Page 47 - ICC IEBC 2018

PRESCRIPTIVE COMPLIANCE METHOD

satisfy the requirements of Section 1607 of the Interna- another structure, access protection from potential falling
tional Building Code. Design live loads for areas of new debris shall be provided.
occupancy shall be based on Section 1607 of the Interna-
tional Building Code. Design live loads for other areas
shall be permitted to use previously approved design live SECTION 507
loads. HISTORIC BUILDINGS
Exception: Structural elements whose demand-capac- 507.1 Historic buildings. The provisions of this code that
ity ratio considering the change of occupancy is not require improvements relative to a building’s existing condi-
more than 5 percent greater than the demand-capacity tion or, in the case of repairs, that require improvements rela-
ratio based on previously approved live loads need not tive to a building’s predamage condition, shall not be
comply with this section. mandatory for historic buildings unless specifically required
by this section.
506.4.2 Snow and wind loads. Where a change of occu-
pancy results in a structure being assigned to a higher risk 507.2 Life safety hazards. The provisions of this code shall
category, the structure shall satisfy the requirements of apply to historic buildings judged by the building official to
Sections 1608 and 1609 of the International Building constitute a distinct life safety hazard.
Code for the new risk category.
[BS] 507.3 Flood hazard areas. Within flood hazard areas
Exception: Where the area of the new occupancy is established in accordance with Section 1612.3 of the Interna-
less than 10 percent of the building area, compliance tional Building Code, or Section R322 of the International
with this section is not required. The cumulative effect Residential Code, as applicable, where the work proposed
of occupancy changes over time shall be considered. constitutes substantial improvement, the building shall be
506.4.3 Seismic loads (seismic force-resisting system). brought into compliance with Section 1612 of the Interna-
Where a change of occupancy results in a building being tional Building Code, or Section R322 of the International
assigned to a higher risk category, the building shall sat- Residential Code, as applicable.
isfy the requirements of Section 1613 of the International Exception: Historic buildings meeting any of the follow-
Building Code for the new risk category using full seismic ing criteria need not be brought into compliance:
forces.
1. Listed or preliminarily determined to be eligible for
Exceptions: listing in the National Register of Historic Places.
1. Where the area of the new occupancy is less than 2. Determined by the Secretary of the U.S. Department
10 percent of the building area and the new occu- of Interior as contributing to the historical signifi-
pancy is not assigned to Risk Category IV, com- cance of a registered historic district or a district pre-
pliance with this section is not required. The liminarily determined to qualify as an historic
cumulative effect of occupancy changes over district.
time shall be considered.
3. Designated as historic under a state or local historic
2. Where a change of use results in a building being preservation program that is approved by the
reclassified from Risk Category I or II to Risk Department of Interior.
Category III and the seismic coefficient, S , is
DS [BS] 507.4 Structural. Historic buildings shall comply with
less than 0.33, compliance with this section is not
required. the applicable structural provisions in this chapter.
Exceptions:
3. Unreinforced masonry bearing wall buildings
assigned to Risk Category III and to Seismic 1. The code official shall be authorized to accept exist-
Design Category A or B, shall be permitted to use ing floors and existing live loads and to approve
Appendix Chapter A1 of this code. operational controls that limit the live load on any
floor.
506.4.4 Access to Risk Category IV. Any structure that
provides operational access to an adjacent structure 2. Repair of substantial structural damage is not
assigned to Risk Category IV as the result of a change of required to comply with Sections 405.2.3, and
occupancy shall itself satisfy the requirements of Sections 405.2.4. Substantial structural damage shall be
1608, 1609 and 1613 of the International Building Code. repaired in accordance with Section 405.2.1.
For compliance with Section 1613, International Building
Code-level seismic forces shall be used. Where opera-
tional access to the Risk Category IV structure is less than
10 feet (3048 mm) from either an interior lot line or from *

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