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According to the TCNA Handbook Method F113, what is the maximum variation in flatness allowed for a floor substrate that will receive tiles with any edge 15 inches or less?

3/16 inch in 10 feet

1/4 inch in 10 feet

1/8 inch in 10 feet

1/2 inch in 10 feet

to track

2026 Statistics

Key Facts: CTI Exam

2+ yrs

Experience Required

CTEF

70%

Written Passing Score

CTEF

3 years

Credential Validity

CTEF

20-25 ft

Interior Movement Joint Spacing

TCNA EJ171

95%

Mortar Coverage for LFT

ANSI A108

33%

Max Offset for Tiles >15"

TCNA 2024

The CTI is administered by the Ceramic Tile Education Foundation (CTEF) and is the only third-party credential that verifies both tile installation knowledge and hands-on skills. Candidates must have 2+ years of documented experience and pass both a written test and a practical evaluation. The credential covers TCNA Handbook methods, ANSI A108/A118/A137 specifications, large format tile (LFT) ≥95% coverage, movement joints (EJ171), substrate preparation, and grout standards. CTI holders are preferred on commercial and high-end residential projects.

Sample CTI Practice Questions

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1According to the TCNA Handbook Method F113, what is the maximum variation in flatness allowed for a floor substrate that will receive tiles with any edge 15 inches or less?

A.3/16 inch in 10 feet

B.1/4 inch in 10 feet

C.1/8 inch in 10 feet

D.1/2 inch in 10 feet

Explanation: TCNA Method F113 specifies a maximum variation of 3/16 inch in 10 feet for floor substrates receiving tile with any edge 15 inches or less. This flatness requirement must be met before tile installation begins — correcting high and low spots is the installer's responsibility.

2When tiles have any edge longer than 15 inches, what flatness standard does the TCNA Handbook require for the substrate?

A.3/16 inch in 10 feet with no more than 1/16 inch in 12 inches

B.1/4 inch in 10 feet

C.1/8 inch in 10 feet with no more than 1/16 inch in 12 inches

D.3/8 inch in 10 feet

Explanation: For large format tiles (any edge greater than 15 inches), the TCNA Handbook tightens the flatness requirement to 1/8 inch in 10 feet and no more than 1/16 inch variation in any 12-inch span. These stricter tolerances prevent lippage, which becomes more visible and more hazardous as tile size increases.

3ANSI A118.9 governs which type of substrate board used in tile installations?

A.Gypsum wallboard

B.Cement backer board

C.Oriented strand board (OSB)

D.Fiber-reinforced gypsum board

Explanation: ANSI A118.9 establishes performance requirements for cement backer boards (also called cementitious backer units or CBUs) used as substrates for tile. It covers dimensional stability, water resistance, and bond strength characteristics required of these panels.

4Which ANSI standard covers crack isolation membranes used beneath tile installations?

A.ANSI A118.10

B.ANSI A118.12

C.ANSI A118.4

D.ANSI A108.1

Explanation: ANSI A118.12 establishes performance requirements for crack isolation membranes installed under tile. These membranes protect the tile assembly from substrate cracks up to a specified width — typically 1/8 inch — by bridging the crack rather than transmitting stress to the tile and grout.

5Which ANSI standard covers waterproofing membranes for tile assemblies in wet areas?

A.ANSI A118.6

B.ANSI A118.9

C.ANSI A118.10

D.ANSI A118.12

Explanation: ANSI A118.10 establishes performance requirements for waterproofing membranes used beneath tile in wet areas such as showers and steam rooms. Products meeting A118.10 must demonstrate zero water penetration when properly installed, protecting the structural substrate from moisture damage.

6What is the minimum mortar coverage required for large format tiles (any edge 15 inches or more) per TCNA and ANSI standards?

A.80% with no voids larger than 2 sq in

B.95% with no voids under tile edges or corners

C.75% coverage on any individual tile

D.90% overall with voids evenly distributed

Explanation: Large format tiles (any edge ≥15 inches) require a minimum 95% mortar coverage with no voids under the tile edges or corners. This requirement exists because large tiles deflect less than small tiles — an unsupported edge or corner is prone to cracking under point loads, and voids trap water in wet areas.

7What technique is most commonly used to achieve the required 95% mortar coverage when installing large format tiles?

A.Slaking the mortar for 30 minutes before use

B.Using an unmodified mortar only

C.Back-buttering the tile in addition to combing the substrate

D.Applying mortar at double the normal thickness

Explanation: Back-buttering — applying a thin skim coat of mortar to the back of the tile before setting it — combined with combing mortar onto the substrate ensures the ridges collapse and fill voids when the tile is pressed into place. This two-coat approach is the standard method for achieving the 95% coverage required for LFT.

8According to the 2024 revision to TCNA guidelines, what is the maximum offset (grout joint alignment) allowed when laying tile with any edge greater than 15 inches in a staggered pattern?

A.50% offset

B.40% offset

C.33% offset

D.25% offset

Explanation: The 2024 TCNA Handbook revision limits the offset for tiles with any edge greater than 15 inches to a maximum of 33% (one-third offset). Offsets beyond 33% on large tiles create a cantilevered condition where the tile edge is unsupported by a grout joint directly beneath the edge of the tile above, increasing lippage and crack risk.

9Which ANSI standard specifies performance requirements for unmodified (standard) portland cement mortar used in tile installations?

