Charlie, if you understand it as a couple of posters (Sam2 and Benignuman) have explained it, all of your questions fall away.
The chiyuv to build a mechitzah (either a wall or balcony) in a situation where kalus rosh is likely, is d’Oraisa.
Charlie, if you understand it as a couple of posters (Sam2 and Benignuman) have explained it, all of your questions fall away.
The chiyuv to build a mechitzah (either a wall or balcony) in a situation where kalus rosh is likely, is d’Oraisa.