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Shingle
Application
Regardless
of style,
the
following
basic
application
details
(Figure 4
below) must
be observed.
1) Shingles
must be
doubled or
tripled at
all eaves.
2) Butts of
first course
shingles
should
project 1½"
beyond the
fascia.
3) Spacing
between
adjacent
shingles
(joints)
should be a
minimum of
¼" and a
maximum of
3/8".
4) Joints in
any one
course
should be
separated
not less
than ½" from
joints in
adjacent
courses; and
in any three
courses, no
two joints
should be in
direct
alignment.
5) In lesser
grade
shingles
containing
both flat
and vertical
grain,
joints
should not
be aligned
with
centerline
of heart.
6) Flat
grain
shingles
wider than
8" should be
split in two
before
nailing.
Knots and
similar
defects
should be
treated as
the edge of
the shingle
and the
joint in the
course above
placed 1½"
from the
edge of the
defect.
Shake
Application
Shakes, like
shingles,
are normally
applied in
straight,
single
courses. The
following
application
details
(Figure 5
below) must
be observed.
1) The
starter
course may
be one or
two layers
of cedar
shingles or
shakes
overlaid
with the
desired
shake. A 15"
shake is
made
expressly
for starter
and finish
courses.
2) Butts of
first course
shakes
should
project 1½"
beyond the
fascia.
3) An 18"
wide strip
of No. 30
roofing felt
(or No. 15
felt
depending
upon code
requirements)
should be
laid over
the top
portion of
the shakes
and extend
on to the
sheathing.
The bottom
edge of the
felt should
be
positioned
above the
butt of the
shake at a
distance
equal to
twice the
weather
exposure.
For example,
24" shakes
laid with
10" exposure
would have
felt applied
20" above
the butt.
Thus the
felt will
cover the
top 4" of
the shakes
and extend
up 14" onto
the
sheathing.
4) Spacing
between
adjacent
shakes
should be a
minimum of
3/8" and a
maximum of
5/8".
5) Joints
between
shakes
should be
offset 1½"
over
adjacent
courses.
6)
Straight-split
shakes
should be
laid with
the froe-end
(the end
from which
the shake
has been
split and
which is
smoother)
towards the
ridge.
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