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+11 How To Connect J Channel Together 2022 . In some instances it is not necessary to use a trim or support at the fascia end as the fascia will support that end of the soffit material. Measure the length of the first piece by measuring inside the j channel from one side of the ceiling to the other. Unistrut Channel Connecting Fittings manufacturersupplier China from www.smartclima.com Cut pieces to length as needed with tin snips. Hold a chalk line along the soffit panel, intersecting the two measurement marks, and snap it. Place the f channel pieces across from each other, with the right amount of space between them for the panels of the soffit to slide between them and fit securely.