Toilet - sealing flange to slab

Do toilet flanges have to be sealed to the slab? Does the flange have to be sealed to the sewer pipe? Can mould get under the linoleum from other than the wax seal?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

The flange has to be mechanically attached. A 'seal' (as in watertight) is not necessary.

Yes.
Not likely.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Abe

The average bathroom has plenty of other moisture sources besides the toilet.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

What about a high water table? What about a broken drain pipe and a downstream pluggage? Seems like either could give infiltration of sewage water. Also seems that either could be prevented by sealing the flange to the slab.
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.