Installation Guide

Battens
Shingles shall be applied over softwood lumber
battens of 25 x 38mm minimum dimension over
rafter minimum dimension of 75 x 38mm, with
maximum rafter centres of 600mm. Larger battens
of 25 x 50mm are required for 100 x 51mm rafters
with rafter spacing of up to 812mm (Figure 1).
Shakes require minimum batten dimension of
19 x 50mm. Wider battens are recommended for
alpine regions where snow load is a factor. Solid
sheathing is acceptable for use under preservative
or fire treated shingles or shakes. Solid sheathing
is usually wafer-board panels or plywood which
provides a smooth base for roofing (Figure 2).
Shingles
Space sheathing 25 x 38mm minimum battens to
coincide with the weather exposure (Table 2,
page 16) of the shingles. Thus, if the shingles are
to be laid at 140mm to the weather, the battens
would also be spaced at 140mm on centre,
measured from 38mm past the fascia board.
A one metre strip of roofing felt paper may be
installed at the eave edge for additional protection.
Shingles must be doubled or tripled at eaves.
Spacing between adjacent shingles (joints) should
be a minimum of 6mm and maximum of 9mm.
Joints in any one course should be separated not
less than 38mm from joints in adjacent courses:
and in any three courses, no two joints should be
in direct alignment (Figure 3). Extend shingles
over gable moulding 38mm.
Figure 1: Shingles Applied Over
25 x 38mm Minimum Battens
Figure 3: Joint Alignment
For Shingles and Shakes
Fig. 4: Shingle Application
2
Eave
protection
min. 915mm
Solid sheathing
305mm to 610mm
wall line
38mm
M
ultiples of exposures plus 64m
m
Exposure
38mm
Knot or
similar defect
Centerline
of heart
Eave protection min. 915mm
38mm
Solid plywood underlay
Multiples of exposures plus 19m
m
T
w
o exposures
Spaced sheathing should
be 25mm x 38mm minimum
Gable
molding
Eave protection
Rafter
First course
doubled or tripled
Drip edge 38mm
Wood gutter
Fascia
Rafter header
Two nails (only) for each
shingle 19mm to 25mm from edge
and 38mm to 50mm above butt
line of next course
For 1:3 pitch and steeper, use
#1 grade shingles at 125mm
140mm and 190mm exposures
for 405mm, 455mm and 610mm
shingles respectively. For lower
pitches use reduced
exposures
6 mm to 9 mm
Alternate course joints
should not align
Adjacent courses should be
offset 38mm minimum
GENERAL ROOF DESIGN DETAILS
Figure 2: Treated Shingles Applied
Over Solid Sheathing