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There is a debate in the matter of “lavud b’emtza”. According to one opinion when there is a hole in a roof we do not look at it as if it’s closed up even when less than 3 tefachim.

Summary

The reasoning of the opinion that Ein lavud b’emtza:

Mishna: In the case of a skylight that is a tefach or less (the size of the skylight has no bearing on the laws quoted here, but it matters to other laws mentioned in that mishna):

If there is a tumah in the room, everything in the room is tamei; anything under the skylight remains tahor.

If the tumah is under the skylight, the entire room remains tahor.

According to lavud b’emtza, a hole smaller than 3 tefachim shouldn’t matter.

The other opinion: In this mishna we don’t say lavud b’emtza because it is a specific law regarding tumah which was taught halacha l’Moshe misinai.

Rabbi Yehuda bar Ilai lectured: If part of a house’s roof caved in and schach was placed there, it is kosher.

Rabbi Yishmael B’rebbi Yosi: Rebbi, you have to explain that there is a condition involved! As my father [Rabbi Yosi] explained:

If there are 4 amos from the schach to the wall it is possul. If there is less than 4 amos it is kosher (14.4). This podcast has been graciously sponsored by JewishPodcasts.fm. There is much overhead to maintain this service so please help us continue our goal of helping Jewish lecturers become podcasters and support us with a donation: https://thechesedfund.com/jewishpodcasts/donate