Installation Guide

Figure 1 12 Swept or Bell Eave1: Apex Roof Juncture Figure
For excessive sweep
shingles may be
steam bent
Last course
over flashing
Ridge cap
Apex Juncture
Swept or Bell Eave
On this roof juncture (Figure 11) metal
flashing should cover the top 8" of the roof
and the top 4" of the wall. It should be
installed before the final course of Certi-label
shakes or shingles is applied to the wall. The
recommended sequence of application is to
apply Certi-label shakes or shingles first to the
wall then to the roof. The overhanging roof
material is then trimmed flush with the wall.
Finally, specially prepared ridge units are
applied over the wall-roof juncture so that in
each matching pair the roof piece overlaps
the wall piece each time.
When Certi-label shakes or shingles are to be
applied to a swept or bell eave where the
curvature is excessive, it may be necessary to
soak them for a period (usually overnight) or
steam them prior to installation. A double
starter course is employed in the usual
manner. Exposure is determined by the slope
of the roof and the type of Certi-label shake or
shingle selected. At lower pitches waterproof
eave protection should be used.
ROOF JUNCTURE DETAILS
Double eave protection
9
Sheathing
Metal
flashing
Roof Valley Flashing Detail
Most roof leaks can occur where water is
channelled off the roof or where the roof
abuts a vertical wall or chimney. At these
points, metal valleys and flashings are used to
assist the Certi-label shakes and shingles in
keeping the structure sound and dry.
Structural members that join a roof should
also be flashed at all intersecting angles to
prevent leakage. Step flashing should extend
under the Certi-label shakes and shingles, up
the vertical surface, (one flashing installed on
each course concealed under the covering
course) and should be covered by a second
layer of flashing (counter-flashing).
Flashing should be pre-painted both sides
using a good metal or bituminous paint
(Figure 13a). Flashing strips which must be
bent to sharp angles should be painted after
bending. Metal flashing with baked-on enamel
coating is available in some areas.
Different flashing metals are available in
different areas depending on climatic
variations. It is good practice to use metals
that have proven their reliability under the
specific conditions to be encountered. It is
important that metal flashing have the same
longevity as Western Red Cedar. Check with
your local building official for their preference
in your area.
Note: For unusual roof applications contact
the Cedar Shake & Shingle Bureau for a list of
members who can assist you with specific
questions.
Open valley width 4" to 8"
depending on water volume.
Mark anticipated water lines
(width of open valley) on valley
sides with a chalk line.
Use minimum nails to hold
metal in place
Roofing felt
Valley metal 8'0" long
overlapped 6" at joints/
painted both sides
Eave protection
(extend to rake edge)
Metal to extend as far as
shakes or shingles
Figure 13a: Valley Metal
W valley metal
Solid sheathing at eave
Eave felt should be
lapped over the valley
joint to give 3 levels
of eave protection.
(valley felt, eave felt
and metal)
ROOF VALLEY FLAS SHING DETAIL
Valley felt