the shingles as a spacer to create the straight line desired. Overlap the J-channel (lapping the upper piece over the lower piece) if it is -necessary to use more than one piece. Extend the J-channel past the edge of the roof, channeling water into the gutter, in order to ensure proper runoff. With dark shingles, or a south or west exposure, it is recommended to either use a metal J-channel or to install the vinyl J-channel as far away from the roofing as is aesthetically acceptable, having first ensured that there is sufficient flashing behind the J-channel to prevent water infiltration. Fasten the nail, screw, or staple that is closest to the roof line at the far end of the nail hem slot, to ensure that siding will expand away from the J-channel. Note: Vinyl J-channels should not be in direct contact with roofing shingles, since the shingles may transfer enough heat to the vinyl J-channel to cause its distortion. J-Channel Installation in a Gable Before applying siding to the gables, the J-channel should be installed to receive the siding at the gable ends: Installation Steps Where the left and right sections meet at the gable peak, let one of the sections butt into the peak with the other section overlapping. A miter cut should be made on the face flange of this piece for better appearance. Fasten the J-channel every 8" to 12". If more than one length of J-channel is required to span a wall surface, be sure