I have a glass block shower that was not installed properly. I need to know the proper way to regrout. The mortar is disintegrating. I was told I need a water-resistant mortar and to add an agent to make sure it’s waterproof. Does anyone know the proper way?

  • Are you going to start fresh or try and repair and reseal the existing mortar?
    – JACK
    Commented Sep 18, 2019 at 21:10
  • Glass Block Mortar is a common pre-mixed type that you will find at home stores.
    – JPhi1618
    Commented Sep 18, 2019 at 21:30
  • "What type of grout..." - if anyone answers the title, @me, because I have no idea how, or with what, to set glass block.
    – Mazura
    Commented Sep 19, 2019 at 2:47

1 Answer 1


Any fortified thin set will work. I have used colored grout with add mix several times for glass block shower walls. Once the mortar is cured I then seal it the same as any tile job. There are pre mixed glass block mixes it is usually white.

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