Idaho Admin. Code r. 24.39.30.004

Current through August 31, 2023

Section 24.39.30.004 - ADOPTION AND INCORPORATION BY REFERENCE

Under the provisions of Sections 39-4109 and 39-4109A, Idaho Code, the codes enumerated in this section are hereby adopted and incorporated by reference into these rules. (4-6-23)T

01.International Building Code. (4-6-23)T

a. 2018 Edition with the following amendments: (4-6-23)T

i. Delete Section 305.2.3 and replace with the following: 305.2.3 Twelve (12) or fewer children in a dwelling unit. A facility such as the above within a dwelling unit and having twelve (12) or fewer children receiving such day care shall be classified as a Group R-3 occupancy or shall comply with the International Residential Code. (4-6-23)T

ii. Delete Section 308.2.4 and replace with the following: 308.2.4 Five (5) or fewer persons receiving custodial care. A facility with five (5) or fewer persons receiving custodial care shall be classified as a Group R-3 occupancy or shall comply with the International Residential Code. (4-6-23)T

iii. Delete Section 308.3.2 and replace with the following: 308.3.2 Five (5) or fewer persons receiving medical care. A facility with five (5) or fewer persons receiving medical care shall be classified as a Group R-3 occupancy. (4-6-23)T

iv. Delete Section 308.5.4 and replace with the following: 308.5.4 Persons receiving care in a dwelling unit. A facility such as the above within a dwelling unit and having twelve (12) or fewer children receiving day care or having five (5) or fewer persons receiving custodial care shall be classified as a Group R-3 occupancy or shall comply with the International Residential Code. (4-6-23)T

v. Delete Section 310.4 and replace with the following: 310.4 Residential Group R-3. Residential Group R-3 occupancies where the occupants are primarily permanent in nature and not classified as Group R-1, R-2, R-4, E or I, including:

1. Buildings that do not contain more than two (2) dwelling units.

2. Care facilities that provide accommodations for five (5) or fewer persons receiving personal care, custodial care or medical care.

3. Congregate living facilities (nontransient) with sixteen (16) or fewer occupants, including boarding houses (nontransient), convents, dormitories, fraternities and sororities, and monasteries.

4. Congregate living facilities (transient) with ten (10) or fewer occupants, including boarding houses (transient).

5. Dwelling units providing day care for twelve (12) or fewer children.

6. Lodging houses (transient) with five (5) or fewer guest rooms and ten (10) or fewer occupants. (4-6-23)T

vi. Delete Section 310.4.1 and replace with the following: 310.4.1 Care facilities within a dwelling. Care facilities for twelve (12) or fewer children receiving day care or for five (5) or fewer persons receiving personal care or custodial care that are within a one- or two-family dwelling are permitted to comply with the International Residential Code. (4-6-23)T

vii. Add the following as Section 602.1.2: 602.1.2 Alternative provisions. As an alternative to the construction types defined in Sections 602.2 through 602.5, buildings and structures erected or to be erected, altered, or extended in height or area may be classified as construction type IV-A, IV-B, or IV-C in accordance with the provisions adopted in Paragraph 004.01.b of these rules. Buildings and structures classified as construction type IVA, IV-B, or IV-C shall comply with the provisions adopted in Paragraph 004.01.b of these rules and all other applicable provisions of this code. (4-6-23)T

viii. Delete footnote ^e under Table 2902.1 Minimum Number of Required Plumbing Fixtures and replace with the following: ^e For business occupancies, excluding restaurants, and mercantile occupancies with an occupant load of thirty (30) or fewer, service sinks shall not be required. (4-6-23)T

ix. Delete footnote ^f from Table 2902.1 Minimum Number of Required Plumbing Fixtures, add footnote ^f in the header row of the column in Table 2902.1 labeled "Drinking Fountains," and delete footnote ^f under Table 2902.1 and replace with the following: ^f Drinking fountains are not required for an occupant load of thirty (30) or fewer. (4-6-23)T

