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Sliding-Glass Patio Doors

Sliding glass doors are secured by latches not locks. They are vulnerable to being forced open from the outside because of these inherently defective latch mechanisms. This can be easily be prevented by inserting a wooden dowel or stick into the track thus preventing or limiting movement.
 
The blocking devices described above solve half the equation. Older sliding glass doors can be lifted up and off their track and thereby defeat the latch mechanism. To prevent lifting, you need to keep the door rollers in good condition and properly adjusted.
 
You can also install anti-lift devices such as a pin that extends through both the sliding and fixed portion of the door. There are also numerous locking and blocking devices available in any good quality hardware store that will prevent a sliding door from being lifted or forced horizontally. Place highly visible decals on the glass door near the latch mechanism that indicates that an alarm system, a dog, or block watch/operation identification is in place. Burglars dislike alarm systems and definitely big barking dogs.
 

  1. Use a secondary blocking device on all sliding glass doors
  2. Keep the latch mechanism in good condition and properly adjusted
  3. Keep sliding door rollers in good condition and properly adjusted
  4. Use anti-lift devices such as through-the-door pins or upper track screws
  5. Use highly visible alarm decals, beware of dog decals or block watch decal