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HomeMy WebLinkAboutState of Idaho Adopted Building Code AmendmentsIdaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Page 1 of 8 Idaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Section39-4116 (3), Idaho Code - All single family homes and multiple family dwellings up to two (2) units are hereby exempted from the provisions of the International Fire Code, the International Building Code and the Idaho residential code that require such dwellings to have automatic fire sprinkler systems installed. Nothing in this section shall prevent any person from voluntarily installing an automatic fire sprinkler system in any residential dwelling. IDAHO ADMINISTRATIVE CODE IDAPA 07.03.01 Division of Building Safety Rules of Building Safety 01. International Building Code. 2015 Edition with the following amendments: a. Delete section 305.2.3 and replace with the following: 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. b. Delete section 308.6.4 and replace with the following: 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. c. Delete section 310.5 and replace with the following: 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: i. Buildings that do not contain more than two (2) dwelling units; ii. Boarding houses (nontransient) with sixteen (16) or fewer occupants; iii. Boarding houses (transient) with ten (10) or fewer occupants; iv. Care facilities that provide accommodations for five (5) or fewer persons receiving care; v. Congregate living facilities (nontransient) with sixteen (16) or fewer occupants; vi. Congregate living facilities (transient) with ten (10) or fewer occupants; or vii. Dwelling units providing day care for twelve (12) or fewer children. viii. Lodging houses with five (5) or fewer guest rooms. d. Delete section 310.5.1 and replace with the following: Care facilities within a dwelling. Care facilities for twelve (12) or fewer children receiving day care or for five (5) or fewer persons receiving care that are within a single-family dwelling are permitted to comply with the International Residential Code. Idaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Page 2 of 8 e. Add footnote (f) in the header row of the table column labeled “Drinking Fountains” of Table 2902.1 Minimum Number of Required Plumbing Fixtures, and add footnote (f) under Table 2902.1 to state the following: Drinking fountains are not required for an occupant load of thirty (30) or fewer. f. Delete footnote (e) contained under Table 2902.1 Minimum Number of Required Plumbing Fixtures and replace with the following: For business occupancies, excluding restaurants, and mercantile occupancies with an occupant load of thirty (30) or fewer, service sinks shall not be required. 02. International Residential Code. 2012 Edition with the following amendments: a. Delete exception No. 1 contained under IRC section R101.2 - Scope. b. Delete exception No. 2 contained under IRC section R101.2 - Scope, and replace with the following: Owner-occupied lodging houses with five (5) or fewer guestrooms shall be permitted to be constructed in accordance with the International Residential Code for One- and Two-family Dwellings. c. Delete item No. 7 contained under the “Building” subsection of IRC section R105.2 - Work exempt from permit, and replace with the following: Prefabricated swimming pools that are not greater than four (4) feet (one thousand, two hundred nineteen (1219) mm) deep. (4-7-11) d. Add the following item No. 11 at the end of the “Building” subsection of IRC section R105.2 - Work exempt from permit: Flag poles. e. Delete IRC section R109.1.3 and replace with the following: 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. f. IRC Table R302.1(1) Exterior Walls -- 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 or UL263 with exposure from both sides < 3 feet Not fire-resistance rated 0 hours ≥ 3 feet Projections Fire-resistance rated 1 hour on the underside ≥ 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 Idaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Page 3 of 8 Penetrations All Comply with Section R302.4 < 3 feet None required ≥ 3 feet For SI: 1 foot = 304.8 mm. N/A = Not Applicable g. Delete the exception contained under IRC section R302.2 -- Townhouses, and replace with the following two (2) exceptions: i. When provided with an automatic fire sprinkler system per section R313.1, a common one (1)-hour fire-resistance-rated wall assembly tested in accordance with ASTM E 119 or UL 263 is permitted for townhouses if such walls do not contain plumbing or mechanical equipment, ducts, or vents in the cavity of the common wall. The wall shall be rated for fire exposure from both sides, and shall extend to and be tight against exterior walls and the underside of the roof sheathing. Penetrations of electrical outlet boxes shall be in accordance with Section R302.4. ii. Two (2) one (1)-hour fire-resistance-rated wall assemblies (as specified in Section R302.1) or a common two (2)-hour fire-resistance-rated wall assembly tested in accordance with ASTM E 119 or UL 263 are permitted for townhouses. If two (2) one (1)-hour fire-resistance-rated walls are used, plumbing and electrical installations within the wall cavity shall conform to fire-resistance penetration requirements in accordance with section R302.4 through R302.4.2 for each of the two (2) one (1)-hour rated walls penetrated. The two (2)-hour fire resistance-rated common wall shall not contain plumbing or mechanical equipment, ducts or vents within its wall cavity. The wall shall be rated for fire exposure from both sides, and shall extend to and be tight against the exterior walls and the underside of the roof sheathing. Penetrations of electrical outlet boxes shall be in accordance with Section R302.4. h. Delete IRC 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 M1507.3 Exception: Where the air infiltration rate of a dwelling unit is equal to 5 air changes per hour or greater when tested with a blower door at a pressure of 0.2 inch w.c. (50 pa) in accordance with Section N1102.4.1.2. i. Delete the exception contained under IRC 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 exception 2 of section R302.2 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. j. Delete IRC section R313.2. Idaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Page 4 of 8 k. Add the following to IRC section R315.3 - Where required in existing dwellings: 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; and 2. Installation, alteration or repairs of noncombustion plumbing or mechanical systems are exempt from the requirements of this section. l. Delete IRC section R322.1.10. m. Delete IRC section R322.2.2 subparagraph 2.2, and replace with the following: 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. n. Delete IRC section R501.3 and its exceptions. o. Delete IRC section R602.10 and replace with the following: 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 designated and constructed in accordance with section R301.1. p. Chapter 11 [RE] Energy Efficiency - The following sections and tables of chapter 11 shall be amended in accordance with the requirements contained below in Subsection 004.04 of these rules which correspond to the appropriate section: i. Table N1102.1.1 (Table R402.1.1) - Insulation and Fenestration Requirements by Component; ii. Table N1102.1.3 (Table R402.1.3 - Equivalent U-Factors; iii. Table N1102.2.6 (Table R402.2.6) - Steel-Frame Ceiling, Wall and Floor Insulation (R-Value); iv. Section N1102.4.1 (R402.4.1) Building Thermal Envelope; v. Section N1102.4.1.1 (R402.4.1.1) - Insulation; vi. Table N1102.4.1.1 (Table R402.4.1.1) - Air Barrier and Insulation Installation; vii. Section N1102.4.1.2 (R402.4.1.2) Testing Option; viii. Add Section N1102.4.1.3 (R402.4.1.3) - Visual Inspection Option; ix. Add Section N1102.6 (R402.6) - Residential Log Home Thermal Envelope; x. Add Table N1102.6 (Table R402.6) - Log Home Prescriptive Thermal Envelope Requirements by Component; and xi. Section N1104.1 (R404.1) - Lighting Equipment. Idaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Page 5 of 8 03. International Existing Building Code. 2015 Edition. 04. International Energy Conservation Code. 2015 Edition with the following amendments: a. Delete the Residential Provisions of the 2015 International Energy Conservation Code (IECC) set forth in chapters 1 [RE] through 6 [RE], including Appendix RA (pages R-1 through R-57), and replace with the Residential Provisions of the 2012 IECC set forth therein in chapters 1 [RE] through 5 [RE] (pages R-1 through R- 47) and as such provisions may be further amended herein these rules. b. Add the following as new subsection C101.5.3: 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. c. Add the following exception No. (10) under section C403.3 Economizers (Prescriptive): 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. d. Delete the values contained in Table R402.1.1 (Table N1102.1.1) for climate zone “5 and Marine 4” and climate zone “6” and replace with the following: TABLE R402.1.1 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT Climate Zone Fenestration U- Factor Skylight U-factor Glazed Fenestration SHGC Ceiling R-Value Wood Frame Wall R-Value Mass Wall R-Value Floor R-Value Basement Wall R-Value Slab R-Value Crawlspace Wall R-Value 5 and Marine 4 0.35 0.60 NR 38 20 or 13+5h 13/17 30g 10/13 10, 2 ft 10/13 6 0.35 0.60 NR 49 20 or 13+5h 15/19 30g 15/19 10, 4 ft 10/13 e. Add the following footnote to the title of Table R402.1.1 - Insulation and Fenestration Requirements by Component: k. For residential log home building thermal envelope construction requirements see section R402.6. f. Delete the values contained in Table R402.1.3 (Table N1102.1.3) for climate zone “5 and