How to Trim Metal Building Windows


Buildings with metal exteriors can have trim around the windows. The trim helps with weatherproofing and can give a new look to any building. Metal trim is installed around a window similar to wood or vinyl trim. Following a few simple instructions the metal building windows can be trimmed and looking great in no time.

Things You'll Need

  • Tape measure
  • Hammer
  • 2-inch siding nails
  • Rags
  • Caulk gun
  • Silicone caulk
  • Marker
  • Tin snips
  • Measure the area for trim. Run a tape measure from the top of the window to the top of the sill and across the top for the horizontal trim.

  • Line up the pieces of metal trim that will be installed and measure each piece that will be cut to fit. Draw a line at a 45-degree angle across the piece so the proper cut can be made. This angle will enable the trim to not all be cut at 90 degrees.

  • Cut along the line with tin snips. Line up the piece to the window to make sure it fits properly. Hammer in a nail every 8 inches on the piece of trim. Cut the piece for the other side of the window using the same process but with the opposite angle. Install it in the same manner. Repeat the process for the top piece.

  • Check for any gaps between the trim pieces and fill them with silicone caulk. Place the silicone caulk into a caulk gun and squirt out a small bead over any gaps or holes.


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