Installing Vinyl Siding Around Windows With Integrated J Channel

For the window first position the j channel against the window casing.

Installing vinyl siding around windows with integrated j channel.

Mark cut and notch the top. Cut and position an undersill trim if necessary see when to use undersill trim. Drive roofing nails every 8 to 10 in. I only use plywood.

Caulk behind the vinyl nailing flange of the window first then install grace strips over the flange and then you can run your siding right into the window j channel. No pieces to separate. Windows and doors install the j channel vinyl siding around all four sides of a window or three sides of a door. Don t drive them tight.

Another option is crane board makes an adapter that snaps onto the windows built in j channel that turns it into a 1 1 4 deep j pocket for use with their insulated siding. Integral j is fine its actually better. The intergral j is a real bad idea. It does not drain water off the top of the window but to both sides where some it will end up behind the siding when leaving the bottom of the side j s it s a built in fault with regular and integral j s and the way 99 of people install vinyl and similar sidings.

The vinyl siding trim pieces should slide back and forth slightly. Some modern vinyl windows however incorporate a j channel right into the. Lats are ok but they tend to split too easily especially if you are nailing the window every other nail slot. Install j channel under the window.

Alternatively i use vinyl window and door casing which is essentially a 2 1 2 in. On the top of the window don t run it to tight leave room for the water to run off. Traditionally j channel was a siding trim molding fastened around windows and doors which then received the siding. Through the middle of the slots.

Continue installing courses of siding along the sides of the window leaving 1 4 inch spaces within the j channel at the end of each piece of the siding for expansion.