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CertainTeed Vinyl Siding Installation Guide
67
Using Lineals as Gable Trim
You can give gable end trim a more dramatic appearance by using
3-1/2" or 5" lineals instead of J-channel.
To install the lineals:
Make a pattern duplicating the gable slope. To create an angle
template, lock a piece of lineal into the previous course of siding or
other gable starter. Hold a second piece of lineal or starter against
the slope and transfer the angle with a pencil.
Transfer the angle of the template to the end of a length of lineal.
Cut away the lineal face and nail flange.
Turn the pattern over and transfer the opposite angle to the
second lineal. Trim the nail flange and receiving channel from the
opposite lineal to this line. Do not cut the lineal face.
Insert the full-faced lineal into the mitered lineal. If the nail flange
or return lips butt and prevent a tight fit, trim off additional material
from the second lineal.
Installing trim at roof line
To prevent water infiltration along the intersection of roof and wall,
install flashing before installing J-channel. At points where vinyl
siding and accessories will meet at a roof line—such as areas
where a gable dormer or a second story side wall intersect with the
roof —it’s best to position the J-channel so it is a minimum of 1/2"
away from the roof line. Placing the J-channel directly on the roof
line will subject it to a build-up of heat, which could result
in excessive expansion.
NOTE: If you use more than one length of J-channel to span a
wall surface, be sure to overlap them 3/4".
90º
90º
starter strip
1/2" (min.)