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Answer: The gemara (Menachot 39a) posits that the "upper knot" of tzitzit is a Torah-level requirement, as we learn from the Torah’s connection between tzitzit and sha’atnez. Most Rishonim (see Beit Yosef, Orach Chayim 11; see China D’chayei 8, who cites dissenters) posit that a double knot is needed to connect the tzitzit to the garment, as we find that making a simple single knot is not a violation of Shabbat (Shabbat 74b).
There is also a machloket what the upper knot is – the part closer to the garment or further away from it (see Mishna Berura 11:66). A relatively strong consensus holds that it is the one further away from the garment, where it also secures the gedilim (section containing all of the string wrappings).
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Rava deduces from a halacha regarding a ripped string that one is supposed to make a knot between the chulyot (Menachot 38b). The gemara (ibid. 39a) deflects the proof by suggesting that knots were sometimes made but were not required. Many claim that while Chazal expected/preferred for there to be multiple chulyot and knots, basic Halacha only requires chulya with a minimum of three revolutions of a tzitzit string around the others (Mishna Berura 11:65).
The preference of more chulyot and/or knots is due to their being reminiscent of a variety of themes and numerical values. We will mention a few (the Mishna Berura 11:65 cites some): There should be seven knots in each tzitzit corresponding to the seven firmaments, but we leave out two knots when we do not have techeilet (Shut Radbaz 2333) because it is the techeilet that reminds of the sky. The gematria of tzitzit is 600, and when one adds eight strings and our present-day five knots, it comes to 613. 8+5 is also the gematria of echad. The five knots also remind us of the five books of the Torah. Since the five knots are doubled, it is also reminiscent of the ten sefirot (a Kabbalistic concept). None of these numerical significances are absolute requirements, as is true of the number of wrappings (Mishna Berura ibid.), but they are religious/spiritual preferences.
It is also possible that some of the gains of knots in between the chulyot do not depend on there being halachic knots. Single knots also are able to hold each chulya in place, take up some space, which is important (see Shulchan Aruch and Rama, OC 11:14), and make the different chulyot, with their significant number of revolutions, noticeable. The fact that a single knot is more secure than usual when it is in the midst of a g’dil that is surrounded by double knots might also give it prominence (see Maaseh Betzalel to Rikanati, Tzitzit 3). Again, despite this, the Shulchan Aruch at least recommends double knots each time.
There is another reason to want at least one of the middle knots to be a full halachic one. Sometimes the top knot starts getting looser, even to the point that it is no longer a halachic knot (see Living the Halachic Process IV, F-3). We are not usually overly concerned about this because the minimum requirements of the tzitzit are met when a minimal gedil is followed by a double knot. However, in your case, were the top knot to reach that point, there are no fallback knots after the beginning of the gedil.

P'ninat Mishpat P'ninat Mishpat: Realtor’s Fee on Large Commercial Building – part I
(based on ruling 85031 of the Eretz Hemdah-Gazit Rabbinical Courts)
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P'ninat Mishpat P'ninat Mishpat: Realtor’s Fee on Large Commercial Building – part I
(based on ruling 85031 of the Eretz Hemdah-Gazit Rabbinical Courts)
(based on ruling 85031 of the Eretz Hemdah-Gazit Rabbinical Courts)

P'ninat Mishpat Complaints about Contractor’s Work – part II
(based on ruling 83037.1 of the Eretz Hemdah-Gazit Rabbinical Courts)
(based on ruling 83037.1 of the Eretz Hemdah-Gazit Rabbinical Courts)

Chemdat Yamim Moreshet Shaul: The Goal of an Agricultural Yeshiva – part I
Based on Siach Shaul, Pirkei Machshava V’Hadracha p. 263 (address at the laying of the cornerstone of the Yeshiva Chakla’it in Kfar Haroeh)
Based on Siach Shaul, Pirkei Machshava V’Hadracha p. 263 (address at the laying of the cornerstone of the Yeshiva Chakla’it in Kfar Haroeh)

Chemdat Yamim The Goal of an Agricultural Yeshiva – part II
Based on Siach Shaul, Pirkei Machshava V’Hadracha p. 263 (address at the cornerstone laying for the Yeshiva Chakla’it in Kfar Haroeh – 1938)
Based on Siach Shaul, Pirkei Machshava V’Hadracha p. 263 (address at the cornerstone laying for the Yeshiva Chakla’it in Kfar Haroeh – 1938)

Re'e NEVER EXTREME EXCEPT ISRAEL
Parshat Re'eh
Judaism is against extremism, so how can we understand the seemingly extreme statements found in our sages in favor of living in the Land of Israel and against living in Chutz laAretz? The article deals with the seeming contradiction between the strength of Free-Will and the strength of being influenced by our surroundings.

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Parshat Eikev
Description: The 7 Haftarot we read after Tisha B'Av ("Shiva D'Nichemta") surely get us excited that they're coming TRUE, and awaken us to yearn, dance & join the return to Zion! The short article also deals with the problems and solutions facing the American Jewish community as discussed at a recent panel, as well as the question why Jews come from America to Israel to help when we face problems, but Israelis don't come to aid Jews in America when they face anti-Semitism.

P'ninat Mishpat P'ninat Mishpat: Complaints about Contractor’s Work – part II
(based on ruling 83037.1 of the Eretz Hemdah-Gazit Rabbinical Courts)
(based on ruling 83037.1 of the Eretz Hemdah-Gazit Rabbinical Courts)

Chemdat Yamim Moreshet Shaul: Twin Foundations
Based on Siach Shaul, Pirkei Machshava V’Hadracha p. 690
Based on Siach Shaul, Pirkei Machshava V’Hadracha p. 690








