Rule of thumbMandatory
Tub flanked by walls (3-wall enclosure)
FIX-TUB-WALL-01Description
Bathtubs must touch at least one wall. A free-standing tub floating in the center of the room is a freestanding tub install pattern, but in concept-stage layouts the tub must align with at least one wall for plumbing access and structural support.
Why this exists
A bathtub needs three walls (alcove) for waterproofing and a clean shower-curtain attachment. Free-standing tubs require special drainage and waterproofing details.
Categories
AestheticBathroom
Source
Industry consensusno manifest entry
Architectural Graphic Standards (12th Edition)
Section: Bathroom layout
Published 2026-05-09 · last verified 2026-05-09
Solver enforcement
The constraint solver runs check function fix-tub-wall-01 as a hard constraint — layouts that fail are rejected outright.
Plan symbols this applies to
These plan symbols invoke this directive when placed on a floor plan. Click any to see where it's drawn and what other rules apply to it.
Related directives
- Living room minimum size · LIVING-ROOM-SIZE
- Family room minimum size · FAMILY-ROOM-SIZE
- Dining room sizing · DINING-ROOM-SIZE
- Full bathroom sizing · BATHROOM-MIN
- Half bathroom sizing · HALF-BATH-MIN
Last reviewed 2026-05-09.