Our clients purchased this older home with three separate additions. The first addition was a slab tie-in. The second two additions were achieved with off-grade floor joist systems. To further complicate this floor, our clients replaced their cast iron waste lines with PVC. We recommended a decoupling membrane for a plank porcelain tile throughout the entire home. Here we ground down the trench work, feathered the transitions, and removed the high spots throughout the floor in preparation for the crack isolation membrane application. We then sealed/primed the cutback adhesives before applying the Ditra.