- Question: Why do you need to check on all the mezuzahs of your house and can’t rely on a chazaka after 3 of them are still found to be kosher?
A. The Shulchan Aruch (Yoreh Deah 291:1) says an individual household should check there mezuzahs twice every 7 years and mezuzahs of the public twice every fifty years.
B. A chazaka is an assumption or pattern that is established after 3 times so if 3 mezuzahs were found to be kosher why can’t one assume that all the rest of his mezuzahs in his house are kosher?
Answer:The Birkay Yosef and Pischei Teshuva (1) both say that you have to check all the mezuzahs put up the same time as the 3 because not all the locations are the same, environment differences, colder, warmer, rain, snow, etc.