I've been held up due to cold weather. One of the long-pole-in-the-tent items I had to accomplish was to pour Ardex 1400 leveling compound on the floor to level it out. Since I had to mix the stuff out on the back porch, I needed the temperature to be relatively warm. Finally, a couple days ago, we had a day that the temps got up to 66F. I had my son come out to help me mix and pour the leveling compound. I used a special tool called a gauge rake to spread the stuff on the floor at an even depth (1/4"). I was pretty happy with the end result. When it dried and had leveled out, the floor was (is) nearly perfectly level.
The next step was to cut the Ardex Flexbone decoupling mat and fit in to the floor., which I completed yesterday. The decoupling mat is probably overkill, but in the event the concrete slab were to crack due to changes in temp, shifting foundation, etc., the decoupling mat serves to isolate the slab from the porcelain tiles, thus (in theory) preventing any cracks from transferring to the tiles. Like I said, probably overkill for this job, but I just felt it was good insurance against future issues.
Today I have rented a heavy roller from Home Depot and will be gluing the flexbone to the newly leveled concrete slab using Ardex 77 thinset. I'll be using a 1/16th inch v-notch trowel to adhere the flexbone mat to the slap, then rolling over it with that heavy roller. Hope to get that finished today.
Next step (finally) is to actually lay the tiles!
The gauge rake spreads material at a consistent thickness (adjustable).
Flexbone decoupling mat ready to be glued to the newly leveled floor.