x. Delete Section 3113.1 and replace with the following: 3113.1 General. The provisions of this Section shall apply to relocatable buildings. Relocatable buildings manufactured after the effective date of this code shall comply with the applicable provisions of this code; title 39, chapter 43, Idaho Code; and IDAPA 24.39.31. Exception: This Section shall not apply to manufactured housing used as dwellings. (4-6-23)T

b. The provisions of the 2021 Edition relating to mass timber construction, including, but not limited to: (4-6-23)T

i. In Section 202, the definitions of the terms MASS TIMBER; NONCOMBUSTIBLE PROTECTION (FOR MASS TIMBER); SECONDARY STRUCTURAL MEMBERS; and WALL, LOAD BEARING; (4-6-23)T

ii. Sections 403.3.2, 508.4.4.1, 509.4.1.1, 602.4 through 602.4.3.6, 703.6, 703.7, 704.4, 722.7 through 722.7.2.2, 1705.5.3, 1705.20, 2304.10.1, 3313.1 through 3313.3.3, 3313.5, and 3314.1; (4-6-23)T

iii. Tables 504.3, 504.4, 506.2, 601, 705.5, 722.7.1(1), 722.7.1(2), and 1705.5.3, including any note following each table adopted in this subparagraph; and (4-6-23)T

iv. In Chapter 35, the referenced standards ANSI/APA PRG 320-2019: Standard for Performance rated Cross-laminated Timber, referenced in Sections 602.4 and 2303.1.4, and ASTM D3498-03(2011): Standard Specification for Adhesives for Field-Gluing Plywood to Lumber Framing for Floor Systems, referenced in Section 703.7. (4-6-23)T

02.International Residential Code. 2018 Edition with the following amendments: (4-6-23)T

a. Delete the exception under Section R101.2 Scope, and replace with the following: Exception: The following shall also be permitted to be constructed in accordance with this code:

1. Owner-occupied lodging houses with five (5) or fewer guestrooms and ten (10) or fewer total occupants.

2. A care facility with five (5) or fewer persons receiving custodial care within a dwelling unit or single-family dwelling.

3. A care facility for five (5) or fewer persons receiving personal care that are within a dwelling unit or single-family dwelling.

4. A care facility with twelve (12) or fewer children receiving day care within a dwelling unit or single-family dwelling. (4-6-23)T

b. Delete Section R104.10.1 Flood hazard areas. (4-6-23)T

c. Delete item number 7 under the "Building" subheading of Section R105.2 Work exempt from permit, and replace with the following: 7. Prefabricated swimming pools that are not greater than four (4) feet (one thousand, two hundred nineteen (1219) mm) deep. (4-6-23)T

d. Add the following as item number 11 under the "Building" subheading of Section R105.2 Work exempt from permit: 11. Flag poles. (4-6-23)T

e. Delete Section R109.1.3 and replace with the following: R109.1.3 Floodplain inspections. For construction in areas prone to flooding as established by Table R301.2(1), upon placement of the lowest floor, including basement, the building official is authorized to require submission of documentation of the elevation of the lowest floor, including basement, required in Section R322. (4-6-23)T

f. Delete Section R301.2.1.2 Protection of Openings. (4-6-23)T

g. Delete Table R302.1(1) and replace with the following:

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 E 119, UL263, or Section 703.3 of the International Building Code with exposure from both sides	< 3 feet
Walls	Not fire-resistance rated	0 hours	> 3 feet
Projections	Fire-resistance rated	1 hour on the underside, or heavy timber, or fire retardant-treated wood^a,b	>2 feet to < 3 feet
Projections	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
Penetrations	All	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 overhangif fireblocking is provided from the wall top plate to the underside of the roof sheathing.

