Extracellular spaces in connective tissues are therefore more abundant and contain vessels. In connective tissues, the extracellular space is termed the extracellular matrix because products of specialized cells accumulate here.
'J' channels are even improperly used on Fiber Cement Siding! Note: The actual examples below are not indicative of every siding job with 'J' Channels. All photos below are from the same area on the same wall of one house. This is the northeast side of a home located about 2 blocks from the NJ shore.
Starting with the bottom, cut a piece of J channel about 2 inches longer on each side of the window. Malco MV12 USA Made Multiple Purpose Snip Vinyl Siding, Aluminum Trim Coil, Vinyl Flooring, Carpeting, Leather and Landscaping Edging. Mark the corners of the window.