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Under ANSI A137.3, what is the minimum side dimension that qualifies a porcelain tile as a 'gauged porcelain tile' (GPT)?
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Key Facts: ACT GPT Exam
25 MC
Written Questions
ACT Consortium
84% / 85%
Pass Score (written / hands-on)
ACT Consortium
95%
Min Mortar Coverage
ANSI A108.19
1/8" in 10'
Substrate Flatness (GPT panels)
ANSI A108.19
1/16" in 24"
Local Flatness (GPT panels)
ANSI A108.19
CTI required
Prerequisite
ACT Consortium
ACT GPT verifies that an experienced tile installer can install thin gauged porcelain tile and large-format panels/slabs to the ANSI A137.3 / A108.19 standards. Candidates must hold an active CTI or be a journeyman through IUBAC. The exam evaluates safe handling with suction frames, substrate prep to tighter tolerances (1/8" in 10' with 1/16" in 24"), mortar selection (ANSI A118.15 / A118.4T), 95% mortar coverage with back-buttering and beat-in technique, tile leveling systems for lippage, and TCNA EJ171 movement joints. Passing requires 84% written and 85% on the hands-on practical.
Sample ACT GPT Practice Questions
Try these sample questions to test your ACT GPT exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which ANSI standard establishes the material specification for gauged porcelain tile and gauged porcelain tile panels/slabs?
2Which ANSI installation standard specifically governs interior installation of gauged porcelain tile and gauged porcelain tile panels/slabs?
3Under ANSI A137.3, what is the minimum side dimension that qualifies a porcelain tile as a 'gauged porcelain tile' (GPT)?
4Which thickness range corresponds to thin gauged porcelain tile (GPT) as defined in ANSI A137.3 Table 4?
5Under ANSI A108.19, the 3.5-4.9 mm gauge range of thin GPT is NOT allowed for which installation?
6How does ANSI A137.3 define a gauged porcelain tile panel/slab (GPTP/S) in terms of size?
7Which characteristic distinguishes 20 mm thick gauged porcelain panels from thinner panels in terms of typical application?
8Why is back-mesh reinforcement frequently applied to thin GPT and gauged porcelain panels?
9Why is porcelain's low water absorption (≤0.5%) a critical factor when selecting bonding mortar for GPT?
10Which document is the primary U.S. industry reference for ceramic, glass, and stone tile installation methods including GPT?
About the ACT GPT Exam
The ACT Gauged Porcelain Tile (GPT) credential is an Advanced Certification for Tile Installers covering both gauged porcelain tile (one or more sides ≥1 m) and gauged porcelain tile panels/slabs (>24" × 48"). It requires an active CTI or IUBAC journeyman status as a prerequisite and includes a 25-question written test plus a hands-on installation skills evaluation.
Questions
25 scored questions
Time Limit
Half/full-day (written + hands-on)
Passing Score
84% written / 85% hands-on
Exam Fee
Contact CTEF/IMI (ACT Consortium (CTEF + IMI + NTCA + TCAA + TILE))
ACT GPT Exam Content Outline
GPT Definitions & ANSI A108.19
Gauged porcelain tile vs panels/slabs, thickness ranges (3.5-6.5mm, 12mm, 20mm), Table 4/Table 5 classifications under ANSI A137.3
Handling & Transport
Suction frames, vacuum cup placement, A-frame transport, multi-person lifts, edge protection, panel rotation
Substrate Flatness & Prep
1/8 inch in 10 feet AND 1/16 inch in 24 inches for GPT panels, self-leveling underlayment (SLU), substrate primers
Mortar Selection
ANSI A118.15 high-performance modified, A118.4T large-and-heavy-tile mortar, polymer-modified mortars for vitrified tile bodies
Mortar Coverage & Application
≥95% coverage minimum, parallel troweling on substrate AND panel back (back-buttering), beat-in with rubber float, voids <2 sq in
Lippage Management
Tile leveling systems (clips/wedges/spinners), suction-cup lifters for re-positioning within open time
Movement Joints
TCNA EJ171 spacing, perimeter expansion, field joints every 8-12 ft exterior / 20-25 ft interior, soft joints at all changes of plane
How to Pass the ACT GPT Exam
What You Need to Know
- Passing score: 84% written / 85% hands-on
- Exam length: 25 questions
- Time limit: Half/full-day (written + hands-on)
- Exam fee: Contact CTEF/IMI
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 GPT Study Tips from Top Performers
Frequently Asked Questions
What is the ACT Gauged Porcelain Tile credential?
The ACT Gauged Porcelain Tile (GPT) certification is an Advanced Certification for Tile Installers administered by the ACT consortium (CTEF, IMI, NTCA, TCAA, TILE). It validates an installer's ability to handle and install both gauged porcelain tile (one side ≥1 m) and gauged porcelain tile panels/slabs (typically >24" × 48") in accordance with ANSI A137.3 and A108.19. The credential requires both a 25-question written test (84% pass) and a hands-on skills evaluation (85% pass).
What is the prerequisite to take the ACT GPT exam?
Candidates must either hold an active CTI (Certified Tile Installer) credential from CTEF, or be a journeyman tile setter through the IUBAC (International Union of Bricklayers and Allied Craftworkers) apprenticeship program. The ACT GPT is an advanced certification — it builds on the foundational tile installation knowledge verified by CTI or union journeyman status.
What does the ACT GPT exam cover?
The written component covers ANSI A137.3 (material standard for gauged porcelain), ANSI A108.19 (installation standard), TCNA Handbook methods for GPT, substrate flatness (1/8" in 10' with 1/16" in 24"), mortar selection (A118.15, A118.4T), 95% coverage with back-buttering, tile leveling systems, and movement joints (EJ171). The hands-on test evaluates safe handling with suction frames, parallel troweling, beat-in technique, and lippage control.
What is the difference between gauged porcelain tile and gauged porcelain panels/slabs?
Under ANSI A137.3, a gauged porcelain tile (GPT) has at least one side ≥1 meter and a thickness of 3.5-6.5 mm. A gauged porcelain tile panel/slab (GPTP/S) typically exceeds 24" × 48" with thicknesses ranging from 3.5 mm to 20 mm. Both share the same installation methods under A108.19, but panels/slabs require larger suction frames, multi-person lifts, and A-frame transport due to their size.
What mortar coverage is required for GPT installations?
ANSI A108.19 requires a minimum of 95% mortar coverage for floors, exteriors, and wet areas, with no voids greater than 2 square inches and full support at all corners and edges. Achieving this requires parallel troweling on both the substrate and the back of the panel (back-buttering), using a properly sized notched trowel, and beating the panel in with a rubber float. Coverage on interior dry walls may use 80% as a minimum but 95% is best practice for panels.
Which mortars are appropriate for gauged porcelain panels?
ANSI A118.15 high-performance modified thin-set mortar is the preferred choice for gauged porcelain panels because porcelain bodies are vitrified and low-absorption, demanding higher bond strength and polymer modification. ANSI A118.4T (large-and-heavy-tile mortar — the non-sag/non-slip variant) is also acceptable, particularly on walls. Standard A118.1 unmodified mortar is generally NOT recommended for GPT panels.