Our frame profiles have been engineered to conveniently allow for a variety of snap-in J-channel accessories, without the hassle of installing a J-channel on site. Our snap-in J-channel accessories can expand the J-channel pocket to 3/4″ or 1-1/4″ on patio doors and 1-1/4″ on windows, to accept a wider array of exterior cladding. We also offer a J-channel pocket filler that closes off the pocket—ideal for fiber cement or masonry applications. Our innovative J-channel is just one of many reasons why customers choose Viwinco!