Tile Backerboard

We are getting ready to lay the tiles on the floor in the laundry room. To do this we needed to lay a tile backer board on the floor. The original floor was two layers of 3/4" subfloor. One of them was removed and we added a 1/4" backer board and 1/4" tile to make it just about level with the kitchen wood floor. Since we are only using a 1/4" backer board it was put down with a layer of thinset under it. Here you can see a picture of one piece down and the thinset being troweled out for the next piece