When I bought my house, its marble floors appeared to be in good condition. However, they have steadily chipped, fissured and fractured until reaching their current fragmented state. The picture shows where the gap in the subfloor directly aligns with the cracks in the overlaid tiles.
This post discusses improperly installed tile that was mortared directly over a subfloor. Some of the responders warn the original poster to redo the project immediately, and to install a backer board before mortaring the tiles.
Is there any alternative to tearing up the entire floor? I want to ensure that no other options remain before fully removing them.
Thanks in advance.