I've got these split face natural stones that come in 24 x 6 panels, and I was going to install them onto Cement Board using thinset. Checking the boards out (Permabase Plus), they contain silicates which can apparently irritate my asthmatic kid (and cause cancer it seems!).
Despite being more expensive, would Kerdi board work as a backer? I'd rather break my wallet than my kid's lifespan.
Thanks for your help.