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CertainTeed Vinyl Siding Installation Guide
77
Fitting at gable ends
Make a pattern duplicating the gable slope. Use this pattern to
guide the cutting of panels to fit gable ends.
To make pattern:
Lock a short piece of siding into the panel gable starter course as
shown in the illustration.
Hold a second piece of siding against the J-channel at the slope.
Run a pencil along edge of this piece, transferring the slope angle
to the first piece of siding.
Cut along the line using a power saw or tin snips. Use the resulting
pattern to mark siding panels before cutting.
NOTE: Double-check the angle on the pattern at every course.
If necessary, cut a new pattern.
To install cut panels:
Slip the angled end of the panel into J-channel along the gable
edge. Leave space for expansion.
Interlock with the siding panel below.
If necessary to securely fasten the last panel at the gable peak,
face nail as shown in illustration. This is the only place you will face
nail. Use a 1-1/4" to 1-1/2" aluminum nail with painted head.
NOTE: Do not cover louvers in gables.
Fitting under soffit
When you reach the last course of siding, you will probably have
to rip cut panels lengthwise to fit under soffit.
NOTE: If necessary to ensure proper panel slope angle,
make certain to furr out this area.
To cut and install this last course:
Install J-channel and undersill trim or dual undersill trim.
Measure from the soffit to the base of upper lock on the previous
course of panels. Subtract 1/4". Mark this dimension on the panel
to be cut, taking the measurement from the bottom edge of panel.
For a more precise cut, repeat this procedure at several other
points along the span to be covered by the panel.
Using a square or straightedge, draw a pencil line connecting
these points. Then score along the line with a utility knife. Bend
the panel back and forth until it snaps. Use a snap lock punch to
create tabs on the outside face of the panel, 1/4" below the cut
edge. Space tabs every 6".
colored
aluminum
finish nail
distance minus 1/4"