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If a wall requires more than one course of siding, you can
proceed in one of three ways:
Use two lengths of J-channel, back-to-back, at the joint
between the two courses (illlustration a).
Use a combination of one length of J-channel and one length
of drip cap (illustration b).
Use a double channel lineal and flashing where required.
If using J-channel
Snap a chalk line parallel to the bottom J-channel, at a height
equal to the length of the lower panel plus an allowance for
expansion. For example, if the lower panel is 144" long and
you’re adding 1/2" for expansion (because the temperature is
above 40° F), you strike a line 144-1/2" from the bottom
J-channel. Nail inverted J-channels along this line to receive
panels from below. Leave a 1/4" gap between J-channel and
cornerposts. Overlap J-channels 3/4".
Prepare for the second course by applying head flashing
above the just-installed J-channel. Then nail J-channel over
the flashing to receive the upper panel.
NOTE: Some installers prefer to use formed aluminum
flashing in place of vinyl drip cap as the receiving channel
for the lower panel. This is also an acceptable approach.
Installing J-channel at Gable Ends
Follow the procedure described earlier under the section
“Preparation for Horizontal Siding” beginning on page 21.
If using double channel lineal: Measure the length of the
lower panel, then add an allowance for expansion. Snap a
chalk line parallel to the bottom J-channel, at a height equal to
your measurement. Position the lineal so the interior peak of
the lower channel runs along the chalk line. Nail. Leave a 1/4"
gap between lineal and cornerposts.
Where required, overlap lineals 1". Whenever lineals are
overlapped, you must insert flashing into the upper channel,
or provide additional means of flashing. Nail in place.
vertical
siding
J-channel
flashing
J-channel
vertical
siding
double
channel
lineal
aluminum flashing
(required if lineals
are overlapped) or
provide additional
means of flashing
chalk
line
vertical
siding
J-channel
drip cap
vertical
siding
ab
67
Wolverine Fit and Finish Installation Guide