100+ Free ACT Large Format Tile Practice Questions
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Key Facts: ACT Large Format Tile Exam
25
Written Exam Questions
ACT Large Format Tile
84% / 85%
Passing Scores (Written / Hands-On)
ACT Large Format Tile
≥15"
LFT Threshold (any edge)
ANSI A108 / TCNA Handbook
1/8" in 10'
LFT Substrate Flatness
ANSI A108.19
95% / 80%
Mortar Coverage (wet-exterior / dry-interior)
ANSI A108 / TCNA Handbook
CTI or IUBAC
Prerequisite
ACT Consortium
ACT Large Format Tile & Substrate Preparation is an assessment-only credential — there is no training course, only a 25-question multiple-choice written test (84% to pass) and a hands-on field installation (85% to pass), administered by the ACT consortium (CTEF, TCNA, IMI, IUBAC, NTCA, TCAA). Candidates must already hold the CTEF Certified Tile Installer (CTI) credential or be an IUBAC journeyman tile setter before scheduling. Master the LFT definition (any tile ≥15" on one edge), the stricter 1/8"-in-10' substrate flatness tolerance, ANSI A118.4T large-and-heavy-tile mortars, 95% mortar coverage in wet/exterior areas (80% dry interior), back-buttering, TCNA EJ171 movement-joint spacing (interior 20-25 ft, exterior 8-12 ft), and ANSI A108.02 lippage control.
Sample ACT Large Format Tile Practice Questions
Try these sample questions to test your ACT Large Format Tile exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Under current ANSI and TCNA Handbook definitions, a tile is classified as 'large format tile' (LFT) when it has at least one edge of what minimum length?
2Which ANSI installation standard specifically addresses the installation of large-and-heavy tile (LFT)?
3For a tile with any edge 15 inches or longer, what is the maximum allowable substrate variation from the required plane over a 10-foot span?
4For tile installations where every edge of the tile is less than 15 inches, what substrate flatness tolerance applies?
5For LFT substrates, the standard also restricts deviation in a shorter span. Within 24 inches the substrate cannot be more than how much out of plane?
6Which ANSI mortar standard identifies a 'large-and-heavy-tile' (LHT/LFT) mortar with non-sag and extended open-time characteristics?
7In a dry interior residential installation, what is the minimum mortar contact area required on the back of LFT?
8In wet areas (shower walls, pools) and all exterior installations, what minimum mortar coverage applies under LFT?
9What technique is normally required on the back of LFT to consistently achieve 95%/80% mortar coverage?
10Under TCNA EJ171, what is the maximum spacing of intermediate movement joints in an interior tile assembly with normal temperature and moisture exposure?
About the ACT Large Format Tile Exam
The ACT (Advanced Certifications for Tile Installers) Large Format Tile & Substrate Preparation credential is an assessment-only program for journeyman-level tile installers. It verifies that the candidate can install large format tile (any tile with at least one edge 15 inches or longer) to ANSI A108.19 and TCNA Handbook standards, including the stricter 1/8-inch-in-10-feet substrate flatness tolerance, ANSI A118.4T large-and-heavy-tile mortars, 95% mortar coverage in wet/exterior areas (80% dry interior), TCNA EJ171 movement joints, and lippage control per ANSI A108.02. Candidates must already hold a CTEF Certified Tile Installer (CTI) credential or be an IUBAC journeyman tile setter; ACT does not provide training, only assessment.
