Do you know all the proper steps to installing the Hardie? Only asking cuz that info along with which thickness to use where, is contained in the same brochure. Sounds like you may not have read about how to do it.
TILE GUY - retired- TROY, MI - Consulting by phone/internet - PAYPAL
DITRA Installs - KERDI Watertight-Mold-Free Showers. I have NEVER made a mistake, I thought I did ONCE, but, I was WRONG!A+ BBB rating - est. 1987 - over 50 yrs. exp.