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CITY OF MERCER ISLAND
9611 SE 36th Street, Mercer Island, Washington 98040-3732
PHONE (206) 236-5300 FAX (206) 236-3645 TDD (206) 232-9598
www.ci.mercer-island.wa.us
INTERNATIONAL BUILDING CODE - ADOPTION AND
AMENDMENTS
Effective July 1, 2004
The 2003 edition of the International Building Code (IBC), as adopted and amended
by the State Building Code Council in Chapter 51-50 WAC, as published by the
International Code Council, excluding Chapter 1 “Administration,” is adopted by
reference, together with the following amendments and additions. The Construction
Administrative Code, as set forth in MICC Chapter 17.14, shall be used in place of
IBC Chapter 1, Administration.
The following Appendices of the 2003 edition of the International Building Code are
also adopted by reference: Appendix E – Supplementary Accessibility Requirements,
Sections 101 through 106 only and Appendix H – Signs.
Amendments and Additions.
A. IBC Section 312.1 Amended – Utility and Miscellaneous Group U, General.
Section 312.1 of the International Building Code is hereby amended to read as
follows:
Section 312.1 – General. Buildings and structures of an accessory character and
miscellaneous structures not classified in any specific occupancy shall be
constructed, equipped and maintained to conform to the requirements of this code
commensurate with the fire and life hazard incidental to their occupancy. Group
U shall include, but not be limited to, the following:
Agricultural buildings
Aircraft hangars, accessory to a one- or two-family residence (see Section
412.3)
Barns
Carports
Fences more than 6 feet (1829 mm) high
Grain silos, accessory to a residential occupancy
Greenhouses
Livestock shelters private garages
Retaining walls
Sheds
Stables
Tanks
Towers
Waterfront structures
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B. IBC Section 405.9 Amended – Underground Buildings, Standby power.
Section 405.9 of the International Building Code is hereby amended to read as
follows:
Section 405.9 – Standby power. A standby power system complying with
Section 2702 shall be provided for standby power loads specified in Section
405.9.1. Fuel-fired emergency generator sets and associated fuel storage,
including optional generator sets, located more than 30 feet below the lowest level
of exit discharge requires the approval of the Fire Code Official.
C. IBC Section 501.2 Amended – General Building Heights and Areas, General,
Premises identification. Section 501.2 of the International Building Code is
hereby amended to read as follows:
Section 501.2 - Premises identification. Approved numbers or addresses shall
be provided for new buildings in such a position as to be clearly visible and
legible from the street or roadway fronting the property. Letters or numbers shall
be a minimum 6 inches (152mm) in height and stroke of minimum 0.5 inch
(12.7mm) of contrasting color to the background itself.
D. IBC Section 707.2 Amended – Shaft Enclosures, Shaft enclosure required.
Section 707.2, Exception 2.1 of the International Building Code is hereby
amended to read as follows:
Section 707.2 - Shaft enclosure required, Exception 2.1. Where the area of the
floor opening between stories does not exceed twice the horizontal projected area
of the escalator or stairway and the opening is protected by a draft curtain and
closely spaced sprinklers in accordance with NFPA 13. This application is
limited to openings that do not connect more than four stories in buildings not
required to have smoke control systems. In buildings that are required to have
smoke control systems, escalators are limited to openings that do not connect
more than four stories and non-egress stairs are limited to openings that do not
atmospherically connect more than two stories in buildings that are required to
have smoke control systems.
E. IBC Section 1605.3.1.1 Amended – Load Combinations, Load Reduction.
Section 1605.3.1.1 of the International Building Code is hereby amended to read
as follows:
Section 1605.3.1.1 - Load Reduction. It is permitted to multiply the combined
effect of two or more variable loads by 0.75 and add to the effect of dead load.
The combined load used in design shall not be less than the sum of the effects of
dead load and any one of the variable loads.
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Increases in allowable stresses specified in the appropriate materials section of
this code or referenced standard shall not be used with the load combinations of
Section 1605.3.1 except that a duration of load increase shall be permitted in
accordance with Chapter 23.
F. IBC Section 1608.1-Amended – Snow Loads, General. Section 1608.1 of the
International Building Code is hereby amended to read as follows:
Section 1608.1 – General. Design snow loads shall not be less than 25 psf, but
the design roof loads shall not be less than that determined by Section 1607.
G. IBC Section 1704.1 Amended – Special Inspections, General. Section 1704.1
of the International Building Code is hereby amended by deleting Exception 3
that exempts special inspection requirements for R-3 and U occupancies to read as
follows:
Section 1704.1 - General. Where application is made for construction as
described in this section, the owner or the registered design professional in
responsible charge acting as the owner’s agent shall employ one or more special
inspectors to provide inspections during construction on the types of work listed
under Section 1704. The special inspector shall be a qualified person who shall
demonstrate competence, to the satisfaction of the building official, for inspection
of the particular type of construction or operation requiring special inspection.
