In article .com,
writes:

chip is fine where theres no chance of it getting wet. Water only needs
to sit on it once and its a gonner, so quite uselses for bathroom
floors.

The water resistant chipboard for bathrooms survives wet for ages,
much to my surprise. Things like the carpet grippers had all rotted
away, but the chipboard was still rock solid, in spite of being wet
possibly for a year or more, and supporting an internal thermal
block wall (also wet right through).

Standard chipboard flooring disintegrates as you suggests.

--
Andrew Gabriel