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Installing the Accessories

Chalk Line
It is best to establish a chalk line in relation to the the eaves of the house, or along the top and bottom of the windows, after determining the lowest corner of the house. Typically, the chalkline is positioned 1" higher than the lowest corner. Be sure to consult the manufacturers instructions for specifics. Snap a chalkline at the required height around the base of the house.

In cases where a lower portion of a horizontal siding panel must be trimmed to fit over steps, porches, and the like, the panel should be furred for proper angle and rigidity. Under sill trim can be used to seal the cut edge of the panel, and the secured to the wall.

Horizontal Starter Strip
Using your chalk line or cord as a guide, install the starter strip along the bottom of the building. Always remember to nail in the center of the nailing slots, and align the siding with windows and eaves. If you are using insulation or backerboard it may be necessary to shim to accommodate varying thickness.

Allow enough space for corner posts, J-channels, etc. Keep the ends of the starter strips at least 1/4" apart to allow for expansion.

Outside Corner Post
Place the Outside corner post in position, allowing 1/4&quit; at the top of the wall. Position the nail by nailing at the top of the upper slot. All remaining nailing should be done in the center of the nailing slots, 8" to 12" apart. This allows for the expansion and contraction to occur at the bottom. When installed, a 1/4" space should be maintained in the channel section of the corner post.

Inside Corner Post
Installing the inside corner post is the same as the outside corner post. Exercise the same care. Both types of corner post, as well as the starter strip, is installed before the siding panels are applied. Having these items plumb is Very Important! Make certain that all corner posts are installed square.

Windows and Doors
Trim
J-channel is used around windows and doors to receive the siding. Bend the tabs down to provide flashing over side members. Fold the bottom end of the side piece of J-channel inward at the bottom of the window, to fit over the existing J-channel to prevent water from entering under the sill.

Side J-channel members are cut longer than the height of the window or door, and notched at the top as shown. Mitre cut the free flange at a 45° angle and bend the tab down to provide flashing over side members. A similar mitre and tab may be provided at the bottom of the window depending on the condition of the sill. It is recommended that you caulk around all windows and doors before installing the trim pieces.

Flashing
To F\further prevent water from getting behind the siding, a flashing piece should be cut from coil stock and slipped under the base of the side J-channel members and positioned so as to lap over the top nailing hem of the panel below (see illustration). Caulk around windows and doors as required.

Gable and Trim
Before installing the siding panels, J-Channel should be installed to receive the siding at the gable ends. Where the left and right sections meet at the gable peak, allow one of the sections to butt into the peak with the other section overlapping. Make a mitre cut on the face flange of this piece for better appearance. All old paint buildup should be removed before you install the J-channels. Fasten the J-channels every 6" to 12".

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