Installing Door Casings Around Your Sliding Glass Door: An Easy Step-by-Step Guide

Installing door casings in a sliding glass door is a straightforward process that requires basic tools and materials to complete. With a few steps, you can easily update the look of your sliding door.

The first step is to take measurements of the door frame and new door casings. Measure the points where exterior material meets and the door frame ends. Take three measurements, one at the bottom, one in the center, and one at the top. Record your measurements.

Next, you’ll apply flashing around the door frame as a way to keep water out in wet weather. Starting at the bottom, add a piece running up the sides and overlapping the top. Flashing is semi-adhesive, so it is best to staple it with a pneumatic nail gun. A slip sheet, red-rosin paper, should be added to the top underneath the door frame.

Once the flashing is in place, install the door casings. You’ll need pieces that fit the width of the door and screw them securely in place. Depending on the thickness of the door frame and casings, you may need to use shims to level the frame. Place the shims at each corner, in the center, and between the casing and door frame. Make sure to double-check that your door frame is level using a carpenter’s level and framing square.

Finally, you’ll need to caulk the edges of the doorway. Use a quality Exterior-grade caulk that is flexible and paintable. This is important to ensure that you protect the door frame from moisture seeping in. After the caulk has dried, you’ll want to prime and paint the trim to match the colour of the exterior.

Installing door casings in a sliding glass door is a relatively simple process and a great way to give your home an updated look. With the proper steps, you can easily replace or install new casings and prevent water damage due to moisture seepage.