May 19 , 2020

How to Replace a Patio Door

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.

Measure

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