For example if there s a window on or nearby the door think of sidelight windows next to a door for example someone could break the window reach in and turn the deadbolt of a single keyed lock.
Double key locks illegal.
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There is no real benefit from using these locks on solid wood or metal.
A bolt retracts when operated by a key or thumb turn only.
These locks can create an issue for quick exit if a fire or other hazardous situation occurs.
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When i was a los angeles county deputy sheriff i had the sad observation of seeing a young woman who was killed by smoke inhalation.
As national consensus codes developed for public use buildings single family codes lagged behind until the mid 80 s when a group of national code.
On the other hand single sided deadbolts require key to unlock from the outside only.
Dual cylinder deadbolts require a key to open the deadbolt from both the inside and outside.
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Any door that has a lock within an arm s reach of glass panels sidelights or windows can benefit from a double cylinder deadbolt.
Double cylinder deadbolts are locks that require a key to open from both the inside and outside.
The locks have no handle.
These locks require a key to lock or unlock the door both from the outside and the inside making them a little safer in one regard.
Single sided deadbolts have a knob on the inside that is used to unlock and lock them from the inside.
Danger of double key locks.
When a double cylinder lock is present even if a burglar breaks the glass he will be unable to unlock the deadbolt from inside without a key.
In the u s there is no single comprehensive law against dual cylinder deadbolts.
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