French doors are made from wood and glass panels, and are usually installed in pairs. These doors are used with patios and balconies to allow natural light and exterior views into the home. Because they contain large quantities of glass, French doors can pose a security threat to homeowners. Burglars may break glass panels and reach through to unlock the door. To minimize this risk, homeowners must take security precautions with these doors. It is important to secure not only the active leaf, but the inactive or stationary leaf as well.
Things You'll Need
- Single or double deadbolt lock
- Rackbolts (flushbolts)
- Tape measure
Secure the Active Leaf
Use a drill or screwdriver to remove the screws holding the existing lock in place. Many French doors come with fairly weak deadbolt locks. If yours has a bolt that is shorter than 1 inch, replace it with a more secure lock.
Purchase a new deadbolt made of solid steel for the highest level of security. If your deadbolt will be located at least 6 inches from any glass panels, a single deadbolt will be sufficient. If not, purchase a double deadbolt.
Install the new deadbolt into the existing hole in your door. It may be necessary to router or chisel the hole to make it large enough for the new lock. Secure the lock into place using the supplied screws.
Test the lock. Shut the door and use your key or the thumb turn to throw the deadbolt. If it fits securely into the existing strike, you can leave the strike as it is. If not, remove the existing strike and install the one that came with your new lock. Again, it may be necessary to chisel out the hole slightly to accommodate the new deadbolt.
Retest the lock to ensure it is functioning properly. If you've purchased a double deadbolt, you'll need to leave the inside key somewhere near the lock to allow for safe exit during an emergency. Do not leave the key in the lock, as this makes it too easy for burglars to enter the home. Make sure all family members know where the key is located.
Secure the Inactive Leaf
Purchase a pair of solid steel bolts with a 1-inch throw to secure both the top and bottom of the door.
Surface-mount the bottom bolt. Screw it to the face of the door so the bottom of the lock body is flush with the bottom of the door. Throw the bolt so that it hits the floor, then trace around it with a pencil.
Use a drill or router to create a hole in the floor to accommodate the bolt. Test to see if the bolt fits in the hole before covering the hole with the strike plate.
Surface-mount the top bolt. You'll need a unit with a surface-mounted strike to accept the bolt. Screw the bolt casing to the face of the door so it is flush with the top of the door. Align the strike on the frame so it fits tightly to the bolt casing. Screw the strike in place, then test the bolt to ensure it is operational.
Tips & Warnings
- Consider mortising bolts into the door and frame for added security. Choose a unit designed for mortising, then use your router or chisel to create appropriate holes in the top and bottom of the door. Slide the bolt into these holes and screw the cover plates in place. Drill or router holes in the floor and the top of the door frame to accept the bolts, then cover these holes with the strike plates. Test that the bolts are operational before proceeding.
- In some areas, double deadbolt locks are banned by local fire safety codes. If this is true in your area, consider adding flush bolts to the active leaf to keep the door secure when you're away from the home.
French Doors Vs. Sliding Doors
In addition to cost and appearance, consider your lifestyle needs when choosing between French doors or sliding doors.
How to Secure French Doors Against Burglars
French doors are double-opening glass doors that can be installed within the home, connecting two rooms, or lead to an outdoor area....
How to Install Security Doors
Security is a priority for most homeowners. If you're looking for a way to beef up the security of your home, a...
Baby Proofing French Doors
French doors can pose a serious safety risk to babies and toddlers. With large panes of glass and easy-to-open handles, they can...
How to Strengthen Double Doors
Double doors allow for greater volumes of traffic and make a breeze of moving large objects, such as furniture and appliances. One...
What Type of Deadbolt Do You Use on a French Door?
Two doors that meet at the center and are made of rectangular glass panes, which extend the full length of both doors,...
Types of Exterior French Doors
Exterior French doors are available in metal, wood and vinyl. They can be purchased as either pre-hung single doors, sets of two...
The Best Security Locks for Sliding Patio Doors
Sliding patio doors offer the benefits of large windows with the functionality of an entryway. Unfortunately, they are also a primary target...
How to Secure a Door to Prevent Theft
Want to protect your home from burglars? With this free video, learn how to you can keep thieves out of your home...
The Best Way to Secure Sliding Glass Patio Doors
Sliding glass patio doors provide light and beauty to a room. They are also a security risk if you do not secure...