Installation Instructions

CertainTeed Vinyl Siding Installation Guide

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"