To create curved shapes on a vertical wall, follow these steps:
Cut bendable wooden strips into the desired curve shape.
Assemble and fix the curved strips with horizontal wooden slats.
Apply fire-resistant boards and waterproof gypsum boards as the base layer on the frame.
Create grooves on the back of the gypsum board to allow for bending.
Once the base is prepared, smooth the surface by applying putty to avoid issues like unevenness or hollowing.
For areas exposed to water, an additional waterproof layer should be applied over the putty before installation.