In Jain practice, this is not a universal scriptural rule that you can touch a wall but not a door during periods.

What you are hearing is usually a family or local custom, not the same everywhere in Jainism. Different households may keep different rules about:

• touching kitchen items,
• entering derasar/puja area,
• touching religious books,
• or touching certain household objects.

A wall is often seen as just a neutral surface, while a door may be treated as a more “used” or “threshold” object in some customs, so people may make stricter rules about it. But this is custom-based, not a fixed Jain principle for all Jains.

From the Jain point of view, the main emphasis is on:

• Ahimsa
• shuddhi or cleanliness
• maintaining respect for sacred places and rituals

So if a specific Jain family says “don’t touch the door,” that is usually their house rule, not a universal Jain teaching.