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CertainTeed Vinyl Siding Installation Guide
90
Turning a corner
To turn a corner, measure from the channel at the wall corner to
the channel at the corner of the fascia board. Subtract 1/4" for
expansion. If necessary, install nailing strips to provide backing
for the lineal. Cut and install soffit double channel lineal or H-bar.
Miter the corner soffit panels and install as described earlier.
Completing the installation
To complete the installation, apply utility trim and fasten aluminum
fascia cap or formed aluminum coil stock with painted trim nails.
If you must face nail fascia, drill holes for the trim nails to allow for
expansion and to reduce denting of the aluminum.
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" to 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 earlier.
fascia cap or
coil stock
soffit J-channel
J-channel
soffit
enclosed
eave
soffit
H-bar
fascia
nailing strip
enclosed
eave
Fig. 5
Fig. 6
miter soffit panels