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CertainTeed Vinyl Siding Installation Guide
114
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Hanging the starter course
To end up with a single “round” centered at the peak of the gable,
you must properly locate the first starter panel.
Begin by marking a vertical plumb line from the peak.
Then measure and mark the finished height line. In our example,
using a starter course with a 5-1/2" visible height, the finished
height is 9-3/8".
With your ruler inserted into the pocket of the lower J-channel,
mark a line on the substrate equal to the finished height (remember
to allow 1/4" for expansion). Repeat at several points along the
gable base. Use these marks to strike a horizontal level line that will
guide the nailing of the starter course.
The point where the plumb line and the horizontal level line
intersect marks the starting point for hanging the first starter
course panel (if the first starter panel intersects the plumb line).
Determine whether you will center a “scallop” or a “V” at the
starting point. This decision is based on the number of courses
required to complete the gable.
The rule of thumb is:
Center an upper scallop if the initial calculations had less than 0.5
courses remaining (0.44 in our example).
Center the gap or “V” of the upper course if more than 0.5 courses
remained. (In our example we require 5.44 courses, so we would
center on a scallop.)
More than one panel will probably be required to reach the plumb
line. Measure from the plumb line into the pocket receiving channel
(leaving 1/4" for expansion) as illustrated at left.
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5-1/2"
9-3/8"
plumb
line
finished
height line
gap on “v”
remainder of
“scallop”
plumb
line
9-3/8"