Step 1. Weatherboards.
Calculate the height x length of each
wall to give the area in square metres, then
add the total area of each wall together.
Note: Round up wall heights to the
nearest whole number of 200 mm courses of
weatherboards. For example:
If wall height is 2.450 metres (this
allows 50 mm minimum overlap below the
bottom plate), round up the wall height to
13 courses high x 0.20 metres per course =
2.6 metres. Then, subtract the total area
(in square metres) of windows and doors.
Divide this figure by 1.32 to give the
number of 6.6 metre weatherboards required.
Add a minimum 5-10 per cent wastage
allowance.
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Step 2. Starting options.
Option A:
Starting mould (to be used where there is
240 mm above window head, and top of
weatherboard has not been cut off).
Option B:
Utility mould (where weatherboard has
been cut longitudinally through its
twin-wall section, or diagonally for gable
ends).
Calculate the soffit perimeter length of
each wall (in metres) and add together
figures for walls requiring each option.
Divide each figure (metres) by 3.6 to give
the number of lengths of each option
required.
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Step 3. Two-part jointer.
Calculate the total height of all joins
(in metres). Divide by 2.7 to calculate the
number of jointer bases and jointer tops
required.
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Step 4. Corner options.
Option A.
Boxed 90° external corner: Calculate the
number of 2.7-metre lengths of external
corner bases and tops required for corners
requiring this option. For corners higher
than 2.7 metres, a combination of the two
lengths should be selected.
Option B.
Boxed 135/45° corner (suitable for
internal or external 135° corners):
Calculate the number of 2.7-metre lengths
required for corners requiring this option.
For corners higher than 2.7 metres, two or
more lengths will be required.
Option C.
Internal 90° corners: Calculate the total
height (in metres) of all internal corners =
'x'. Divide 'x' by 2.4 to calculate the
number of lengths of metal internal corner
base flashing required. Then divide 'x' by
3.6 to calculate the number of lengths of
utility mould required for internal corners.
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Step 5. Window side detail.
Calculate the total height of windows and
doors (in metres) and multiply by 2. Divide
this figure by 2.4 to calculate the number
of lengths of metal window/door back
flashing required.
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Step 6. Metal base flashing.
Calculate the base length of each wall
(in metres) and add these figures together
remembering to subtract the total width of
door openings. Divide this figure (metres)
by 2.4 to give the number of lengths
required.
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How to
install Supaclad weatherboards
The following steps provide a quick
summary for installing Supaclad. For
detailed Supaclad installation information,
please contact Dynex before starting work.
WARNING: Synthetic building papers must
not be used with Supaclad as they are
unsuitable for use with non-absorbent
claddings such as steel, aluminium and PVC.
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Step 1. Install extruded accessory
bases.
Fix accessory bases in place BEFORE
fixing weatherboards and fitting joinery.
Nail with 30 x 2.8mm galvanised clouts with
9 mm head at 300 mm centres.
Fit starter or utility mould hard up to
soffit lining.
Starter mould is used where there is 240
mm above window head, and the top of the
weatherboard has not been cut off.
Utility Mould is used where weatherboard
has been cut longitudinally through its
twin-wall section, or diagonally for gable
ends.
Next fit all extruded corner bases, jointer
bases (on stud) and metal back flashings to
windows and internal corners.
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Step 2. Install weatherboards.
Cut boards using standard tools (fine
tooth saw or carborundum blade). Allow 3 mm
for expansion at each end of a 6.6 metre
weatherboard. Nail in weatherboards in the
centre of each nailing slot to each stud
(maximum 600 mm centres). Fit weatherboards
from top to bottom checking they are level
at all times and are not creeping. The
centre of each weatherboard can be nailed
through the PVC flap, as opposed to a
nailing slot, to locate the board and
prevent creeping.
The bottom of metal window/door back
flashings, installed prior to cladding, must
be diverted into a slot cut in the back of
the weatherboard immediately between the
bottom window line.
At internal corners, fix Supaclad
weatherboard for one wall directly over
metal internal corner base flashings
installed prior to cladding. Next fit
utility mould on the other wall butting up
to weatherboard on first wall. Then fit
Supaclad into utility mould for second wall.
To attach the bottom weatherboard, a
metal base flashing is attached to the
bottom plate. The bottom weatherboard is
slotted longitudinally along the back and
slid into position. The bottom weatherboard
must overlap the bottom plate by a minimum
50 mm.
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