Should the rough-in valve trim be installed onto backer board or tile?

The rough-in valve trim for a shower or bathtub typically installs onto the backer board rather than directly onto the tile.


Backer board provides a stable and secure mounting surface for the trim, ensuring proper alignment and support.


Installing the trim onto backer board allows for easier adjustments and modifications during the installation process.


Once the trim is securely attached to the backer board, the tile can then be installed around it, providing a finished and cohesive look to the shower or bathtub area.

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