Floor Drain Installation and Retrofitting

May 17, 2026

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Installation

First: Trim the pre-allocated drainage opening to ensure it fits perfectly with the floor drain you have purchased, as developers typically leave these openings quite large when handing over a property. Specifically, the aperture size of the floor drain's grate should be kept between 6 and 8 mm to prevent debris-such as hair, sludge, and sand-from entering the drain.

Second: When installing a multi-channel floor drain, the inlets should be utilized and configured according to the specific requirements of the site. A multi-channel floor drain consists of a single drain unit paired with a multi-functional adapter, allowing it to accommodate drainage from multiple sources simultaneously (including washbasins, bathtubs, washing machines, and the floor itself). This structural design effectively resolves situations where a single sewer outlet needs to serve multiple drainage needs.

 

Retrofitting

There are generally two methods for installing a new floor drain in a location where one did not previously exist: First, raise the floor level to accommodate the routing of the new drainage piping; second, core through the concrete floor slab to lay down the new drainage piping.

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