QUESTION
ANSWER
You are correct – this is difficult to fully and accurately assess without being on site and personally inspecting an uninstalled tile, inspecting the completed installation and interviewing the installer.
However, based on the photo you sent I would hazard a guess that the anomalies we are seeing are uncollapsed ridges made with an approximately 3/16” V-notch trowel.
– Mark Heinlein
NTCA Training Director


Mark Heinlein
Mark Heinlein is Training Director for the National Tile Contractors Association. He is Certified Tile Installer #1112 and currently a Ceramic Tile Education Foundation evaluator for the Certified Tile Installer program. Heinlein was the owner of Mark Heinlein Surfaces of Negaunee, Michigan.