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CertainTeed Vinyl Siding Installation Guide
38
Outside Cornerposts
Flash the corners of the home by bending a 20"-wide piece of
aluminum trim coil 90° so you have two 10" legs. Cover the entire
length of the corner, lapping the upper pieces over the lower
pieces. (Self-adhering flashing may be substituted for trim coil.
Follow the manufacturer’s installation instructions and observe local
building code requirements.)
For cornerposts 12' long or less
Position the outside cornerpost so that the top of the post is
1/4" from the underside of the eave. Extend the bottom of the
cornerpost 3/4" below the starter strip.
Before nailing, make sure the post is straight and true. Hang the
cornerpost by first positioning a nail at the top of the topmost
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 cornerpost to allow the cornerpost to move during
normal expansion and contraction. (DO NOT NAIL TIGHT.) Follow
this nailing pattern on both nail flanges of each post.
NOTE: CedarBoards corners install similar to standard
outside cornerposts.
For cornerposts longer than 12' long
Position the outside cornerpost so that the top of the post is
3/8" from the underside of the eave. Extend the bottom of the
cornerpost 3/4" below the starter strip.
Before nailing, make sure the post is straight and true. Hang the
cornerpost by first positioning a nail at the top of the two top nail
slots 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 cornerpost to allow the cornerpost to move during
normal expansion and contraction. (DO NOT NAIL TIGHT.) Follow
this nailing pattern on both nail flanges of each post.
NOTE: When installing any hanging cornerpost longer than
12', position the fasteners at the top of the top two nail
slots on each side of the corner.
Transitioning from masonry to stucco
Position the bottom of the cornerpost 3/4" below the starter strip.
If the corner is less than 12', leave 3/8" from masonry/flashing to
allow for expansion. If the corner is greater than 12', leave 5/8"
from masonry/flashing for expansion.
Top of topmost
nail, center
remaining nails
flashing
nail every 8" to 10"
Top of two top
nail slots, center
remaining nails
flashing
3/4"
3/8"
1/4"
3/4"