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Summary
We learned: Rabbi Ami bar Tivyumi: Worn out clothes are possul to use as schach.
Question: What type of worn out clothes are we referring to?
Abayye: This refers to rags that are smaller than 3x3 fingerbreadths. Since they are no longer useful, even for the poor, they lose keili status.
A supporting beraisa: “The remnants of a mat [it was used as a seat and is considered a keili which is mekabel tumah] of straw or grasses, although they are too small to be used [less than 6x6 tefachim], are possul for use as schach. (This is a proof to Rabbi Ami bar Tivyumi). A large reed mat may be used as schach (because it’s made for the purpose of schach. Nowadays it’s possible to buy a mat for schach if one is certain it was produced for this purpose). But a small mat [which is made to use as a seat] is possul. Rabbi Eliezer: A large mat is also mekabel tumah and possul for schach.” (Rabbi Eliezer would also agree that if the mat was manufactured specifically for schach, it would be kosher).
13.3: If one hollows out a haystack to make it a sukkah, it is not a sukkah. [Because it was never covered with schach. The top hay was put on top of other hay, it wasn’t placed as a roof].
Rav Huna: If there was an area of 7x7 tefachim with the height of 1 tefach that was covered by the haystack, then it is kosher. [Since the hay was placed as the ‘covering’ for an ohel, it can be considered ‘placed for a roof’ (see 8.2)].