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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. Leave 1/4" for
expansion.
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. Leave 1/4" for
expansion.
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Wolverine Fit and Finish Installation Guide
for angles
less than 45°
pop rivets
remove
half of the
longer leg
nail loosely
every 8"-10"
push down until nail
flanges seat flat
for angles
45° and
larger