Double cylinder deadbolts are locks that require a key to open from both the inside and outside.
Double key locks illegal.
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There is no real benefit from using these locks on solid wood or metal.
In the u s there is no single comprehensive law against dual cylinder deadbolts.
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Dual cylinder deadbolts require a key to open the deadbolt from both the inside and outside.
Any door that has a lock within an arm s reach of glass panels sidelights or windows can benefit from a double cylinder deadbolt.
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Danger of double key locks.
Single sided deadbolts have a knob on the inside that is used to unlock and lock them from the inside.
If you mean a double keyed deadbolt lock that requires a key in order to exit the house the oldest code i own that forbids it is the 1970 uniform building code that covered all types of buildings.
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.
M210 double combination marine grade keyless single cylinder deadbolt lock.
She had left the key in the double key deadbolt but investigation revealed that in her rush to escape the fire by turning the lock she had pinched the key causing it to move.
On the other hand single sided deadbolts require key to unlock from the outside only.
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.
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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.
The locks have no handle.
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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.
These locks can create an issue for quick exit if a fire or other hazardous situation occurs.