How to Install Vinyl Garage Door Trim

Written by samantha volz
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How to Install Vinyl Garage Door Trim
Add trim around a garage door for decorative and protective benefits. (Jupiterimages/ Images)

Vinyl siding installation on a building is a fairly straightforward process until you reach one with an opening, such as a garage. Siding installation kits come with special trim pieces to surround a garage for a better appearance and protection from moisture and dirt entering the garage through openings around the door. Properly attaching these trim pieces will give your garage's siding installation a finished look and prevent leaks and dirt from entering.

Skill level:
Moderately Easy

Things you need

  • Silicone caulk
  • Measuring tape
  • Tin snips or utility knife
  • Nail gun or drill
  • Nails or screws

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  1. 1

    Seal the area around the garage door with silicone caulk. Wet your finger and push the caulk into any gaps between the wall and the door. This will prevent moisture damage on the trim and keep moisture from leaking behind the siding itself. Allow the caulk to dry before continuing.

  2. 2

    Measure the length of the top of the garage door. Add twice the width of a piece of the siding trim to the measurement. For example, if your trim is 4 inches wide, add 8 inches to the measurement.

  3. 3

    Cut vinyl trim to fit the measurement plus the addition. Cut vinyl siding with tin snips or a sharp utility knife.

  4. 4

    Center the cut vinyl trim above the garage door so that there is an equal amount of extra siding dangling over each side of the door. Nail or screw the trim to the area above the door with galvanised finishing nails or masonry screws, depending on the material of your structure. Make sure that the fastener will penetrate at least 1-1/2 inches for the best hold.

  5. 5

    Work your way down both directions of the trim, installing a nail or screw every 6 inches. You also should install a fastener no more than 2 inches from each end of the trim.

  6. 6

    Measure the distance between the overhang of the top trim to the base of the garage door on each side and cut two vinyl trim pieces to fit. Install these pieces as well, attaching the first fastener just below the joint where the side trim meets the top trim and moving every 6 inches down from there. Continue until the trim is secured.

Tips and warnings

  • Read your siding manufacturer's instructions regarding installation. Some materials might require different fasteners.

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