Halocho #11 – Protection from dangerous items

Any life threatening danger needs preventive protection as appropriate. E.g. a well or pit needs a fence or a cover strong enough to ensure nobody falls in. Similarly one may not own a dangerous dog nor a shaky ladder. Source KSA 190:1-2

Halocho #10 - A fence around your roof

It's a mitzvah to put a fence around ones roof to prevent people from falling off. The fence must be at least 10 tefochim high and must be strong enough that a person can lean on it and not fall. A roof that is never used doesn't need a fence. Source: KSA 190:1

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