Technical Specifications

ESR-1668
|
Most Widely Accepted and Trusted Page 2 of 9
horizontal edges, and must be no closer than
3
/
8
inch
(9.5 mm) from the panel vertical edges. Fasteners must be
corrosion-resistant and sized as specified in Table 2 of this
report. Installation must comply with this report and the
manufacturer’s published application instructions.
Where nonstructural or nonfastener base structural
sheathing is used under the siding, fastener length must be
increased to provide a minimum 1
1
/
4
-inch (31.8 mm)
penetration into the framing. Blind fastening is acceptable
on lap siding installed according to the assemblies noted in
Table 2 and Figure 2 of this report.
The installation of the Allura™ fiber cement sidings must
be in accordance with the limitations described in Section
1405.16 of the 2012 and 2009 IBC or Section 1405.15 of
the 2006 IBC, as applicable, for all construction types.
4.2 Lap Siding:
Lap siding must be applied horizontally, commencing from
the bottom of a wall, and with a minimum 1
1
/
4
-inch-wide
(31.8 mm) overlap at the top of each board. Vertical joints
between planks must be over studs and must be staggered
on subsequent courses. If no wood stud or steel framing is
available at the vertical joints, the siding vertical edges
must be fastened to
7
/
16
-inch structural sheathing. These
vertical joints between planks must be lightly butted and
must be covered with an H-section joint cover or located
over a strip of flashing. Horizontal joints must be flashed
with Z-flashing and blocked with solid wood framing. A
1
/
8
-inch (3.2 mm) gap must be left at locations where the
siding butts against door and window trim and at corners;
such gaps must be flashed in accordance with the
applicable code, then caulked. Trim and corners must be
installed and the siding must be finished in accordance
with the manufacturer’s application instructions. A clear
distance of 6 inches (152 mm) must be maintained
between the siding and the ground.
4.3 Vertical Panel Siding:
The vertical panel siding may be applied with the long
dimension of the panel parallel or perpendicular to the
framing. All panel edges must be backed by nominally
2-inch or thicker wood or minimum No. 20 gage [0.036 inch
(0.91 mm)], 3.625-inch-by-1.375-inch (92 by 34.9 mm),
33 ksi steel C-stud framing members. Vertical joints must
be lightly butted, must occur over framing members, and
must be sealed with caulking or covered with battens.
Horizontal joints must be weatherproofed by leaving a
3
/
8
-inch (9.5 mm) gap, which must be flashed with
corrosion-resistant metal “Z” flashing and caulked. Where
siding butts against door and window trim, and at corners,
a
1
/
8
-inch (3.2 mm) gap must be left and flashed in
accordance with the applicable code and caulked. Trim
and corners must be installed and the siding must be
finished in accordance with the manufacturer’s published
application instructions. A clear distance of 6 inches
(152 mm) must be maintained between the siding and the
ground.
4.4 Soffit Panels:
The soffit panels must be attached to framing spaced a
maximum of 24 inches (610 mm) on center, with the long
dimension of the panel perpendicular to framing. Fasteners
and fastener spacing must be as described for vertical
siding in Section 4.3 and Table 2. Fasteners must be
stainless steel or hot-dipped galvanized, and fastener
spacing must not exceed 6 inches (152 mm) on center.
4.5 Shapes Panels:
Shapes siding shall be installed in accordance with the
manufacturer’s published application instructions.
4.6 Transverse Wind Pressures:
Allura™ fiber cement sidings must be attached to wall
framing so that the allowable transverse wind load
pressure (based on the siding size, framing spacing, and
fastening schedule) noted in Table 2 exceeds the design
wind pressures determined in accordance with the
applicable code.
4.7 One-hour Fire-resistance-rated Assembly:
The lap and vertical panel siding products noted in
Table 1 are recognized as components of one-hour,
fire-resistance-rated, limited-load-bearing, wood-stud wall
assemblies when constructed in accordance with Figure 1
of this report. Wall design is limited to the allowable stress
design approach, using the edition of the National Design
Specification for Wood Construction (NDS) specified in
the applicable code. The allowable axial load for a wall
assembly constructed with lap siding must be determined
in accordance with the applicable code.
5.0 CONDITIONS OF USE
T
he Plycem USA Allura
™
fiber cement products described
in this report comply with, or are suitable alternatives to
what is specified in, those codes listed in Section 1.0 of
this report, subject to the following conditions:
5.1 The products must be installed in accordance with
this report and the manufacturer’s instructions. In the
event of a conflict, the instructions in this report must
govern.
5.2 The products must be subject to the limitations
described in Section 4.1 for all construction types.
5.3 Under the 2012 IBC, Section 1403.5, installation
on exterior walls, on buildings of Type I, II, III, and
IV construction incorporating a combustible
water-resistive barrier, is limited to buildings that are
not greater than 40 feet in height above grade plane.
5.4 The products have not been evaluated for in-plane
racking resistance. Walls must be braced by other
means as required by the applicable code.
5.5 The products are manufactured in Roaring River,
North Carolina, and White City, Oregon, under a
quality control program with inspections by ICC-ES.
6.0 EVIDENCE SUBMITTED
6.1 Data in accordance with the ICC-ES Acceptance
Criteria for Fiber Cement Panels Used as Exterior
Wall Siding (AC90), dated June 2012 (editorially
revised November 2013).
6.2 Reports of testing in accordance with ASTM E119,
ASTM E136 and ASTM E84.
7.0 IDENTIFICATION
The lap siding, vertical panel siding, soffit panels, and
shapes siding must bear a label noting the product name;
the manufacturer’s name; the manufacturing plant location;
and the evaluation report number (ESR-1668).