Installation Instructions

CertainTeed Vinyl Siding Installation Guide

Installing J-Channel as Gable End Trim

Install J-channel to receive siding at gable ends, as shown in the

illustration. To create a clean, professional look, follow these steps:

To create an angle template, hold a piece of J-channel against

the slope while transferring the angle to another J-channel with

a pencil.

Next, transfer the angle of the template to the end of a length

of J-channel. Be sure to extend the line onto the nail ﬂange.

Cut away the channel face and the nail ﬂange.

Turn the pattern over and transfer the opposite angle to the

second J-channel, being sure to extend the line onto the nail

ﬂange. Cut away the nail ﬂange and return lip, but do not cut the

J-channel face.

Insert the full-faced J-channel into the mitered J-channel. If the nail

ﬂange or return lips butt and prevent a tight ﬁt, trim off additional

material from the second J-channel.

NOTE: For a more decorative appearance, you also can

use 3-1/2" or 5" lineals to trim gable ends (see next page

for details).

To splice the J-channel, follow these steps:

Cut out a 1" section of the nailing ﬂange and face return as shown.

Install inverted J-channel along the top of the wall, under the

eave. Here again, leave a 1/4" gap between the J-channel

and the cornerposts. Overlap the J-channel 3/4" to allow for

expansion. When positioning the upper J-channel, be sure to

allow for expansion of the siding panel. In most cases, position

the J-channel at a point equal to the length of the panel plus 5/8"

(1/4" for upper expansion and 3/8" for lower expansion).

90º

3/4"