Sukkah 17a
סוכה י״ז א — ד"ה מַתְנִי׳ הִרְחִיק אֶת הַסִּיכּוּךְ מִן הַדְּפָנוֹת
Sukkah 17a:1
Discusses the structural requirements of sukkah walls and roofing, including the relationship between valid schach, invalid roofing, and the enclosing walls; it is an important sugya for determining whether a raised wall can function as דופן עקומה.
מַתְנִי׳ הִרְחִיק אֶת הַסִּיכּוּךְ מִן הַדְּפָנוֹת שְׁלֹשָׁה טְפָחִים — פְּסוּלָה. בַּיִת שֶׁנִּפְחַת וְסִיכֵּךְ עַל גַּבָּיו — אִם יֵשׁ מִן הַכּוֹתֶל לַסִּיכּוּךְ אַרְבַּע אַמּוֹת, פְּסוּלָה. וַאֲמַרוּ לִי: בַּר מִינַּהּ דְּהַהִיא, דְּרַב וּשְׁמוּאֵל אָמְרִי תַּרְוַיְיהוּ: מִשּׁוּם דּוֹפֶן עֲקוּמָּה נָגְעוּ בָּהּ.
MISHNA: If one distanced the roofing from the walls of the sukka at a distance of three handbreadths the sukka is unfit, because three handbreadths of open space, even adjacent to the walls, render the sukka unfit. In the case of a house that was breached, creating a hole in the middle of the roof, and one roofed over the breach, if from the wall to the roofing there are four or more cubits of the remaining original roof, it is an unfit sukka. If the roofing is less than four cubits from the wall, the sukka is fit, based on the principle of curved wall; the remaining intact ceiling is considered an extension of the vertical wall. And they said to me: Cite proof from the mishna, apart from this case, as both Rav and Shmuel said that in this case, the Sages in the mishna touched upon the principle of curved wall. In other words, the fact that this house is a fit sukka is unrelated to the minimum measure of unfit roofing. It is fit due to the principle of curved wall.



