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 is the primary purpose of back-buttering tile edges before grouting a stone installation? → To fill voids left by the notched trowel
5. What ethical consideration is most relevant to safety regulations & osha compliance in CTI practice? → Maintaining confidentiality and acting in the best interest of stakeholders
6. How should existing ceramic tile be prepared before applying a new tile installation over it? → Clean, ensure bond, fill cracks, and scarify glossy surfaces
7. A 'brick joint' or 'running bond' pattern offsets each row by what fraction of the tile length to minimize lippage on large-format tiles? → 1/4 of tile length
8. According to ANSI A118.1, what minimum tensile bond strength (in PSI) must dry-set portland cement mortar achieve after curing? → 200 PSI
9. What is a common challenge professionals face when applying quality control & inspection methods principles in Certified Tile Installer? → Balancing theoretical knowledge with practical application
10. When installing cement board over wood subfloors, which fastener pattern is required by ANSI standards? → 6 inches on edges, 12 inches in the field
11. Which quality improvement method is most applicable to safety regulations & osha compliance in Certified Tile Installer? → Plan-Do-Check-Act (PDCA) continuous improvement cycle
12. What is a dry layout? → Laying out tiles before applying adhesive
13. When planning a tile layout for a shower floor with a linear drain along one wall, the floor tiles should be: → Sloped uniformly toward the drain at 1/4 inch per foot
14. 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
15. What is the recommended minimum cure time before sealing a cementitious grout in a typical interior application? → 7 days (168 hours)
16. ISO 13006 classifies ceramic tiles primarily based on which two characteristics? → Water absorption rate and manufacturing method
17. What is the function of a non-sag or non-slump mortar additive? → To prevent tile from sliding on vertical surfaces during installation
18. What does the ANSI A118.11 standard specify? → Standard specifications for EGP (Exterior Glue Plywood) latex portland cement mortars
19. Per ANSI A108.02, what is the maximum allowable variation in floor substrate flatness for standard tile installations? → 1/4 inch in 10 feet
20. Why is a tile layout plan important? → To achieve symmetry and avoid narrow cuts
21. Which quality improvement method is most applicable to quality control & inspection methods in Certified Tile Installer? → Plan-Do-Check-Act (PDCA) continuous improvement cycle
22. What is the recommended minimum grout joint width? → 1/8 inch
23. 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
24. A glass mat gypsum backer board is best suited for which application? → Wall tile in wet areas
25. 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
26. After grouting, you notice grout haze has dried on a polished marble surface. What should you use to remove it? → A manufacturer-approved grout haze remover safe for natural stone
27. What is the correct procedure when a tile must be drilled for a plumbing fixture escutcheon? → Use a diamond-tipped hole saw at low speed with continuous water cooling
28. 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
29. What is the purpose of a waterproofing membrane? → To prevent water penetration and mold growth
30. When installing tile in a food service kitchen required to meet health codes, which grout type offers the best resistance to bacteria, chemicals, and staining? → Furan resin grout or epoxy grout