Cut the J-channel to fit along the top of the gables beneath the rooftop. Use a hacksaw to cut the PVC J-channel to size.
Install the J-channel along the roof gables with corrosion-resistant nails. Drive the nails through the prefabricated nail slots that run along the length of the J-channel. Leave one-thirty-second- to one-sixteenth-inch of the nail shafts exposed to allow for the natural expansion and contraction of the PVC material.
Leave a quarter-inch between adjacent pieces of J-channel.
Cut the vinyl siding panels to the proper length and angle. Use tin snips to cut through the siding panels. Leave a quarter-inch of space between the end of each siding panel and the back of the J-channel to allow for expansion.
Attach the vinyl siding panels to the house frame with corrosion-resistant nails driven through the prefabricated nail slots along each panel’s top edge. Drive the nails directly through the center of each nail slot, and leave one-thirty-second- to one-sixteenth-inch of the nail shafts exposed.
Overlap adjacent siding panels by 4 inches. Work your way up, locking the base of each siding panel course to the top edge of the panel course beneath.