Is a Sukkah built underneath a house roof valid, and must the roof be removed or opened before placing schach?

SukkotPesachSukkot

Synopsis

A Sukkah under a roof is invalid. The roof must be opened or removed before schach is placed. If schach is placed while the roof is still closed, subsequent opening of the roof does not validate the Sukkah unless the roof was opened before schach was placed.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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