These inspections are in addition to the inspections specified in Section 109.
Exceptions:
1. Special inspections are not required for work of a minor nature or as
warranted by conditions in the jurisdiction as approved by the building
official.
2. Special inspections are not required for building components unless the
design involves the practice of professional engineering or architecture as
defined by applicable state statutes and regulations governing the
professional registration and certification of engineers or architects.
H. IBC Section 1704.12 Amended – Special Inspections, Exterior insulation and
finish systems (EIFS). Section 1704.12 of the International Building Code is
hereby amended to read as follows:
IBC Section 1704.12 - Exterior insulation and finish systems (EIFS). Special
inspections shall be required for all EIFS applications. All EIFS applications
shall be certified by the manufacturer as having been installed per the
manufacturer’s installation recommendations or other agency approved by the
building official. The manufacturer certification shall serve as the special
inspection requirement when approved by the building official.
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I. IBC Table 2306.4.1, Footnote “i” Amended – Allowable Stress Design,
Allowable Shear, etc., Table 2306.4.1, Footnote “i” of the International Building
Code is hereby amended to read as follows:
Table 2306.4.1, Allowable Shear for Wood Structural Panel Shear Walls,
etc., Footnote “i”. In Seismic Design Category D, E or F, where shear design
values exceed 490 pounds per lineal foot (LRFD) or 350 pounds per lineal foot
(ASD) all framing members receiving edge nailing from abutting panels shall not
be less than a single 3-inch nominal member, or two 2-inch nominal members
fastened together in accordance with Section 2307.1 (LRFD) or Section 2306.1
(ASD) to transfer the design shear value between the framing members. Plywood
joint and sill plate nailing shall be staggered in all cases. See Section 2305.3.10
for sill plate side and anchorage requirements.
J. IBC Section 3110 Added – Waterfront Structures. Section 3110 of the
International Building Code is hereby added to read as follows:
SECTION 3110 – WATERFRONT STRUCTURES
Section 3110.1 General. In addition to other requirements of this code, all
waterfront structures including, but not limited to docks, piers, wharves, floats,
mooring piles, anchor buoys, bulkheads, submerged or overhead wires, pipes, and
cables, and any object passing beneath, through or over the water beyond the line
of ordinary high water shall comply with the regulations of this section.
Section 3110.2. Approvals required. Before any permit for a new waterfront
structure or revisions to an existing waterfront structure is issued by the building
official, the applicant shall obtain prior approval from all applicable state and
federal agencies.
Section 3110.3 Definitions. For the purposes of this section, certain terms are
defined as follows:
BULKHEAD. A retaining wall or erosion-control structure along a waterfront.
COVERED WATERFRONT STRUCTURE. Any waterfront structure covered
in whole or in part by a roof.
COVERED WATERFRONT STRUCTURE BUILDING AREA. The area
lying directly beneath the portion of a structure covered by a roof.
SUBSTRUCTURE. That portion of the construction of a dock, pier, wharf or
other similar waterfront structure below and including the deck.
SUPERSTRUCTURE. That portion of the construction of a dock, pier, wharf or
other similar waterfront structure above the deck.
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Section 3110.4 Construction Requirements. Waterfront structures shall comply
with Sections 3110.4.1 through 3110.4.3.
Section 3110.4.1 Substructure. The substructure may be constructed of any
materials allowed by this code. All decks shall sustain, within the limitations
of this code, all dead loads plus a live load of not less than 100 pounds per
square foot, assumed to act vertically. In addition to the live load requirement,
all structures and every portion thereof shall be designed and constructed to
resist a horizontal force of not less than 100 pounds per lineal foot acting at
the deck line, in any direction.
Exception: For waterfront structures serving only a single dwelling, a
live load of 40 psf may be used and a horizontal force need only be
considered where applicable.
Section 3110. 4.2 Superstructure. The superstructure shall be designed and
constructed to sustain all dead loads, live loads, and wind loads required by
this code, and shall be constructed of any materials allowed by this code,
except when the building area of a covered waterfront structure exceeds 1,000
square feet the entire superstructure and deck shall be constructed of
noncombustible materials or as required for Type IV-HT Construction per
IBC Section 602.4.
Section 3110.4.3 Hardware. All hardware used structurally shall be of a
corrosive-resistant metal such as aluminum, brass, copper, and stainless steel,
or be completely protected by a coating of approved paint or corrosive-
resistant metal, such as zinc.
K. IBC Appendix H, Section H101.3, Added – Signs, General, Conflict with
Mercer Island City Code. Appendix H, Section H101.3 of the International
Building Code is hereby added to read as follows:
Section H101.3, Conflict with Mercer Island City Code. If any provisions of
IBC Appendix H are in conflict with any provisions of the Mercer Island City
Code, the applicable provisions of the Mercer Island City Code shall govern.
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