Measure from the top edge of the garage doorframe to a spot 3 4 inch below the edge of the boxing.
Installing vinyl j channel around doors.
J channels are used around windows and doors on inside corners and where the siding meets the soffit or roof at an angle.
Installing vinyl siding around windows.
Well done installation of the j channel gives the vinyl siding a professional look in corners doors windows and other edges of your home.
Install vinyl j mold around the edges of the garage doors and windows.
After installing the new door you will need new j channel trim around the door to finish the cut ends neatly.
Consult with your siding manufacturer to learn whether other proprietary siding.