May 19 , 2020
Measure the Opening Before You Buy
- Pry the interior trim free.
- Chip away drywall to expose framing.
- Pull off the interior trim around the old door and measure the “rough opening” width (distance between studs) and height (floor to beam).
- Pro tip: Make sure you measure to the framing right next to the old door jamb. You may have to cut away overhanging drywall to get at it.
- To check the height, make sure you’re measuring to the subfloor.
- That is, measure to the wood or concrete that the doorsill actually rests on and not a secondary layer of particleboard or plywood (underlayment).
- Select a new sliding glass door that fits your rough opening.
- Pro tip: Once you get your door home, you’ll save a lot of time if you finish any exposed wood surfaces on the door before beginning the installation.