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Comment by gravypod | Hacker News Reader

Neither is grout. Grout is water permiable. You shower is water proof from the water proof backing we install the tile on top of.

Cement board + roll on or something like kerdi system.

https://youtu.be/B5DVpruLygw?si=jD8eMHHGQoWG4hI2

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This is why you pay the premium for epoxy grout. When we redid our house we used only epoxy grout and cleaning it as as simple as using a foaming tile spray.

This is not always a great idea. Especially if you have a water proofing membrane that allows drying out. You never want to trap moisture in a cavity. You want to be able to dry into the wet side.

right, but lime will be washed away by the water if no waterproof layer is added

It is not lime as in the fruit, it is lime as in the material (CaOH2). Lime the material is the binding agent in lime plasters. It is not likely to get washed away.

caoh2 is water soluble (slightly). the question was about anti-mold properties and it is commonly used for these properties in paint for example in cellars but it will lose these properties when too wet. so it's not used in bathrooms.

Sure but lime plaster can be used in bathrooms on the non shower walls as there's no running water but lots of moisture/humidity which leads to mold growth. As far as using it in the grout behind tiles, you may have a point.

I'm considering applying lime wash between the tiles regularly but not sure what the results will be.

I suspect the term you were looking for in your original comment was insoluble, that is, a substance not (readily) dissolved into water.

Concrete is insoluble (it won't wash away, contrast with lime), but not water-proof.

My shower is waterproof because it’s a one-piece insert made of plastic.

Other shower materials that aren’t absolutely insanely stupid include glass, quartz, and other non-porous materials.

Because biology.

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