Vinyl siding is not airtight, so adding J Channel would do nothing to stop that air you feel. The air you feel is unrelated to the use (or lack thereof) of any J Channel. If your window opening is not sealed before the vinyl is up, it's too late to seal it and you will need to take the vinyl siding off and take the window out and seal the opening. That process occurs before siding is ever put up. Remove the siding near the J-channel for a secure fit and then. Cut the punctured edge of your J-channel to set it in place around windows, doors, edges or walls and secure the trim with nails or screws. However, you only have two options once your siding is in place. We would need to see a close-up of the sides to know more.Īs far as leaks go, you seal a window against air and water before it is sided. The process for installing J-channel under existing vinyl siding is simple. Flashing: Use aluminum trim coil or other material which will not absorb water. but it depends on how they frame, caulk, and side around the top side of the openings. Remove any old caulking around windows and doors. The one place it might be needed is above a window or door, where it can act as a way to catch and divert water from getting behind the siding somehow. the J Channel acts as a trim (which, by definition in construction/building, is just finishing/aesthetic additions, not necessarily functional, though some trim can be functional, too) that the ends of your vinyl siding slide into, hidden from sight. For the sides of the window, at least, "J channel" trim is just for looks it's so the crew doing the siding, who are likely working very quickly, don't have to be particularly precise in their cuts.
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