certain that the vinyl panels can move freely in a side-to-side direction once fastened. When panels overlap, make sure they overlap by one half the length of the notch at the end of the panel, or approximately 1". The foam insert in the back of the panels should but together. Always overlap joints away from entrances and away from the point of greatest traffic. This will improve the overall appearance of the installation. Vinyl siding panel seams should be staggered along the installation and should be at least three courses apart. Installing Under Window and Crown Area Several options are available to secure the topmost panel below the eaves or windows. Depending on where the siding panel has to be cut, you have to follow one of the methods below: If the Adirondack panel is cut in a thick section of the panel; Cut the siding panel and punch snap locks every 6" to 8". Push the panel securely into the top J-channel. If the Adirondack panel is cut above or below the thickest section of the panel; Place a smaller 5/8" J-channel inside the 1 1/4" J-channel to act as an undersill trim. Cut the siding panel to the appropriate dimension and punch snap locks every 6" to 8". Push the panel securely into the 5/8" J-channel. If the Adirondack panel is cut above the foam section of the panel; Install an undersill trim in the top J-Channel. Cut the siding panel to the right dimension and punch snap