A.ANSI A118.4

B.ANSI A118.1

C.ANSI A118.11

D.ANSI A118.15

Explanation: ANSI A118.1 covers dry-set (unmodified) portland cement mortars for tile. These mortars contain no polymer additives and rely on cement hydration alone for bonding strength. They are suitable for many dry interior applications but generally have lower bond strength and less flexibility than polymer-modified mortars.

10Which ANSI standard applies to polymer-modified (latex-portland cement) thin-set mortars?

A.ANSI A118.1

B.ANSI A118.4

C.ANSI A118.6

D.ANSI A118.9

Explanation: ANSI A118.4 establishes performance requirements for latex-portland cement mortars (also called polymer-modified thin-sets or medium-bed mortars). These mortars include polymer additives — liquid latex or dry polymer — that improve bond strength, flexibility, and resistance to thermal movement compared to unmodified A118.1 mortars.

About the CTI Exam

The CTI (Certified Tile Installer) is the tile industry's only third-party installer assessment, combining a written knowledge test and hands-on installation skills evaluation. It is recognized by architects, contractors, and specifiers as the benchmark credential for professional tile installers.

Questions

60 scored questions

Time Limit

Written + hands-on (full day)

Passing Score

70% written + satisfactory hands-on

Exam Fee

$250 (CTEF (Ceramic Tile Education Foundation))

CTI Exam Content Outline

25%

Substrate Preparation

Flatness tolerances (F113/F115), CBU (ANSI A118.9), crack isolation (A118.12), waterproofing (A118.10), L/360 deflection

25%

Thin-Set Mortars & Installation

ANSI A118.1/A118.4/A118.11/A118.15, mortar coverage, back-buttering, open time, LFT requirements

20%

Movement Joints & Layout

TCNA EJ171, interior (20-25 ft) vs exterior (8-12 ft) spacing, inside corners, layout methods

15%

Grout

ANSI A118.6/A118.7/A118.3, sanded vs unsanded selection, epoxy grout, joint preparation

10%

Tile Materials & Standards

ANSI A137.1, water absorption classifications, rectified vs calibrated, LFT offset (≤33% for >15" edge)

CTI Program & CTEF

Assessment structure, eligibility requirements, evaluation rubric, credential maintenance

How to Pass the CTI Exam

What You Need to Know

Passing score: 70% written + satisfactory hands-on
Exam length: 60 questions
Time limit: Written + hands-on (full day)
Exam fee: $250

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CTI Study Tips from Top Performers

1Memorize the two flatness tolerances: 3/16" in 10' for tiles ≤15", and 1/8" in 10' for tiles >15"

2Know the ANSI A118 mortar standards by number: A118.1 (unmodified), A118.4 (modified/medium-bed), A118.11 (EGP/plywood), A118.15 (high-performance modified)

3Know the ANSI A118 membrane standards: A118.9 (CBU), A118.10 (waterproofing), A118.12 (crack isolation)

4Remember EJ171 spacing: 20-25 ft interior, 8-12 ft exterior, at ALL changes of plane

5For LFT: 95% coverage, back-butter, ≤33% offset, ANSI A118.15 mortar preferred

Frequently Asked Questions

What is the CTI (Certified Tile Installer) credential?

The CTI is the tile industry's only third-party assessment of tile installer competence, administered by the Ceramic Tile Education Foundation (CTEF). It consists of a written knowledge test and a hands-on tile installation skills evaluation. Both components must be passed. The CTI demonstrates that an installer has verified knowledge of TCNA Handbook methods, ANSI A108/A118/A137 specifications, and the practical skill to apply them correctly.

What are the eligibility requirements for the CTI exam?

Candidates must have a minimum of 2 years (approximately 4,000 hours) of documented, paid tile installation experience. No specific training course or union membership is required. Candidates register through CTEF's website at ceramictilefoundation.org.

What does the CTI written test cover?

The written component tests knowledge of: TCNA Handbook methods (F113, F115, F116, F125, W244, EJ171), ANSI A108/A118/A137 specifications, substrate preparation standards, thin-set mortar selection (A118.1/A118.4/A118.11/A118.15), large format tile requirements (≥95% coverage, ≤33% offset for tiles >15 inches), grout selection and application (A118.6/A118.7/A118.3), and movement joint requirements.

How long is the CTI credential valid?

The CTI credential is valid for 3 years and requires renewal through continuing education or other CTEF-approved methods. Renewal ensures CTIs stay current with updates to the TCNA Handbook and ANSI standards.

What are the TCNA movement joint requirements I need to know for the CTI?

TCNA EJ171 is the primary reference. Key rules: interior floor movement joints every 20-25 feet; exterior tile assemblies every 8-12 feet; movement joints at all changes of plane (wall-floor and wall-wall inside corners); movement joints at all structural joints; joints filled with compressible elastomeric sealant (NOT grout). Missing movement joints at inside corners is one of the most common installation errors evaluated in the hands-on assessment.

What large format tile (LFT) rules are covered on the CTI?

For tiles with any edge ≥15 inches: substrate flatness must be 1/8 inch in 10 feet (not the standard 3/16 inch); minimum 95% mortar coverage with no voids at edges or corners (vs. 80% for standard tile); back-buttering required to achieve coverage; maximum offset of 33% for staggered patterns (2024 TCNA revision — 50% offset no longer permitted for LFT). Use ANSI A118.4 or A118.15 mortar for LFT applications.