Underlayment Question - Backer board ok on top of felt/metal lath?

[Frank]

Initially planned on a mortar bed for my underlayment. Quickly realized I should've gone with backer board instead. I already installed roofing felt and metal lath. Is it ok to install the cement board on top or should I rip out the paper/lath? Thanks in advance.

-Frank

 

[Lou]

Hi there

Have you got any photos?