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. (4-6-23)T

h. Delete Section R302.13 Fire protection of floors. (4-6-23)T

i. Delete 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. (4-6-23)T

j. Delete the exception under Section R313.1 Townhouse automatic fire sprinkler systems, and replace with the following: Exception: Automatic residential fire sprinkler systems shall not be required in townhouses where either two (2) one (1)-hour fire-resistance-rated walls or a common two (2)-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. (4-6-23)T

k. Delete Section R313.2 One- and two-family dwellings automatic fire sprinkler systems. (4-6-23)T

l. Delete the exceptions under Section R314.2.2 Alterations, repairs and additions, and replace with the following: Exceptions:

1. Work involving the exterior surfaces of dwellings, such as, but not limited to, replacement of roofing or siding, or the addition or replacement of windows or doors, or the addition of a porch or deck or electrical permits, are exempt from the requirements of this section.

2. Installation, alteration or repairs of plumbing or mechanical systems are exempt from the requirements of this section. (4-6-23)T

m. Delete the exceptions under Section R315.2.2 Alterations, repairs and additions, and replace with the following: Exceptions:

2. Installation, alteration or repairs of noncombustion plumbing or mechanical systems are exempt from the requirements of this section. (4-6-23)T

n. Delete Section R322.1.10 As-built elevation documentation. (4-6-23)T

o. Delete Section R322.2.1 and replace with the following: R322.2.1 Elevation requirements.

1. Buildings and structures in flood hazard areas, including flood hazard areas designated as Coastal A Zones, shall have the lowest floors elevated to or above the base flood elevation.

2. In areas of shallow flooding (AO Zones), buildings and structures shall have the lowest floors (including basement) elevated to a height above the highest adjacent grade of not less than the depth number specified in feet (mm) on the FIRM, or not less than two (2) feet (610 mm) if a depth number is not specified.

3. Basement floors that are below grade on all sides shall be elevated to or above base flood elevation. Exception: Enclosed areas below the design flood elevation, including basements with floors that are not below grade on all sides, shall meet the requirements of Section R322.2.2. (4-6-23)T

p. Delete subparagraph 2.1 of Section R322.2.2 Enclosed area below design flood elevation, and replace with the following: 2.1. The total net area of all openings shall be at least one (1) square inch (645 mm2) for each square foot (0.093 m2) of enclosed area, or the opening shall be designed and the construction documents shall include a statement that the design and installation of the openings will provide for equalization of hydrostatic flood forces on exterior walls by allowing the automatic entry and exit of floodwaters. (4-6-23)T

q. Delete Tables R403 Minimum Depth (D) and Width (W) of Crushed Stone Footings (inches), R403.1(1) Minimum Width and Thickness for Concrete Footings for Light-Frame Construction (inches), R403.1(2) Minimum Width and Thickness for Concrete Footings for Light-Frame Construction and Brick Veneer (inches), and R403.1(3) Minimum Width and Thickness for Concrete Footings with Cast-In-Place or Fully Grouted Masonry Wall Construction (inches). (4-6-23)T

r. Add the following as Table R403.1:

TABLE R403.1

MINIMUM WIDTH OF CONCRETE, PRECAST, OR MASONRY FOOTINGS (inches)^a

	LOAD-BEARING VALUE OF SOIL (psf)
	1,500	2,000	3,000	> 4,000
Conventional light-frame construction
1-Story	12	12	12	12
2-Story	15	12	12	12
3-Story	23	17	12	12
4-inch brick veneer over light frame or 8-inch hollow concrete masonry
1-Story	12	12	12	12
2-Story	21	16	12	12
3-Story	32	24	16	12
8-inch solid or fully grouted masonry
1-Story	16	12	12	12
2-Story	29	21	14	12
3-Story	42	32	21	16

For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.

^aWhere minimum footing width is twelve (12) inches, use of a single wythe of solid or fully grouted twelve (12)-inch nominal concrete masonry units is permitted. (4-6-23)T

s. Delete Section R403.1.1 and replace with the following: R403.1.1 Minimum size. Minimum sizes for concrete and masonry footings shall be as set forth in Table R403.1 and Figure R403.1(1). The footing width (W) shall be based on the load bearing value of the soil in accordance with Table R401.4.1. Spread footings shall be at least six (6) inches in thickness (T). Footing projections (P) shall be at least two (2) inches and shall not exceed the thickness of the footing. The size of footings supporting piers and columns shall be based on the tributary load and allowable soil pressure in accordance with Table R401.4.1. Footings for wood foundations shall be in accordance with the details set forth in Section R403.2 and Figures R403.1(2) and R403.1(3). (4-6-23)T

t. Delete Section R602.10 and replace with the following: R602.10 Wall bracing. Buildings shall be braced in accordance with this Section or, when applicable Section R602.12, or the most current edition of APA System Report SR-102 as an alternate method. Where a building, or portion thereof, does not comply with one (1) or more of the bracing requirements in this Section, those portions shall be designed and constructed in accordance with Section R301.1. (4-6-23)T

