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CertainTeed Vinyl Siding Installation Guide
115
If you require an odd number of courses (i.e. five full courses plus
starting course), subtract 8" from the distance from the plumb line
to the left receiving pocket (remember to allow 1/4" for expansion).
If you require an even number of courses (i.e. 6 full courses plus
starting course), subtract 18-1/2" from the dimension.
NOTE: The 8" and 18-1/2" dimensions ensure having a full
centered scallop at the topmost part of the gable.
For example: If the measurement required to the plumb line (minus
8" for an odd number of full courses) is 152", then 152"÷ 32" = 4
full panels plus 0.75% of one panel or 24" measured from the edge
of the texture on the right side (temperature indicator side).
Create a cutting guide as described earlier for gable applications
and trim the first panel (for this example) at 24". Continue to hang
the remaining starter course strips, remembering to center nail first.
Installing first full panel
It is important to stagger the panels, as described in this section.
The easiest way to determine the length of panel required is to
measure from the alignment line on the nail flange of the starter
panel to the edge of the roof slope (see illustration).
Using this measurement, drill a hole centered in the remaining nail
flange as described earlier. Lock the first full exposure panel to the
starter course after trimming for roof slope.
After locking panel in place, center pin the panel.
Lapping remaining panels
The remaining panels to be installed must be lapped in accordance
with the current temperature.
Repeat this process for the entire course.
At the end of each course, trim panels to the gable angle.
Be sure to allow for expansion at the J-channels.
Installing the last round
When you reach the peak, trim the last round to the desired height
by removing the locks. Then face nail to the substrate, using a
color-matched finishing nail.
plumb
line
152" 8"
24”
cut for roof slope
length of
first panel
line represents the bottom of
the first full course of scallops
length of
first panel
second
alignment
mark
mark