פירוש על ברכות 51:1

[FOR] A SEFER TORAH, HE MAKES FOR HIMSELF A PARTITION. R’ Yehoshua B’ Laivee says that it is insufficient to place a Torah in a vessel that is in another vessel. One must have a partition between his bed and the section of the room where the sefer Torah is kept. This is not necessary for t’filin and most other holy books. They may be put in a vessel that is within a second vessel.
And this ruling that there must be a partition in the room was said specifically for a sefer Torah. And also for chumoshim¹Tosfos is talking about chumoshim that are written sefer Torah style on parchment and wrapped around a post. They are called chumoshim because they only contain one of the five s’forim of the Torah, not the complete Torah. Tosfos is not referring to the printed chumoshim that we use today. They are like other s’forim and need only be covered. one should be stringent as with a sefer Torah, but for other books, it is sufficient to cover them with any minimal covering.²Tosfos use of the phrase בעלמא כסוי seems to mean a minimal covering. This is a bit perplexing, because we have learned that t’filin and other s’forim require a vessel within a vessel. Perhaps Tosfos is referring to the second vessel, as we have seen about the garment placed over a closet. That garment is the second vessel. It is not really a proper vessel for a sefer but it is acceptable. Perhaps that is what Tosfos means with the phrase בעלמא כסוי.

Otherwise connubial intercourse is prohibited in that room.