03.International Existing Building Code. 2018 Edition. (4-6-23)T

04.International Energy Conservation Code. 2018 Edition with the following amendments: (4-6-23)T

a. Add the following as Section C101.5.2: C101.5.2 Industrial, electronic, and manufacturing equipment. Buildings or portions thereof that are heated or cooled exclusively to maintain the required operating temperature of industrial, electronic, or manufacturing equipment shall be exempt from the provisions of this code. Such buildings or portions thereof shall be separated from connected conditioned space by building thermal envelope assemblies complying with this code. (4-6-23)T

b. Add the following as an exception under Section C402.5 Air leakage-thermal envelope (Mandatory): Exception: For buildings having over fifty thousand (50,000) square feet of conditioned floor area, air leakage testing shall be permitted to be conducted on less than the whole building, provided the following portions of the building are tested and their measured air leakage is area-weighted by the surface areas of the building envelope:

1. The entire floor area of all stories that have any spaces directly under a roof.

2.The entire floor area of all stories that have a building entrance or loading dock.

3. Representative above-grade wall sections of the building totaling at least twenty-five percent (25%) of the above-grade wall area enclosing the remaining conditioned space. Floor area tested under subparagraphs 1. or 2. of this exception shall not be included in the twenty-five percent (25%) of abovegrade wall sections tested under this subparagraph. (4-6-23)T

c. Add the following as exception number 7 under Section C403.5 Economizers (Prescriptive): 7. Unusual outdoor air contaminate conditions - Systems where special outside air filtration and treatment for the reduction and treatment of unusual outdoor contaminants, makes an air economizer infeasible. (4-6-23)T

d. Delete Table C404.5.1 and replace with the following:

TABLE C404.5.1 PIPING VOLUME AND MAXIMUM PIPING LENGTHS
NOMINAL PIPE SIZE (inches)	VOLUME (liquid ounces per foot length)	MAXIMUM PIPING LENGTH (feet)
NOMINAL PIPE SIZE (inches)	VOLUME (liquid ounces per foot length)	Public lavatory faucets	Other fixtures and appliances
1/4	0.33	31	50
5/16	0.5	N/A - non-standard size	50
3/8	0.75	17	50
1/2	1.5	10	43
5/8	2	7	32
3/4	3	5	21
7/8	4	N/A - non-standard size	16
1	5	3	13
1 1/4	8	2	8
1 1/2	11	1	6
2 or larger	18	1	4

For SI: 1 inch = 25.4 mm; 1 foot = 304.8 mm; 1 liquid ounce = 0.030 L; 1 gallon = 128 ounces. (4-6-23)T

e. Delete the rows in Table R402.1.2 for climate zones "5 and Marine 4" and "6" and replace with the following:

TABLE R402.1.2 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT^a
Climate Zone	Fenestration U- Factorb	Skylightb U-factor	Glazed Fenestration SHGCb, ^e	Ceiling R-Value	Wood Frame Wall R-Value	Mass Wall R-Value'	Floor R-Value	Basementc Wall R-Value	Slab^dR-Value & Depth	Crawlspacec Wall R-Value
5	0.32	0.55	NR	38	20 or 13+5^h	13/17	30^g	15/19	10, 2 ft	15/19
6	0.30	0.55	NR	49	22 or 13+5^h	15/20	30^g	15/19	10, 4 ft	15/19

