Craftsman CTS205 manual Half-Round Shingles in Gable Ends, 113, Making the starter course

gable height

5-1/2"

top of gap

5-1/2"

cut remove

CertainTeed Vinyl Siding Installation Guide

Half-Round Shingles in Gable Ends

NOTE: The following instructions focus on a gable installation. They also are geared towards an enclosed gable, started with a J-channel. The Half-Round can also be started with starter strip. This is an example only!

Installing receiving channels

Frame the border area with 3/4" J-channel. Nail in place loosely. Miter joints accordingly.

NOTE: You also can use 3-1/2" or 5" lineals to frame gable ends and gable base. For instructions on cutting lineals for peaks, see “Gable Trim” on page 67.

Cut enough J-channel to span the base of the gable; then secure it in place.

NOTE: The instructions below show how to create a gable installation with a complete, centered Half-Round at the peak.

Making the starter course

Gable installations properly terminate with a single round at the peak. To create this effect, you usually have to adjust the height of the starter course.

To determine the height of the starter course, calculate the number of rows required to complete the gable.

Use the following formula:

Gable height (inches) ÷ 12.5 (face exposure) = courses required

NOTE: Gable height is measured from inside the horizontal receiving channel to the peak (allowing 1/4" at top and bottom for expansion).

For example, with a 68" gable height, the calculations would be 68 ÷ 12.5" = 5 with a remainder of 0.44. This means you would need 5 full courses plus 0.44 x 12.5" (face exposure of panel) = 5.5" measured from the top edge of the gap on the upper course (illustrated). This is the visible height for your starter course.

The visible height is the vertical dimension of the panel you’ll see below the first full row of rounds.

Once you’ve determined the visible height of the starter course, mark this dimension on a Half-Round Shingle panel. Measure from the top of the gap on the upper course (illustrated). Draw a cutting line the entire length of panel.

Cut and use the top section, which contains the locks, as your starter course. Cut enough panels to span the base of the gable.

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