Because this type of deadbolt requires a key to unlock it from the inside, it can be dangerous in the event of a fire or other emergency when residents need to exit the home quickly. That said, only install a double cylinder deadbolt lock when necessary. This type of deadbolt is ideal for locks that are in close proximity to a window, as is the case with a front door that’s flanked by sidelights. Double: A double-cylinder deadbolt requires a key to lock or unlock it from either side.From the inside, the door can be locked and unlocked with a thumb turn. Single: The simplest type of deadbolt lock has a single cylinder that is operated from the outside of the house using a key.There are three types of deadbolt locks you can install on your home’s exterior doors: RELATED: 7 Things to Know Before Replacing Door Locks Types of Deadbolts Even if your insurance company doesn’t give you a break, the fact that you have a deadbolt should decrease the likelihood that your home will experience a break-in, thus reducing the odds that you’ll have to file an insurance claim that could increase your premium. Some homeowners insurance companies provide discounts for homes with deadbolt locks on all exterior doors. Prying open a door with a deadbolt latch is also harder because a deadbolt extends a full inch into the door jamb as opposed to the half inch of a spring lock. Deadbolts, on the other hand, use a locking device that is impossible to force back into the door. Even the highest quality spring bolt door lock can be easily defeated by the average burglar. There’s a reason most exterior doors have a deadbolt lock. Measure carefully and be sure you’re using the proper size hole saw before you start drilling. If you measure incorrectly, you could end up drilling a hole in the wrong spot, ruining the door in the process. Adding a deadbolt to a door involves measuring and drilling holes to fit the deadbolt lock. Some areas have fire safety codes that do not allow a locked exit.Although installing a deadbolt lock is a job most DIYers can handle, there is risk of damage to the door if you’re not careful. Note that single cylinder dead locks (with an unlocked twist mechanism on the inside of the door) do not have this problem, and therefore are most commonly used on fire exits. Some fire departments suggest putting the key on a small nail or screw near the door at floor level, since the cleanest air is at floor level and one may be crawling to get to the exit, thus placing the key where it is easiest to find. The risk can be mitigated by locking the deadlock only when there are no occupants inside the building, or leaving the key near the keyhole. This is an avoidable cause of death in house fires. In the event of a fire, occupants will be prevented from escaping through double-cylinder locked doors unless the correct key is used. The double cylinder design raises a safety issue. Single cylinder with removable thumb-turn.Push-button deadbolt (mechanical or electrical).Exit-only function (no external cylinder).Classroom-function (thumb-turn only unlocks door).Vertical deadbolts resist jimmying, in which an intruder inserts a crowbar between the door and the jamb and attempts to prise the bolt out of the door. Ī variant of the standard deadbolt is the vertical deadbolt, invented by Samuel Segal. Some lock manufacturers also have a "lockable" knob: a key is always needed on one side (usually external), and a twist knob can be used on the other (internal), unless a button has been pressed, in which case a key is also needed on the internal side. Double cylinder locks are sometimes banned from areas because they can be difficult to open from the inside and violate fire safety regulations. This prevents unwanted unlocking of the door by forced access to the interior twist knob (via a nearby window, for example). Double cylinder locks will accept a key on both sides and therefore do not require (and often do not have) any twist knob. A single cylinder deadlock will accept a key on one side of the lock, but is operated by a twist knob on the other side. A deadbolt is often used to complement a spring-bolt lock on an entry door to a building.Ī deadlock, if it is cylinder operated, may be either single cylinder or double cylinder. A deadbolt can therefore make a door more resistant to entry without the correct key, as well as make the door more resistant to forced entry. The more common spring bolt lock uses a spring to hold the bolt in place, allowing retraction by applying force to the bolt itself. It is distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle. Then, using a key from either side of the door, a bolt is thrown into the door frame, thus securing the door. Door with two locks, one in the doorknob and a separate deadboltĪ deadbolt or deadlock is a type of lock morticed into a wooden door. For other uses, see Deadlock (disambiguation).
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