I am tiling on a concrete slab which is flat but tilted, and I have just less than 1/2in to fill, at the lowest point.
To compensate for the tilt, should I
- apply adhesive cement on both tile & surface, with a 1/2in notched trowel, or
- fill & level with cement first?
Tiles are 1' x 2'. The affected area is about 50 sqft (about 25 tiles)
The picture shows my levelling lumber along the top of the tile surface, a loose piece of tile, and the gap, with a 1/2 notched trowel for reference.