Parts of a French Patio Door

French patio doors can be a stunning addition to any home. Below is a diagram highlighting the different components of a typical French patio door.


  1. Head – The main horizontal member which forms the top of the patio door frame.
  2. Handle-Activated Locking System – Many patio doors use a handle-activated lock system. A multi-point lock system provides extra security, fastens your door securely in place and prevents warping brought on by the elements.
  3. Insulated Glass – A combination of two or more panes of glass with a hermetically sealed air space between them. Optional argon gas may be used between panes to further improve thermal performance and energy savings.
  4. Lock Stile – The patio door vertical structural member which closes against the jamb of the surrounding frame; on the opposite side from the hinges.
  5. Hardware – Depending on the brand of French patio door you purchase, you may have multiple options for hardware including stainless-steel hardware and aluminum-reinforced lock/latches for additional strength and security. Talk to a dealer or contractor about hardware that meets or exceeds forced-entry codes in your area.
  6. Weather-stripping – Weather-stripping is essential to ensure efficient, weather tight seals for your door.
  7. Sill – The main horizontal member forming the bottom of the patio door frame.
  8. Top Rail – The top horizontal structural member of the patio door frame.
  9. Hinge – A device that allows the turning or pivoting of a part on a stationary frame. (Milgard French patio doors feature a heavy-duty adjustable hinge which allows vertical and horizontal panel adjustments.)
  10. Hinge Stile – The patio door vertical structural member where the door pivots; found on the same side of the hinges.
  11. Jamb – The patio door frame members forming the top, sides and bottom of a patio door frame.
  12. Bottom Rail – The bottom structural member of the patio door frame.

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