblies
used for separation required by this section
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Not less than five-eighth-inch gypsum board or
equivalent
|
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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.
