Reference for Sukkah 1:6
מְסַכְּכִין בִּנְסָרִים, דִּבְרֵי רַבִּי יְהוּדָה. וְרַבִּי מֵאִיר אוֹסֵר. נָתַן עָלֶיהָ נֶסֶר שֶׁהוּא רָחָב אַרְבָּעָה טְפָחִים, כְּשֵׁרָה, וּבִלְבַד שֶׁלֹא יִישַׁן תַּחְתָּיו:
It is permitted to use boards as schach. These are the words of R. Yehudah. R. Meir forbids it. [With boards the size of four handbreadths, which (size) is considered "a space of significance," all agree that it is pasul. With less than three, all agree that it is kasher (for in that instance they are like reeds). Where do they differ? (With boards) from three to four handbreadths. R. Yehudah holds that since that is not "a space of significance," we do not decree (against it) lest he sit under the ceiling of his house. And R. Meir holds that since it leaves the status of lavud (see 1:1), we decree (against it), lest he say: "What difference does it make whether I use these as schach or sit under the ceiling of my house?" The halachah is in accordance with R. Yehudah.] If he placed upon it a board which is broader than four handbreadths, it is kasher, so long as he does not sleep under it.
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