You only need to lay backerboard or cementboard on surfaces where water will be present. Such as counter tops, bathroom walls and shower stalls. If you needed to lay cement board, the smooth side faces down.
Mastic is a smooth textured tile adhesive that is generally used on walls or countertops. Mortar mix is a stronger adhesive that is used on floors.
Mastic is a smooth textured tile adhesive that is generally used on walls or countertops. Mortar mix is a stronger adhesive that is used on floors.