(4-6-23)T

f. Add the following as footnote ^k to the title of Table R402.1.2 - Insulation and Fenestration Requirements by Component: ^k' For residential log home building thermal envelope construction requirements see Section R402.6. (4-6-23)T

g. Delete the rows in Table R402.1.4 for climate zones "5 and Marine 4" and "6" and replace with the following:

TABLE R402.1.4 EQUIVALENT U-FACTORS^a
Climate Zone	Fenestration U-factor	Skylight U-factor	Ceiling U-factor	Frame Wall U-factor	Mass Wall U-factor^b	Floor U-factor	Basement Wall U-factor	Crawlspace Wall U-factor
5	0.32	0.55	0.030	0.060	0.082	0.033	0.050	0.055
6	0.30	0.55	0.026	0.057	0.060	0.033	0.050	0.055

(4-6-23)T

h. Delete Section R402.4.1 and replace with the following: R402.4.1 Building thermal envelope.

1. Until June 30, 2021, the building thermal envelope shall comply with Sections R402.4.1.1 (Installation) and either Section R402.4.1.2 (Testing) or Section R402.4.1.3 (Visual inspection).

2. Effective July 1, 2021, the building thermal envelope of a minimum of twenty percent (20%) of all new single-family homes constructed by each builder shall comply with Section R402.4.1.1 (Installation) and Section R402.4.1.2 (Testing). The authority having jurisdiction may: 2.1. Determine how to enforce this requirement, starting with the fifth house and continuing with each subsequent fifth house. 2.2. Waive this requirement if significant testing indicates the five (5) air changes per hour (ACH) requirement is consistently being met or exceeded (resulting in a lower ACH). 2.3. Grant exceptions to this requirement in rural areas where testing equipment is not available or cost effective.

3. Effective July 1, 2021, the building thermal envelope of eighty percent (80%) of all new single-family homes constructed by each builder shall comply with Section R402.4.1.1 (Installation) and either Section R402.4.1.2 (Testing) or Section R402.4.1.3 (Visual inspection).

4. The sealing methods between dissimilar materials shall allow for differential expansion and contraction. (4-6-23)T

i. Delete Section R402.4.1.1 and replace with the following: R402.4.1.1 Installation. The components of the building thermal envelope as listed in Table R402.4.1.1 shall be installed in accordance with the manufacturer's instructions and the criteria listed in Table R402.4.1.1, as applicable to the method of construction. (4-6-23)T

j. Delete Section R402.4.1.2 and replace with the following: R402.4.1.2 Testing. Testing building envelope tightness and insulation installation shall be considered acceptable when tested air leakage is less than five (5) air changes per hour (ACH) when tested with a blower door at a pressure of 33.5 psf (50 Pa). Testing shall occur after rough in and after installation of penetrations of the building envelope, including penetrations for utilities, plumbing, electrical, ventilation and combustion appliances. Testing shall be conducted in accordance with RESNET/ ICC 380, ASTM E 779 or ASTM E 1827 and reported at a pressure of 0.2-inch w.g. (50 Pascals). During testing:

1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed.

2. Dampers shall be closed, but not sealed, including exhaust, intake, makeup air, backdraft and flue dampers.

3. Interior doors shall be open.

4. Exterior openings for continuous ventilation systems and heat recovery ventilators shall be closed and sealed.

5. Heating and cooling system(s) shall be turned off.

6. HVAC ducts shall not be sealed.

7.Supply and return registers shall not be sealed. (4-6-23)T

k. Add the following as Section R402.4.1.3: R402.4.1.3 Visual inspection. Building envelope tightness and insulation installation shall be considered acceptable when the items listed in Table R402.4.1.1, applicable to the method of construction, are field verified. Where required by code official an approved party independent from the installer of the insulation shall inspect the air barrier and insulation. (4-6-23)T

l. Add the following as Section R402.6: R402.6 Residential log home thermal envelope. Residential log home construction shall comply with Section R401 (General), Section R402.4 (Air leakage), Section R402.5 (Maximum fenestration U-factor and SHGC), Section R403.1 (Controls), the mandatory sections of Sections R403.3 through R403.9, Section R404 (Electrical Power and Lighting Systems), and either 1., 2., or 3. as follows:

1. Sections R402.2 through R402.3, Section R403.3.1 (Insulation), Section R404.1 (Lightning equipment), and Table R402.6 (Log Home Prescriptive Thermal Envelope Requirements by Component).

