Page 106 - 2018_IRC

BUILDING PLANNING

between foam plastics installed above grade and exposed R321.2 Platform lifts. Where provided, platform lifts shall
earth shall be not less than 6 inches (152 mm). comply with ASME A18.1.
Exceptions: R321.3 Accessibility. Elevators or platform lifts that are part
1. Buildings where the structural members of walls, of an accessible route required by Chapter 11 of the Interna-
floors, ceilings and roofs are entirely of noncombus- tional Building Code, shall comply with ICC A117.1.
tible materials or pressure-preservative-treated
wood.
SECTION R322
2. Where in addition to the requirements of Section FLOOD-RESISTANT CONSTRUCTION
R318.1, an approved method of protecting the foam R322.1 General. Buildings and structures constructed in
plastic and structure from subterranean termite dam- whole or in part in flood hazard areas, including A or V
age is used.
Zones and Coastal A Zones, as established in Table
3. On the interior side of basement walls. R301.2(1), and substantial improvement and repair of sub-
stantial damage of buildings and structures in flood hazard
areas, shall be designed and constructed in accordance with
SECTION R319 the provisions contained in this section. Buildings and struc-
SITE ADDRESS tures that are located in more than one flood hazard area shall
R319.1 Address identification. Buildings shall be provided comply with the provisions associated with the most restric-
with approved address identification. The address identifica- tive flood hazard area. Buildings and structures located in
tion shall be legible and placed in a position that is visible whole or in part in identified floodways shall be designed and
from the street or road fronting the property. Address identifi- constructed in accordance with ASCE 24.
cation characters shall contrast with their background. R322.1.1 Alternative provisions. As an alternative to the
Address numbers shall be Arabic numbers or alphabetical let- requirements in Section R322, ASCE 24 is permitted sub-
ters. Numbers shall not be spelled out. Each character shall be ject to the limitations of this code and the limitations
not less than 4 inches (102 mm) in height with a stroke width therein.
of not less than 0.5 inch (12.7 mm). Where required by the
fire code official, address identification shall be provided in R322.1.2 Structural systems. Structural systems of build-
additional approved locations to facilitate emergency ings and structures shall be designed, connected and
response. Where access is by means of a private road and the anchored to resist flotation, collapse or permanent lateral
building address cannot be viewed from the public way, a movement due to structural loads and stresses from flood-
monument, pole or other sign or means shall be used to iden- ing equal to the design flood elevation.
tify the structure. Address identification shall be maintained. R322.1.3 Flood-resistant construction. Buildings and
structures erected in areas prone to flooding shall be con-
structed by methods and practices that minimize flood
SECTION R320 damage.
ACCESSIBILITY
R322.1.4 Establishing the design flood elevation. The
R320.1 Scope. Where there are four or more dwelling units design flood elevation shall be used to define flood hazard
or sleeping units in a single structure, the provisions of Chap- areas. At a minimum, the design flood elevation shall be
ter 11 of the International Building Code for Group R-3 shall the higher of the following:
apply.
1. The base flood elevation at the depth of peak eleva-
R320.1.1 Guestrooms. A dwelling with guestrooms shall tion of flooding, including wave height, that has a 1-
comply with the provisions of Chapter 11 of the Interna- percent (100-year flood) or greater chance of being
tional Building Code for Group R-3. For the purpose of equaled or exceeded in any given year.
applying the requirements of Chapter 11 of the Interna- 2. The elevation of the design flood associated with the
tional Building Code, guestrooms shall be considered to
be sleeping units. area designated on a flood hazard map adopted by
the community, or otherwise legally designated.
Exception: Owner-occupied lodging houses with five
or fewer guestrooms constructed in accordance with the R322.1.4.1 Determination of design flood elevations.
International Residential Code are not required to be If design flood elevations are not specified, the building
accessible. official is authorized to require the applicant to comply
with either of the following:
1. Obtain and reasonably use data available from a
SECTION R321 federal, state or other source.
ELEVATORS AND PLATFORM LIFTS 2. Determine the design flood elevation in accor-
R321.1 Elevators. Where provided, passenger elevators, lim- dance with accepted hydrologic and hydraulic
ited-use and limited-application elevators or private residence engineering practices used to define special flood
elevators shall comply with ASME A17.1/CSA B44. hazard areas. Determinations shall be undertaken

2018 INTERNATIONAL RESIDENTIAL CODE ® 81
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.