CREATING HOMES WITH CHARACTER
Hardiplank® Siding is a nominally 8 mm thick plank intended as a
horizontal exterior cladding for residential and light commercial
Harditrim® Siding is a nominally 25 mm thick plank intended as a nailable
decorative siding for residential and light commercial buildings.
The plank and trim are fixed to timber battens over a timber frame or
masonry walls using corrosion-resistant nails or screws.
2. SCOPE OF USE
This product is intended for use in residential and light commercial
The plank and trim are made from Portland cement, ground sand, cellulose,
and selected additives. They contain no asbestos, formaldehyde, gypsum or
||90 mm, 140 mm, 185 mm
3.3 Production controls
The Hardiplank® Siding product has been evaluated in accordance with the
protocols and acceptance criteria of ISO 8336:1993 (E) and was found to be
compliant, per evaluation report no. 3035670 (December, 31, 2002).
3.4 Associated products.
For screw fixing use a screw with a shank minimum 4.6 mm diameter x
minimum 32 mm long with a minimum 9.5 mm head diameter with countersinking
ribs formed on the underside of the head to facilitate the embedment of
the screw in the face of the siding. The screw should have adequate
provision for corrosion resistance, refer to Section C.6.4 of BS
4072:1999, Copper/ Chromium/Arsenic preparations for wood preservation.
A hot dipped, galvanised clout head, plain shank nail minimum 40 mm long,
minimum 3 mm shank diameter and minimum 9.5 mm head diameter manufactured
to the requirements of BS 10230-1:2000 can be used to fix the Hardiplank®
siding to the treated timber wall battens if the battens are expected to
be only occasionally damp.
If the treated timber is likely to become wet and a long service life is
required, fixings of austenitic stainless steel should be used in
preference to other fixings.
Ref: Section C.6.4 of BS 4072:1999, Copper/Chromium/Arsenic preparations
for wood preservation
3.4.3 Timber wall battens
Timber wall battens are fixed in the vertical orientation to the outer
face of the structural wall at 400 mm or 600 mm centres. The timber grade
and treatment type needs to be consistent with the engineering requirement
for exterior timber as required by the local building regulations. The
timber thickness should not be less than 25 mm thick. When fixing over a
masonry wall a thicker batten is required to accommodate the 40 mm minimum
length of the siding fixing nail.
3.4.4 Building paper
The building paper shall comply with the requirements for a Type 1
flexible building membranes (breather type) as described in BS 4016: 1997.
Where sealant is required for joint, use a sealant selected in accordance
with the recommendations with BS 6213:2000, Selection of Construction
Sealants guide, and apply as per manufacturer’s instructions.
4. WALL CONSTRUCTION
The structural wall to which the HardiplankĆ Siding and HarditrimĆ
Siding is to be fixed, must be of sufficient strength and stiffness to
satisfy the requirements of the local building regulations in its own
right under the design dead, live and wind loads. The wall may be of
masonry or framed construction.
4.2 Building paper
Fix a building paper, as described in section 3.4.4, to the outer face of
the structural wall, laid along the wall, with an overlap between the
layers of building paper of at least 150 mm. Ensure the building paper is
lapped to drain any water to the outside of the building.
4.3 Timber wall battens
Fit the timber battens onto the exterior of the wall surface over the
building paper. The battens are fitted vertically at 400 mm or 600 mm
centres aligning with the structural wall studs. Ensure that the ground
clearance required by the local building regulations is maintained.
4.4 Fixing the wall battens to the structure
The battens must be securely fixed to the structural wall as they transfer
the wind load applied to the Hardiplank® Siding to the structure. Ensure
that the batten selection and fixing meets the local building regulation
requirements and the wind load requirements of BS 6399: Part 2, 1997.
5. FITTING THE PLANKS
5.1 Starter strip
Cut a 25 mm wide x 8 mm thick strip from a length of Hardiplank®
Siding, see figure 1. Nail this along the front face of the
battens so the the lower edge of the starter strip lies along the
line made by the bottom of the vertical battens. This provides the
lap spacing for the first row of plank. The omission of this strip
will result in “kick-out” on the wall appearing inconsistent
in the second, third and fourth courses.
