CTI Cheat Sheet 2026

The 30 highest-yield CTI facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is the function of a tile nibbler tool? → Removing small irregular pieces of tile for fitting around obstacles
2. What is the most common adhesive used for tile installation? → Thinset mortar
3. How should a CTI professional handle a situation where project scheduling & resource management protocols conflict with practical constraints? → Document the conflict and seek guidance from appropriate authorities
4. What ethical consideration is most relevant to safety regulations & osha compliance in CTI practice? → Maintaining confidentiality and acting in the best interest of stakeholders
5. According to ANSI A118.1, what minimum tensile bond strength (in PSI) must dry-set portland cement mortar achieve after curing? → 200 PSI
6. What is a common challenge professionals face when applying quality control & inspection methods principles in Certified Tile Installer? → Balancing theoretical knowledge with practical application
7. Which quality improvement method is most applicable to safety regulations & osha compliance in Certified Tile Installer? → Plan-Do-Check-Act (PDCA) continuous improvement cycle
8. What is a dry layout? → Laying out tiles before applying adhesive
9. What is the main advantage of an angle grinder with a diamond cup wheel over a standard wet saw for tile work? → It can grind down high spots and lippage on installed tiles
10. ISO 13006 classifies ceramic tiles primarily based on which two characteristics? → Water absorption rate and manufacturing method
11. Per ANSI A108.02, what is the maximum allowable variation in floor substrate flatness for standard tile installations? → 1/4 inch in 10 feet
12. Why is a tile layout plan important? → To achieve symmetry and avoid narrow cuts
13. Which quality improvement method is most applicable to quality control & inspection methods in Certified Tile Installer? → Plan-Do-Check-Act (PDCA) continuous improvement cycle
14. What is the recommended minimum grout joint width? → 1/8 inch
15. Why is it important to back-butter a tile in addition to troweling the substrate? → It improves adhesion and helps achieve full mortar coverage on the tile back
16. According to TCNA EJ171 guidelines, how frequently should movement joints be placed in interior floor tile installations? → Every 8 to 12 feet in each direction
17. Which technology trend is most likely to impact materials science & specifications in the CTI field in coming years? → Digital tools for enhanced data collection, analysis, and reporting
18. What is the purpose of a waterproofing membrane? → To prevent water penetration and mold growth
19. Why must a wet saw blade be continuously supplied with water during cutting? → To cool the blade and suppress silica dust
20. Which technology trend is most likely to impact quality control & inspection methods in the CTI field in coming years? → Digital tools for enhanced data collection, analysis, and reporting
21. What is the recommended trowel size based on tile size? → Larger tiles need larger notches
22. ANSI A118.10 establishes performance requirements for which type of membrane used in tile installations? → Load-bearing (bonded) waterproof membranes for thin-set tile
23. What is the primary purpose of project scheduling & resource management in the context of Certified Tile Installer? → To ensure consistent quality and professional accountability
24. Why is it critical to install a vapor retarder on the warm side of a wall in cold climates before tiling? → To stop warm interior moisture from migrating into the wall cavity and condensing
25. What is the purpose of a pre-slope under a shower mortar bed? → To direct water toward the drain and prevent pooling beneath the tile
26. Which substrate requires a primer before applying adhesive? → Gypsum board
27. The TCNA designation 'EJ171' is the industry guideline document specifically addressing which installation requirement? → Movement accommodation joints (expansion joints) in tile assemblies
28. Which trowel is best for applying thinset? → Notched trowel
29. ANSI A118.4 specifies requirements for which type of tile setting material? → Latex-portland cement mortar
30. Which organization co-develops and publishes the ANSI A108 series of tile installation standards? → Tile Council of North America (TCNA)