Interior floor wets during rain at a balcony door.
Use the site evidence to agree a project-specific method with the responsible engineer, concrete producer, manufacturer or specialist applicator.
Interior floor wets during rain at a balcony door.
Check balcony falls, door sill, track weeps, membrane upstand and façade interfaces.
Low threshold, blocked weeps or discontinuous membrane can route water indoors.
Coordinate drainage, sill flashing and waterproofing continuity at the doorway.
Detail the threshold before installing frames and finishes; preserve door drainage paths.
Use controlled spray testing and inspect inside while the assembly is exposed.
A new floor coating cannot correct a blocked or incorrectly flashed door track.
References inform the topic; they do not endorse a specific product for this project.