5.2 First row of Hardiplank® Siding
Mark a line 170 mm up from the lower edge of the starter strip,
see figure 1. Ensure that this line is level. This will be the top
of the first row of Hardiplank® Siding. This spacing gives a 10
mm drip edge at the lower edge of the siding.
Fix the siding to the vertical timber battens using the fixings
described in sections 3.4.1 and 3.4.2. Fix the siding to every
vertical batten with one nail or screw. The centre line of the
nail or screw should be 20 mm below the top edge of the siding.
Refer figure 2. When fixing the ends of the siding ensure the
fixing is placed between 9 mm and 12 mm from the end.
5.3 Second and subsequent rows of plank
The second row of plank is placed so that the lower edge of
the second plank overlaps the top of the first plank by 30 mm, see
figure 2, 3 and 4. It is important to carefully maintain this
dimension throughout the construction of the wall. Fix the plank
using the same type of fasteners and method as the first plank.
|Stagger the butt joints between pieces of siding in
an area of wall over two or more batten lines, i.e. avoid joints
located directly in the same vertical line. Refer to figure 5.
5.4 Plank joints
Cut the siding plank neatly so that it finishes at the centre line of the
timber batten. The siding planks are butted in moderate contact to form
the joint. Optionally install the planks with a 3 mm gap between the ends
of the siding planks and fill the gap with a sealant complying with BS
6213. See section 3.4.5. Fix the siding into position taking care to
maintain the 30 mm overlap dimension between each row of siding planks.
James Hardie believes it is good building practice to seal the joints
around windows, doors and trim edges to prevent moisture, such as wind
driven rain and snow, from penetrating the wall cavity.
5.5 Plank joints.
Where planks need to be cut to achieve the installation requirements, it
is recommended that a score and snap knife be used. The procedure when
using this tool is;
||Mark the line to be cut on the face of the plank
||Place a straight edge along the line to guide the
score and snap knife
||Score along the line until a groove of 3-4 mm is
made in the face of the sheet. This may take 2 or 3 firm passes of
||Break the plank by holding one piece firmly and make
the break by snapping the other piece with an upward motion.
Another option is to cut using a circular saw fitted with a HARDIBLADE™
5.5.2 Harditrim® Siding
Where Harditrim® Siding needs to be cut use a circular saw fitted with a
HARDIBLADE™ saw blade.
The wall battens should be fitted so that they overlap at the
corner forming a solid corner to which to fix the Hardiplank®
Siding and Harditrim® Siding.
The corner construction is completed using Harditrim® Siding see
figures 6 & 7. The corners can be formed in two ways depending
on the style desired;
(i) The Hardiplank® can be run right to the corner and have the
Harditrim® Siding placed over the Hardiplank® Siding, or
|(ii) The Harditrim® Siding can be
fixed to the corner battens directly and the Hardiplank® Siding
butted up to the edge of the Harditrim® Siding.
Allow approx. 3 mm between the end of the Hardiplank® Siding and
Harditrim® Siding for the application of sealant.
The Harditrim® Siding can be butt joined or mitre cut at the
corner. NOT HERE
Hardiplank® Siding and Harditrim® Siding can be field finished. For
field finishing paint in accordance with the paint manufacturers written
application instructions. Hardiplank® Siding and Harditrim® Siding may
be available prefinished.
7. WALL PENETRATIONS
When a penetration in the wall is required, for a pipe or tap for example,
form a hole in the plank using a hole saw. Make the hole approx. 8 mm
larger than the diameter of the pipe. Seal between the fitting and the
edge of the hole with an exterior quality sealant. If the space between
the fitting and the hole is too wide, use a polyethylene foam backing rod
to fill the major part of the gap. The remaining gap should be filled with
8. LOAD BEARING
Hardiplank® Siding and Harditrim® Siding are not intended as a load
bearing or shear elements in the wall construction. Items required to be
attached to the wall should be supported directly by connections to the
structural sheathing and/or framing members, not attached to the siding or
trim as the primary load bearing elements.
9. HANDLING AND STORAGE
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Van Beck Roofing and Siding Co. Copyright © 2003
October 09, 2006