Can I use hydraulic cement as a top surface to fill in gaps in cement board in a cold/ hot outdoor weather area? This will be under the tile.

  • What kind of gaps? That seems important information to have before we answer. – isherwood Dec 14 '20 at 19:03
  • I have used hydraulic cement around toilet & water pipes (hot and cold) coming up but as it is expensive compared to mortar I usually use mortar. To fill cracks and level sheet to sheet differences. It would probably work ok though. – Ed Beal Dec 14 '20 at 19:43
  • I needed to make a bull nose form so I scored the cement board and formed it around a 2in pipe. The form is solid but now I need to fill in the grooves left by the scoring that run the length of the work. I dont want the form to fail or tile to pop off . – Jason Walker Dec 14 '20 at 20:48

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