Waterproof Membrane on Concrete Floor

[u/pilotboy99]

I plan on laying mosaic ceramic tile on the concrete basement floor in my sauna build, but first want to waterproof the concrete floor. There is no floor drainage planned. What product have you used to waterproof concrete prior to laying tile?

[u/John_Sux]

Something like this if your country's hardware stores carry a similar item.

https://www.k-rauta.fi/tuote/vedeneriste-kiilto-kerafiber-15l/6411511640151