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CertainTeed Vinyl Siding Installation Guide
43
Trimming Bay Window Corners
There are several ways to trim the odd angles of bay windows.
Here are two of them:
1. Install bay window cornerpost.
2. Install J-channel with a quarter-round insert.
Before you begin, make sure the corner is properly flashed.
Install bay window cornerpost
• Cut bay window cornerpost to the proper length.
• For angles less than 45°, push down on the face of the corner
until the nail flanges seat flat against the wall surfaces.
• Hang the cornerpost by nailing loosely into the topmost nail slot.
• Make sure the cornerpost is straight and true.
• Position all remaining nails in the center of nail slots a maximum
of every 8" to 10". Leave 1/8" to 1/16" between the nail head
and the cornerpost to allow the cornerpost to move during
normal expansion and contraction.
• Fit the siding into the cornerpost.
Install J-Channel with quarter-round insert
• Cut two pieces of J-channel and one piece of quarter-round
insert to length.
• Pop rivet the J-channels to each side of the quarter-round insert
in at least three places.
• Nail the assembly to the corner, remembering to hang the
assembly from the topmost full nail slot.
• Position all remaining nails in the center of nail slots a maximum
of every 8" to 10". Leave 1/8" to 1/16" between the nail head
and the J-channel for normal expansion and contraction.
• Fit the siding into the J-channels.
See page 109 for installing bay window corners with
Cedar Impressions Siding.
for angles
less than 45°
for angles 45°
and larger
push down
until nail
flanges
seat flat
pop rivets
remove
half of the
longer leg