Page 42 - ICC IEBC 2018

CHAPTER 5
PRESCRIPTIVE COMPLIANCE METHOD

User note:
About this chapter: Chapter 5 provides details for the prescriptive compliance method—one of the three main options of compliance avail-
able in this code for buildings and structures undergoing alteration, addition or change of occupancy.

SECTION 501 shall comply with the height and area provisions of Chapter 5
GENERAL of the International Building Code.
501.1 Scope. The provisions of this chapter shall control the [BS] 502.2 Disproportionate earthquake damage. A build-
alteration, addition and change of occupancy of existing ing assigned to Seismic Design Category D, E or F that has
buildings and structures, including historic buildings and sustained disproportionate earthquake damage shall be sub-
structures as referenced in Section 301.3.2. ject to the requirements for buildings with substantial struc-
tural damage to vertical elements of the lateral force-resisting
Exception: Existing bleachers, grandstands and folding
and telescopic seating shall comply with ICC 300. system.
[BS] 502.3 Flood hazard areas. For buildings and structures
501.1.1 Compliance with other methods. Alterations,
additions and changes of occupancy to existing buildings in flood hazard areas established in Section 1612.3 of the
and structures shall comply with the provisions of this International Building Code, or Section R322 of the Interna-
chapter or with one of the methods provided in Section tional Residential Code, as applicable, any addition that con-
* 301.3. stitutes substantial improvement of the existing structure
shall comply with the flood design requirements for new con-
501.2 Fire-resistance ratings. Where approved by the code struction, and all aspects of the existing structure shall be
official, in buildings where an automatic sprinkler system brought into compliance with the requirements for new con-
installed in accordance with Section 903.3.1.1 or 903.3.1.2 of struction for flood design.
the International Building Code has been added, and the For buildings and structures in flood hazard areas estab-
building is now sprinklered throughout, the required fire- lished in Section 1612.3 of the International Building Code,
resistance ratings of building elements and materials shall be
permitted to meet the requirements of the current building or Section R322 of the International Residential Code, as
code. The building is required to meet the other applicable applicable, any additions that do not constitute substantial
improvement of the existing structure are not required to
requirements of the International Building Code.
comply with the flood design requirements for new construc-
Plans, investigation and evaluation reports, and other data tion.
shall be submitted indicating which building elements and [BS] 502.4 Existing structural elements carrying gravity
materials the applicant is requesting the code official to load. Any existing gravity load-carrying structural element
review and approve for determination of applying the current for which an addition and its related alterations cause an
building code fire-resistance ratings. Any special construc- increase in design dead, live or snow load, including snow
tion features, including fire-resistance-rated assemblies and drift effects, of more than 5 percent shall be replaced or
smoke-resistive assemblies, conditions of occupancy, means altered as needed to carry the gravity loads required by the
of egress conditions, fire code deficiencies, approved modifi- International Building Code for new structures. Any existing
cations or approved alternative materials, design and methods gravity load-carrying structural element whose vertical load-
of construction, and equipment applying to the building that carrying capacity is decreased as part of the addition and its
impact required fire-resistance ratings shall be identified in related alterations shall be considered to be an altered ele-
the evaluation reports submitted.
ment subject to the requirements of Section 503.3. Any exist-
ing element that will form part of the lateral load path for any
part of the addition shall be considered to be an existing lat-
SECTION 502 eral load-carrying structural element subject to the require-
ADDITIONS
ments of Section 502.5.
502.1 General. Additions to any building or structure shall Exception: Buildings of Group R occupancy with not
comply with the requirements of the International Building more than five dwelling or sleeping units used solely for
Code for new construction. Alterations to the existing build- residential purposes where the existing building and the
ing or structure shall be made to ensure that the existing addition together comply with the conventional light-
building or structure together with the addition are not less frame construction methods of the International Building
complying with the provisions of the International Building Code or the provisions of the International Residential
Code than the existing building or structure was prior to the Code.
addition. An existing building together with its additions

2018 INTERNATIONAL EXISTING BUILDING CODE ® 23
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