cement board under bathtub

There's mold under my cast iron bathtub so I'm going to pull it out into the next room to redo the subfloor. The bathtub is resting on 1/4" plywood over the subfloor. I'd like to replace the plywood with something that doesn't grow mold. Would 1/4" cement tile backer board do? The bathtub weighs about 350 pounds and half that weight would be resting on the 5/16" thick edge of the cast iron apron. Would cement board under a lot of pressure crumble over time? Or some other material? thanks Laura
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Apr 11, 8:13pm, snipped-for-privacy@grex.org (Graven Water) wrote:

How did you figure that there is mold under the tub, which most people never see!!! No Mold grows because of moisture, is it on an outside wall, is it a contractor telling you, it could be condensation causing it and your contractor is a crook and its normal for your design which is defective in itself. You are jumping to conclusions.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.