Wolverine Siding and Vinyl Carpentry Soffit and Decorative Trim - Manual (Page 77)

Installation over Enclosed Eaves
If the existing soffit is rotted or damaged, it’s best to remove
it completely before installing vinyl soffit. Then use the
instructions for open eaves.
If you’re installing perforated soffit panels and the existing
soffit doesn’t have openings for ventilation, cut an adequate
number of openings. Then complete the installation as
described for open eaves.
The procedure used to install soffit over an enclosed eave is
almost identical to that used for an open eave. The major
difference is the installation of the J-channel. Determine the
method you’ll use to install soffit at the fascia board (see
figures 5 and 6). When installing J-channel at either the wall
or the fascia board, nail the J-channel every 12"-16".
Turning a Corner
If the soffit is to turn a corner, cut and install J-channel so
there is 1/4" for expansion at each of the adjoining walls and
adjoining fascia boards. Miter the corner soffit panels and
install as described above.
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Wolverine Fit and Finish Installation Guide
fascia cap or
coil stock
nailing
strip
J-channel
soffit
enclosed
eave
J-channel
soffit
enclosed
eave
FIGURE 6
FIGURE 5