Many times, the tile installer is placed in an awkward position by the general contractor, builder, homeowner or whomever is in charge. Many of these people believe that they know more than the tile professional as to what is needed to properly complete the job, including the substrate prep. Unfortunately, many times they are wrong, especially when it comes to a “harmless” surface contaminant such as paint.
The tile industry is driven by the American National Standards Institute (ANSI) requirements as shown here under A108.01.