International Building Code Section 1504


International Building Code 1504.1

Wind resistance of roofs. Roof decks and roof coverings
shall be designed for wind loads in accordance with Chapter
16 and Sections 1504.2, 1504.3 and 1504.4.

Wind resistance of asphalt shingles. Asphalt
shingles shall be installed in accordance with Section
1507.2.7. For roofs located where the basic wind speed in
accordance with Figure 1609 is 110 mph or greater, asphalt
shingles shall be tested in accordance with ASTM D 3161,
Class F. As an alternative, load and wind resistance of
asphalt shingle roof coverings shall be determined in accordance
with Section 1609.5.2.

International Building Code 1504.1.1

Wind resistance of asphalt shingles. Asphalt
shingles shall be installed in accordance with Section
1507.2.7. For roofs located where the basic wind speed in
accordance with Figure 1609 is 110 mph or greater, asphalt
shingles shall be tested in accordance with ASTM D 3161,
Class F. As an alternative, load and wind resistance of
asphalt shingle roof coverings shall be determined in accordance
with Section 1609.5.2.

International Building Code 1504.2

Wind resistance of clay and concrete tile. Clay and
concrete tile roof coverings shall be connected to the roof deck
in accordance with Chapter 16.

Alternative test method. Testing the acceptability
of special fastening methods using the methodology in
this section is permitted. The wind-induced uplift force on
the shingle shall be determined using the method in UL
2390. The resistance of the shingle to the uplift force shall
be determined using ASTM D 6381. Shingles passing this
test shall be considered suitable for roofs located where the
basic wind speed per Figure 1609 is as given in Table
1504.2.1.
Classification requires that the resistance of the shingle to
wind uplift, measured using the method in ASTM D 6381,
exceed the calculated load imposed by wind in the applicable
zone as determined using UL 2390.
Classification by this method applies to buildings less
than 60 feet (18 288 mm) high and withWind Exposures B
and Conly in an Occupancy Category of I or II. Wrappers of
shingle bundles that have been qualified using this alternative
method shall be labeled with the tested wind classification
and reference UL 2390/ASTM D 6381.

International Building Code 1504.2.1

Alternative test method. Testing the acceptability
of special fastening methods using the methodology in
this section is permitted. The wind-induced uplift force on
the shingle shall be determined using the method in UL
2390. The resistance of the shingle to the uplift force shall
be determined using ASTM D 6381. Shingles passing this
test shall be considered suitable for roofs located where the
basic wind speed per Figure 1609 is as given in Table
1504.2.1.
Classification requires that the resistance of the shingle to
wind uplift, measured using the method in ASTM D 6381,
exceed the calculated load imposed by wind in the applicable
zone as determined using UL 2390.
Classification by this method applies to buildings less
than 60 feet (18 288 mm) high and withWind Exposures B
and Conly in an Occupancy Category of I or II. Wrappers of
shingle bundles that have been qualified using this alternative
method shall be labeled with the tested wind classification
and reference UL 2390/ASTM D 6381.

International Building Code 1504.3

Wind resistance of nonballasted roofs. Roof coverings
installed on roofs in accordance with Section 1507 that are
mechanically attached or adhered to the roof deck shall be
designed to resist the design wind load pressures for cladding
in Chapter 16.

Other roof systems. Roof systems with built-up,
modified bitumen, fully adhered or mechanically attached
single-ply through fastened metal panel roof systems, and
other types of membrane roof coverings shall also be tested
in accordance with FM 4450, FM 4470, UL 580 or UL
1897.

Metal panel roof systems. Metal panel roof systems
through fastened or standing seam shall be tested in
accordance with UL 580 or ASTM E 1592.
Exception: Metal roofs constructed of cold-formed
steel, where the roof deck acts as the roof covering and
provides both weather protection and support for structural
loads, shall be permitted to be designed and tested
in accordance with the applicable referenced structural
design standard in Section 2209.1.

International Building Code 1504.3.1

Other roof systems. Roof systems with built-up,
modified bitumen, fully adhered or mechanically attached
single-ply through fastened metal panel roof systems, and
other types of membrane roof coverings shall also be tested
in accordance with FM 4450, FM 4470, UL 580 or UL
1897.

International Building Code 1504.3.2

Metal panel roof systems. Metal panel roof systems
through fastened or standing seam shall be tested in
accordance with UL 580 or ASTM E 1592.
Exception: Metal roofs constructed of cold-formed
steel, where the roof deck acts as the roof covering and
provides both weather protection and support for structural
loads, shall be permitted to be designed and tested
in accordance with the applicable referenced structural
design standard in Section 2209.1.

International Building Code 1504.4

Ballasted low-slope roof systems. Ballasted low-slope
(roof slope < 2:12) single-ply roof system coverings installed
in accordance with Section 1507 shall be designed in accordance
with Section 1504.8 and ANSI/SPRI RP-4.

International Building Code 1504.5

Edge securement for low-slope roofs. Low-slope
membrane roof system metal edge securement, except gutters,
shall be designed and installed for wind loads in accordance
with Chapter 16 and tested for resistance in accordance with
ANSI/SPRI ES-1, except the basic wind speed shall be determined
from Figure 1609.

International Building Code 1504.6

Physical properties. Roof coverings installed on
low-slope roofs (roof slopeĀ ??2:12) in accordance with Section
1507 shall demonstrate physical integrity over the working life
of the roof based upon 2,000 hours of exposure to accelerated
weathering tests conducted in accordance with ASTM G 152,
ASTM G 155 or ASTM G 154. Those roof coverings that are
subject to cyclical flexural response due to wind loads shall not
demonstrate any significant loss of tensile strength for
unreinforced membranes or breaking strength for reinforced
membranes when tested as herein required.

International Building Code 1504.7

Impact resistance. Roof coverings installed on
low-slope roofs (roof slope < 2:12) in accordance with Section
1507 shall resist impact damage based on the results of tests
conducted in accordance with ASTM D 3746, ASTM D 4272,
CGSB 37-GP-52M or the “Resistance to Foot Traffic Test” in
Section 5.5 of FM 4470.

International Building Code 1504.8

Gravel and stone. Gravel or stone shall not be used on
the roof of a building located in a hurricane-prone region as
defined in Section 1609.2, or on any other building with a mean
roof height exceeding that permitted by Table 1504.8 based on
the exposure category and basic wind speed at the building site.