May a davar shebekedusha be said in front of the walls of a bathroom?

As we have learned, one may not be involved in devarim shebekedusha in the vicinity of a bais hakisei (a bathroom), even if it has been cleaned. Shulchon Aruch’s view is that this only applies to an open bathroom--one without walls. As for a bathroom with walls, if the walls obstruct the bathroom and reach down to within three tefachim of the ground, a davar shebekedusha may be said nearby. The walls do not have to be ten tefachim high. The Achronim as a whole dispute the idea that the walls are not required to be a certain height. The Achronim also debate the general question of whether a wall is sufficient to block a bathroom. They explain that bathroom walls are like a graf shel re’I (a chamber pot which contains tzoah). Just as one may not say a davar shebekedusha in front a graf (even if it was cleaned), one may not do so in front of the walls of a bathroom. According to some Achronim, if the tzoah does not touch the walls or if they are made from metal (and are therefore not absorbent), a davar shebekedusha may be said in their vicinity.

סימן פ"ג ס"ק ה' ביאורים ומוספים דרשו 8

Where is an appropriate place to build a sukkah?

Based on the view that one may not say a davar shebekedusha in front of the walls of a bais hakisei, one may not build a sukkah in a place where the open door faces an outhouse. Likewise, a davar shebekedusha may not be said at home in front of an open window which faces a bais hakisei. Under pressing circumstances, one may be lenient unless there is a foul odor. A davar shebekedusha can also be said if one closes his eyes.

ס"ק ה' ביאורים ומוספים דרשו 12

May one daven in front of the closed door of a bathroom?

Many Achronim say that if the walls which were built around a bais hakisei were also built to serve as walls to the home, those walls do not have the status of a beis hakisei. Later Achronim debate whether this leniency applies if the builder did not change the walls (i.e. thicken them) for the sake of the house. They explain that the classification of the walls as bathroom walls does not change without adapting them to serve the house. Some Achronim say that a davar shebekedusha may be said in front of the closed door of a bathroom, since the door serves the room just as it does the bathroom.

ס"ק ה' ביאורים ומוספים דרשו 14 ו16 

• Tzoah is only problematic when it is still somewhat soft. If it has hardened to the extent that it would crack into many pieces when thrown down, it is no longer classified as tzoah and devarim shebekedusha may be said in its vicinity.

• It is forbidden to be involved in devarim shebekedusha in front of mei raglayim. Once it has dried up, one may engage in devarim shebekedusha at the location. According to Shulchon Aruch, mei raglayim is considered dry if it will no longer make one’s hand damp when it is touched. Rema is more lenient and says that as long as the hand that touches the mei raglayim does not become wet enough to make something else wet, the mei raglayim is dry enough.

• A place which was used as a bathroom has the same halachos as actual tzoah, even if it has been cleaned. As such, it is forbidden to be involved in a davar shebekedusha within its four amos or within sight of it.

• May one daven in a modern-day bathroom?

• Can a sink change the status of a room?

• What are the consequences of not treating devarim shebekedusha with the proper reverence?