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Inside Cornerposts
There are three options for trimming inside corners: Standard
3/4" inside cornerpost, single J-channel, and two J-channels.
To flash the inside corner, bend a 12"-wide piece of aluminum
coil stock 90° so you have two 6" legs. Insert the flashing into
the corner. If you use more than one piece of flashing, overlap
the upper pieces of the flashing over the lower pieces.
To install inside cornerpost, hang the post from the top of the
eave. The bottom should extend 3/4" below the starter strip.
Remove the bottom 3/4" of the nailing flange so it does not
show below the siding. Set the post straight and true. Position
the top nail in the top of the nailing slot. All other nails should
be in the center of the nail slots.
If you have to splice the inside cornerpost, cut 1" off all but
the outer face of the lower post. Lap 3/4" of the upper post
over the lower post, leaving 1/4" for expansion.
If you are using two pieces of J-channel instead of inside
cornerpost, flash the corner with a 6" x 6" “L” corner
fabricated from aluminum coil stock. Hang the J-channel from
the top of the eave. The bottom should extend 3/4" below the
starter strip. Remove the bottom 3/4" of the nailing flange so
that it will not show below the siding. Use the same
positioning and nailing guidelines as inside cornerpost.
To create a narrower corner, you can also use a single length
of J-channel and flashing. First, install the siding on one wall,
then place the J-channel lightly against the siding and nail it to
the substrate on the adjacent wall. Follow the same
positioning and nailing guidelines as inside cornerposts.
NOTE: When using a single J-channel, the corner must
have corner flashing
solid nailable
substrate
1/4" to 3/8"
flashing
8" to 10"
3/4"
hang from
top nail, center
remaining nails
inside
cornerpost
splice
corner flashing
(scrap aluminum
coil, for example)
standard 3/4"
inside corner post
single J-channel two J-channels
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Wolverine Fit and Finish Installation Guide