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DEAD BOLTS... Offer Good Protection
The bolt should extend at least one inch beyond the door edge. Other locks which use an interlocking principle (e.g. jimmy resistant rim locks) also offer good security.
Cylinder Rim Dead Bolt Lock
Dead bolt locks offer good security because they can be opened only with a key or thumb turn. A good dead bolt extends at least one inch when locked.
Double Cylinder Dead Bolt Lock
WARNING: Double cylinder dead bolt locks
(those that can only be opened with a key)
can be a FIRE HAZARD!
Because of this fire hazard, state, county and city building codes make it illegal to install this type lock on doors of family type dwellings below the third floor level. Dead bolt locks that utilize a thumb turn are exempt from most restrictions.
Single Cylinder Dead Bolt Lock
A single cylinder deadbolt (thumb turn type) is not recommended for doors that have glass within forty inches of the lock. Strengthening of the glass by adding a super aggressive adhesive type film (similar to the type used to tint automobile windows) is suggested as an alternative to metal grates or poly-carbonate glass. This type of film is available in a clear form as well as in many different colors. While the film itself will not prevent the glass from being broken, when installed properly to the inside of the glass, it does prevent the glass from being removed from the window pane. Once the glass is broken, the film attached to the inside of the glass retains the broken pieces and makes it very difficult to cut through.
Before adding this super aggressive adhesive film. take a minute and discuss the proper installation techniques with your Crime Prevention Officer. If applied properly, this method of strengthening your windows will toughen the glass enough that a burglar will probably give up, instead of taking enough time and effort to break through it.
All of the locks are recommended for residential use, with the following provisions:
Cylinder Rim Dead Bolt Lock
- Proper installation on a substantial door of solid wood, wood stave, or wood core construction, or an equivalent metal or metal clad door.
- The strike plate (or strike box) is of durable duality steel, and is securely anchored to a substantial frame with at least two screws (minimum 2 inches long).
- A reinforcing sleeve (wrap-around) or two escutcheons or rosettes can be added to improve the quality of some locks installed on wood doors. The escutcheon should extend to within 1/2 inch of door edge, and must be constructed of metal (at least 1/8 inch in thickness),
- No locking device offers an absolute guarantee against burglary attack.
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