Related for Sukkah 1:8

הַמְקָרֶה סֻכָּתוֹ בְשַׁפּוּדִין אוֹ בַאֲרֻכּוֹת הַמִּטָּה, אִם יֵשׁ רֶוַח בֵּינֵיהֶן כְּמוֹתָן, כְּשֵׁרָה. הַחוֹטֵט בְּגָדִישׁ לַעֲשׂוֹת בּוֹ סֻכָּה, אֵינָהּ סֻכָּה:

If one roofs his succah with spits, [which are not fit for schach because they do not grow in the ground] or with bed boards, [which can acquire uncleanliness] — If the space between them is like them (in size), it is kasher. [Not "exactly like them and not more"; for the place of the spit is considered parutz ("breached"), and when he puts kosher schach between each spit, if the space between them is exactly like them, then the parutz is the same as the amud (the part that is intact), and it is pasul. Perforce, then, the space between them must be somewhat larger than they are.] If one hollowed out a stack of sheaves to make a succah of it, it is not a succah. [If he took from the lower sheaves near the ground and hollowed out a space the size of a succah, the schach is found to be already made and standing of itself — but the Torah said: "shall you make," and not from what is already made. But if there were already in it the space of a handbreadth extending seven (handbreadths) which he made to be schach, and he hollowed it out until he elevated the space to a height of ten (handbreadths), this is not considered as already made, for he hereby adjusts only the walls; and "shall you make, but not from what is already made" does not apply to the walls — so that it is like a succah less than ten (in height), which was hollowed out to bring it up to ten.]

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