Blessing on Making a Fence
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Question
On which type of fence do we recite a blessing when making it?
Answer
A fence that is ten tefachim high, which is approximately one meter according to the Chazon Ish, as explained in Chazon Ish (Bava Kama, Likutim, Siman 18), a blessing is recited only on a fence located on the second floor of a residential house that belongs to the same person. However, an ordinary person who only has a roof does not establish a fence there because the dwelling beneath is not his. The Chazon Ish explains that the entire matter of the roof is proven from the conditions of the mitzvah, which is only a decree of the scripture. Otherwise, why, if it is not used for dwelling or is less than four amot, does it not require a fence, even though there is also a danger? This is because, in such a case, it is not due to the mitzvah, but only because of 'do not place blood in your house'.
Source
Shulchan Aruch, Choshen Mishpat, Siman 427