Assessment
25-question multiple-choice written exam plus a supervised hands-on field test installing large format tile to ACT scoring criteria
Time Limit
Half/full-day field test
Passing Score
84% written + 85% hands-on
Exam Fee
Contact CTEF/IMI for current fee (ACT Consortium (CTEF/TCNA/IMI/IUBAC/NTCA/TCAA))
ACT Large Format Tile Exam Content Outline
LFT Definition & ANSI Standards
ANSI's 15-inch large-format threshold (any tile with at least one edge ≥15"), ANSI A108.19 installation standard for large heavy tile, TCNA Handbook LFT methods, and the broader ANSI A108/A118/A136.1 family
Substrate Flatness & Preparation
1/8" in 10' and 1/16" in 24" flatness requirement for tile with any edge ≥15", 1/4" in 10' for smaller tile, self-leveling underlayments, deflection L/360, and the difference between flatness and levelness
Mortar Selection
ANSI A118.4T large-and-heavy-tile mortars (non-sag, extended open time), modified vs unmodified, polymer-modified mortars, ANSI A118.15 improved modified, and product selection by service environment
Mortar Coverage & Application
95% contact in wet areas and exterior, 80% contact in dry interior, back-buttering (flat back-trowel) for LFT and ribbed-back tile, directional troweling, beat-in, and inspecting coverage by pulling a tile
Layout
Dry layout, cut sizes never less than 1/3 of the tile (TCNA Handbook), control-joint planning aligned to substrate joints, and balancing aesthetic with EJ171 requirements
Movement Joints (EJ171)
Perimeter joints at restraining surfaces, intermediate field joints (interior 20-25 ft maximum, exterior 8-12 ft, more frequent in moisture/direct sun), minimum 1/8" width, ASTM C920 sealants, sealant-only at perimeter
Lippage Control
ANSI A108.02 lippage allowances by grout-joint width (1/32" + inherent warpage for 1/16" to <1/4" joints; 1/16" + warpage for ≥1/4" joints), leveling clip systems, beat block technique, and tile warpage limits
How to Pass the ACT Large Format Tile Exam
What You Need to Know
- Passing score: 84% written + 85% hands-on
- Assessment: 25-question multiple-choice written exam plus a supervised hands-on field test installing large format tile to ACT scoring criteria
- Time limit: Half/full-day field test
- Exam fee: Contact CTEF/IMI for current fee
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
ACT Large Format Tile Study Tips from Top Performers
Frequently Asked Questions
What qualifies as Large Format Tile (LFT) under ANSI?
Under ANSI A108 and the TCNA Handbook, large format tile is any tile with at least one edge 15 inches or longer. The 15-inch threshold triggers the stricter 1/8-inch-in-10-feet substrate flatness tolerance (compared with 1/4-inch-in-10-feet for smaller tile), the use of an ANSI A118.4T large-and-heavy-tile mortar, and special attention to back-buttering and lippage. Tiles below 15 inches on every edge follow standard ANSI A108 installation methods.
What is the substrate flatness requirement for LFT?
For tile with any edge 15 inches or longer, the substrate must not vary more than 1/8 inch in 10 feet, and not more than 1/16 inch in 24 inches, from the required plane. Tile with all edges under 15 inches uses the older 1/4 inch in 10 feet tolerance. Achieving the LFT tolerance typically requires a self-leveling underlayment, patching compound, or a thick-bed mortar setting method.
What mortar coverage does ACT require?
Per ANSI A108 and the TCNA Handbook, mortar coverage under tile must be 95% in wet areas and exterior installations and 80% in dry interior installations. Coverage is measured by removing at least three tiles or tile assemblies after sufficient cure and verifying the back-of-tile contact area. Edges and corners must be fully supported in every environment.
What does ANSI A118.4T identify?
ANSI A118.4T is the standard for large-and-heavy-tile mortars (sometimes called LHT or LFT mortars). These are modified thinset mortars with non-sag (T) and extended-open-time properties that hold LFT in plane without slumping on walls and provide deep enough trowel ridges to collapse fully under a heavy tile, supporting the 95%/80% coverage targets.
What movement-joint spacing does TCNA EJ171 require?
EJ171 requires movement joints in interior tile assemblies at a maximum of 20 to 25 feet in each direction, and at 8 to 12 feet in exterior assemblies or where direct sun or moisture exposure is significant. Perimeter joints are required wherever tilework abuts restraining surfaces (walls, columns, dissimilar finishes). Joints must be at least 1/8 inch wide and filled with an ASTM C920 elastomeric sealant.
Is ACT Large Format Tile an assessment-only credential?
Yes. ACT (Advanced Certifications for Tile Installers) is assessment-only — the consortium does not provide training. Candidates prepare through their CTI training, IUBAC apprenticeship, manufacturer training, NTCA Reference Manual, and the TCNA Handbook, then schedule the 25-question written exam and the hands-on field test through an ACT-accredited test site.