Page 52 - ICC IEBC 2018

ALTERATIONS—LEVEL 1

3. Metal panel, metal shingle and concrete and clay tile 2. Buildings in which the increased dead load is due
roof coverings are installed over existing wood entirely to the addition of a second layer of roof cov-
shake roofs in accordance with Section 705.4. ering weighing 3 pounds per square foot (0.1437
2
4. A new protective roof coating is applied over an kN/m ) or less over an existing single layer of roof
existing protective roof coating, a metal roof panel, covering.
metal roof shingles, mineral-surfaced roll roofing, a [BS] 706.3 Additional requirements for reroof permits.
built-up roof, modified bitumen roofing, thermoset The requirements of this section shall apply to alteration
and thermoplastic single-ply roofing or a spray poly- work requiring reroof permits.
urethane foam roofing system. [BS] 706.3.1 Bracing for unreinforced masonry bear-
[BS] 705.3.1.1 Exceptions. A roof recover shall not be ing wall parapets. Where a permit is issued for reroofing
permitted where any of the following conditions occur: for more than 25 percent of the roof area of a building
assigned to Seismic Design Category D, E or F that has
1. The existing roof or roof covering is water
soaked or has deteriorated to the point that the parapets constructed of unreinforced masonry, the work
existing roof or roof covering is not adequate as a shall include installation of parapet bracing unless an eval-
base for additional roofing. uation demonstrates compliance of such items. Reduced
seismic forces shall be permitted.
2. The existing roof covering is slate, clay, cement
or asbestos-cement tile. [BS] 706.3.2 Roof diaphragms resisting wind loads in
high-wind regions. Where roofing materials are removed
3. The existing roof has two or more applications of
from more than 50 percent of the roof diaphragm or sec-
any type of roof covering. tion of a building located where the ultimate design wind
[BS] 705.4 Roof recovering. Where the application of a new speed, V , determined in accordance with Figure
ult
roof covering over wood shingle or shake roofs creates a 1609.3(1) of the International Building Code, is greater
combustible concealed space, the entire existing surface shall than 115 mph (51 m/s) or in a special wind region, as
be covered with gypsum board, mineral fiber, glass fiber or defined in Section 1609 of the International Building
other approved materials securely fastened in place. Code, roof diaphragms, connections of the roof diaphragm
[BS] 705.5 Reinstallation of materials. Existing slate, clay to roof framing members, and roof-to-wall connections
or cement tile shall be permitted for reinstallation, except that shall be evaluated for the wind loads specified in the Inter-
damaged, cracked or broken slate or tile shall not be rein- national Building Code, including wind uplift. If the dia-
stalled. Existing vent flashing, metal edgings, drain outlets, phragms and connections in their current condition are not
collars and metal counterflashings shall not be reinstalled capable of resisting 75 percent of those wind loads, they
where rusted, damaged or deteriorated. Aggregate surfacing shall be replaced or strengthened in accordance with the
materials shall not be reinstalled. loads specified in the International Building Code.
[BS] 705.6 Flashings. Flashings shall be reconstructed in
accordance with approved manufacturer’s installation SECTION 707
instructions. Metal flashing to which bituminous materials ENERGY CONSERVATION
are to be adhered shall be primed prior to installation.
707.1 Minimum requirements. Level 1 alterations to exist-
ing buildings or structures do not require the entire building
or structure to comply with the energy requirements of the
SECTION 706
STRUCTURAL International Energy Conservation Code or International
Residential Code. The alterations shall conform to the energy
[BS] 706.1 General. Where alteration work includes requirements of the International Energy Conservation Code
replacement of equipment that is supported by the building or or International Residential Code as they relate to new con-
where a reroofing permit is required, the provisions of this
struction only.
section shall apply.
[BS] 706.2 Addition or replacement of roofing or replace-
ment of equipment. Any existing gravity load-carrying
structural element for which an alteration causes an increase
in design dead, live or snow load, including snow drift
effects, of more than 5 percent shall be replaced or altered as
needed to carry the gravity loads required by the Interna-
tional Building Code for new structures.
Exceptions:
1. Buildings of Group R occupancy with not more than
five dwelling or sleeping units used solely for resi-
dential purposes where the altered building complies
with the conventional light-frame construction
methods of the International Building Code or the
provisions of the International Residential Code.

2018 INTERNATIONAL EXISTING BUILDING CODE ® 33
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