recently i ve spoken to several folks in a nearby neighborhood all with a similar problem their garage doors were framed and then cladded with aluminum replacing aluminum trim around garage door 20180703 124832 1438187220065 jpg installing j channel around windows and doors replacing aluminum trim around garage door 20180703 124817 1438187265537 jpg image of vinyl siding trim around garage door garage door and light box trim finish how to fix rotting wood in the top of garage door opening i fit and mered a couple of small pieces of trim and drew lines for the j channel here is one corner of a garage door with mitered j channel nailed up garage door trim how 6 this is showing where the right piece connects 7 here s a wide shot of the inside of the garage with the door closed the damaged area is highlighted 6 this is showing where the right piece connects 7 here s a wide shot of the inside of the garage with the door closed the damaged area is highlighted photo 10 cut j channel for the top of the window vinyl siding around windows with built in j channel see figure 1 25 vinyl j channel holds water vinyl siding questions building construction diy chatroom home improvement forum how to install j channel for steel siding view of wide window casing and j channel how to install j channel name image jpg views 5703 size 43 0 kb use a zip tool to unlock j channels from vinyl siding unbelievable j channel around garage door install j channels at doors and windows sent from my ipad using tapatalk step 2 of 9 how to install lineals and j channels for vinyl siding and insulation photo 6 notch the j channel garage door overhead austin repair installation pany liftmaster j channel drip edge flashing in white overhead door trim image of vinyl siding trim around windows minimize j channel around openings putting trim on the front door garage door overhead austin repair installation pany liftmaster photo 8 install j channel under the window tafco windows 18x24 steel single hung white vinyl window built in j channel vinyl siding contractor chi offers free repair of garage door trim oxford seymour beacon falls ct you holly springs nc replace cur vinyl windows with new vinyl replacement windows also john after the trim was in and the j channel was installed the siding was put back in place and the job was 50 done and already looked 100 better j channels often are used around exterior windows how to trim a window installing j channel windows door and garage trim many installers opt for universal j channel around windows and doors is it adequate absolutely will it enhance your home s top j channel detail correctly flashing and caulking an exterior door ok here is how i did it there are a couple spots that could have been a little better but all and all it turned out pretty good diagram of panels