Marine 4” and climate zone “6” and replace with the following: TABLE R402.1.3 EQUIVALENT U-FACTORS Idaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Page 6 of 8 Climate Zone Fenestration U-factor Skylight U-factor Ceiling R-Value Wood Frame Wall R-Value Mass Wall R-Value Floor R-Value Basement Wall R-Value Crawlspace Wall R-Value 5 and Marine 4 0.35 0.60 0.030 0.057 0.082 0.033 0.059 0.065 6 0.35 0.60 0.026 0.057 0.060 0.033 0.050 0.065 g. Delete Table R402.2.6 (Table N1102.2.6) and replace with the following: TABLE R402.2.6 STEEL-FRAME CEILING, WALL AND FLOOR INSULATION (R-VALUE) Wood Frame R-value Requirement Cold-formed Steel Equivalent R-valuea Steel Truss Ceilingsb R-30 R-38 or R-30 + 3 or R-26 + 5 R-38 R-49 or R-38 +3 R-49 R-38 + 5 Steel Joist Ceilingsb R-30 R-38 in 2 x 4 or 2 x 6 or 2 x 8 R-49 in any framing R-38 R-49 in 2 x 4 or 2 x 6 or 2 x 8 or 2 x 10 Steel-Framed Wall R-13 R-13 + 5 or R-15 + 4 or R-21 + 3 or R-0 + 10 R-19 R-13 + 9 or R-19 + 8 or R-25 + 7 R-21 R-13 + 10 or R-19 + 9 or R-25 + 8 Steel Joist Floor R-13 R-19 in 2 x 6 R-19 + 6 in 2 x 8 or 2 x 10 R-19 R-19 + 6 in 2 x 6 R-19 + 12 in 2 x 8 or 2 x 10 a. Cavity insulation R-value is listed first, followed by continuous insulation R-value. b. Insulation exceeding the height of the framing shall cover the framing. h. Delete section R402.4.1 (N1102.4.1) and replace with the following: Building thermal envelope. The building thermal envelope shall comply with sections R402.1.1 and either section R402.4.1.2 or R402.4.1.3. The sealing methods between dissimilar materials shall allow for differential expansion and contraction. i. Delete section R402.4.1.1 (N1102.4.1.1) and replace with the following: 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. Idaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Page 7 of 8 j. Delete the criteria requirement for the “Fireplace” component of Table R402.4.1.1 (Table N1102.4.1.1) - Air Barrier and Insulation Installation, and replace with the following: An air barrier shall be installed on fireplace walls. k. Delete section R402.4.1.2 (N1102.4.1.2) and replace with the following: Testing option, Building envelope tightness and insulation installation shall be considered acceptable when tested air leakage is less than seven (7) 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. During testing: i. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed; ii. Dampers shall be closed, but not sealed, including exhaust, intake, makeup air, backdraft and flue dampers; iii. Interior doors shall be open; iv. Exterior openings for continuous ventilation systems and heat recovery ventilators shall be closed and sealed; v. Heating and cooling system(s) shall be turned off; vi. HVAC ducts shall not be sealed; and vii. Supply and return registers shall not be sealed. l. Add the following as section R402.4.1.3 (N1102.4.1.3): Visual inspection option, 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. m. Add the following section: R402.6 (N1102.6) Residential Log Home Thermal Envelope. Residential log home construction shall comply with sections R401 (General), R402.4 (Air Leakage), R402.5 (Maximum Fenestration U-Factor and SHGC), R403.1 (Controls), R403.2.2 (Sealing), R403.2.3 (Building Cavities), sections R403.3 through R403.9 (referred to as the mandatory provisions), Section R404 (Electrical Power and Lighting Systems), and either i., ii., or iii. as follows: i. Sections R402.2 through R402.3, R403.2.1, R404.1 and Table R402.6; ii. Section R405 Simulated Performance Alternative (Performance); or iii. REScheck (U.S. Department of Energy Building Codes Program). n. Add Table R402.6 (Table N1102.6) Log Home Prescriptive Thermal Envelope Requirements By Component to be used only in accordance with item i. of section R402.6 above to appear as follows: TABLE R402.6 LOG HOME PRESCRIPTIVE THERMAL ENVELOPE REQUIREMENTS BY COMPONENT For SI: 1 foot = 304.8 mm. Idaho Amendments to the 2015 IBC. Idaho Amendments to the 2012 IRC, 2012 IECC Residential Provisions as of 1 January 2018 known at the 2017 editions of the Idaho Residential Code and the Idaho Energy Conservation Code. Page 8 of 8 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-valued Slab R-value & Depthb Crawl Space Wall R-valued 5, 6 - High efficiency equipment pathc 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 a. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. b. R-5 shall be added to the required slab edge R-values for heated slabs. c. 90% 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 sheath- ing on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall. o. Delete section R404.1 (N1104.1) and replace with the following: Lighting equipment (Mandatory). A minimum of fifty percent (50%) of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps or a minimum of fifty percent (50%) of the permanently installed lighting fixtures shall contain only high efficacy lamps.