2. Section R405 (Simulated Performance Alternative).

3. RES check (U.S. Department of Energy Building Codes Program). (4-6-23)T

m. Add the following as Table R402.6:

TABLE R402.6 LOG HOME PRESCRIPTIVE THERMAL ENVELOPE REQUIREMENTS BY COMPONENT For SI: 1 foot = 304.8 mm.
Climate Zone	Fenestration U-factora	Skylight U-factor	Glazed Fenestration SHGC	Ceiling R-value	Min. Average Log Size In Inches	Floor R-value	Basement Wall R-value^d	Slab R-value & Depthb	Crawl Space Wall R-value^d
5, 6 - High efficiency equipment path^c	0.32	0.60	NR	49	5	30	15/19	10, 4 ft.	10/13
5	0.32	0.60	NR	49	8	30	10/13	10, 2 ft.	10/13
6	0.30	0.60	NR	49	8	30	15/19	10, 4 ft.	10/13
^aThe fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. ^bR-5 shall be added to the required slab edge R-values for heated slabs. ^c90% AFUE natural gas or propane, 84% AFUE oil, or 15 SEER heat pump heating equipment (zonal electric resistance heating equipment such as electric base board electric resistance heating equipment as the sole source for heating is considered compliant with the high efficiency equipment path). ^d"15/19" means R-15 continuous insulated sheathing on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. "15/19" shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulated sheathing on the interior or exterior of the home. "10/13" means R-10 continuous insulated sheathing on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.

(4-6-23)T

n. Delete Section R403.3.1 and replace with the following: R403.3.1 Duct insulation requirements. Supply and return ducts located in an attic space shall have an R-value of not less than R-8. (4-6-23)T

o. Delete Sections R403.3.6 and R403.3.7. (4-6-23)T

p. Delete Section R403.5.3 and replace with the following: R403.5.3 Hot water pipe insulation (Prescriptive). Insulation for hot water piping with a thermal resistance, R-value, of not less than R-3 shall be applied to the following:

1. Piping serving more than one (1) dwelling unit.

2. Piping located outside the conditioned space.

3. Piping located under a floor slab.

4. Buried piping.

5. Supply and return piping in recirculation systems other than demand recirculation systems. (4-6-23)T

q. Delete Section R404.1 and replace with the following: R404.1 Lighting equipment (Mandatory). A minimum of seventy-five percent (75%) of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps or a minimum of seventy-five percent (75%) of the permanently installed lighting fixtures shall contain only high efficacy lamps. (4-6-23)T

r. Delete Section R406.3 and replace with the following: R406.3 Energy Rating Index. The Energy Rating Index (ERI) shall be determined in accordance with RESNET/ICC 301. Energy used to recharge or refuel a vehicle used for transportation on roads that are not on the building site shall not be included in the ERI reference design or the rated design. (4-6-23)T

s. Delete Table R406.4 and replace with the following:

Table R406.4 - Maximum Energy Rating Index

Climate Zone	Energy Rating Index^a
5	68
6	68

^a Where on-site renewable energy is included for compliance using the ERI analysis of Section R406.4, the building shall meet the mandatory requirements of Section R406.2, and the building thermal envelope shall be greater than or equal to the levels of efficiency and SHGC in Table R402.1.2 or Table R402.1.4 of the 2015 International Energy Conservation Code. (4-6-23)T

05.References to Other Codes. Where any provisions of the codes that are adopted in this Section make reference to other construction and safety-related model codes or standards which have not been adopted by the involved authority having jurisdiction, to the extent possible, such reference should be construed as pertaining to the equivalent code or standard that has been duly adopted by such jurisdiction. (4-6-23)T

Idaho Admin. Code r. 24.39.30.004