9-1B-34: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R301.2.1.2, PROTECTION OF OPENINGS, IS DELETED:

Section R301.2.1.2, Protection of Openings, is deleted.

(Ord. 40-20, 12-1-2020, eff. 1-1-2021)

9-1B-35: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R302.1(1), EXTERIOR WALLS:

Table R302.1(1) shall be amended as follows:

   TABLE R302.1(1)

   EXTERIOR WALLS

Exterior Wall Element		Minimum Fire- Resistance Rating	Minimum Fire Separation Distance
Walls	Fire- resistance rated	1 hour-tested in accordance with ASTM E119, UL 263, or Section 703.3 of the International Building Code with exposure from both sides	<3 feet
	Not fire- resistance rated	0 hours	3 feet
Projections	Fire- resistance rated	1 hour on the underside, or heavy timber, or fire retardant-treated wooda,b	2 feet to <3 feet
	Not fire- resistance rated	0 hours	3 feet
Openings in walls	Not allowed	N/A	<3 feet
	25% maximum of wall area	0 hours	3 feet to <5 feet
	Unlimited	0 hours	5 feet
Penetrations	All	Comply with Section R302.4	<3 feet
		None required	3 feet

 

   For SI: 1 foot = 304.8 mm.

   N/A = Not Applicable.

   a.   The fire-resistance rating shall be permitted to be reduced to zero (0) hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing.

   b.   The fire-resistance rating shall be permitted to be reduced to zero (0) hours on the underside of the rake overhang where gable vent openings are not installed.

(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)

9-1B-36: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R302.6, DWELLING-GARAGE SEPARATION:

Delete Table R302.6 Dwelling-Garage Separation and replace with the following Table:

   TABLE R302.6 DWELLING-GARAGE SEPARATION

 

Separation	Material
From the residence, attics, and habitable rooms above the garage	Not less than 5/8-inch Type X gypsum board or equivalent applied to the garage side
Structure(s) supporting floor/ceiling assemblies used for separation required by this section	Not less than 5/8-inch Type X gypsum board or equivalent applied to the garage side
Garages located less than 3 feet from a dwelling unit on the same lot	Not less than 5/8-inch Type X gypsum board or equivalent applied to the interior side of the exterior walls that are within this area

 

(Ord. 3-25, 2-4-2025)

9-1B-37: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R303.4, MECHANICAL VENTILATION:

Repeal section R303.4 and replace with the following:

   R303.4 Mechanical ventilation. Dwelling units shall be provided with whole-house mechanical ventilation in accordance with Section M1505.4.

(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)

9-1B-38: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R309.3, FLOOD HAZARD AREAS:

   R309.3 Flood Hazard Areas. All construction within flood hazard areas shall be designed and constructed in accordance with the Flood Hazard regulations of the Boise Development Code in addition to this code. For buildings located in flood hazard areas as established by Table R301.2(1), garage floors shall be:

      1.   Elevated to or above the design flood elevation as determined in accordance with Section R322; or

      2.   Located below the design flood elevation provided that the floors are at or above grade on not less than one side, are used solely for parking, building access, or storage, meet the requirements of Section R322 and are otherwise constructed in accordance with this code.

(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)

9-1B-39: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R313.1, TOWNHOUSE AUTOMATIC FIRE SPRINKLER SYSTEMS EXCEPTION:

   The exception to section R313.1 shall be modified as follows:

      Exception. Automatic residential fire sprinkler systems shall not be required in townhouses where either two (2) 1-hour fire-resistance rated walls or a common two-hour fire-resistance rated wall, as specified in item number 2 of section R302.2.2, is installed between dwelling units or when additions or alterations are made to existing townhouses that do not have an automatic residential fire sprinkler system installed.

(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)

9-1B-40: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R313.2, ONE- AND TWO-FAMILY DWELLINGS AUTOMATIC FIRE SPRINKLER SYSTEMS, IS DELETED:

R313.2 One- And Two-Family Dwellings Automatic Fire Sprinkler Systems, is deleted.

(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)