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Key Facts: ACT Mud Walls Exam
25
Multiple-Choice Written Questions
ACT Consortium
84%
Written Passing Score
ACT Consortium
85%
Field Test Passing Score
ACT Consortium
2.5 lb
Min Metal Lath (per sq yd)
ANSI A108
3/4 in
Typical Total Bed Thickness
TCNA W201
20-25 ft
Interior Movement-Joint Spacing
TCNA EJ171
1/4 in / 10 ft
Standard Tile Flatness Tolerance
ANSI A108
ACT Mortar (Mud) Walls is administered by the Advanced Certifications for Tile Installers (ACT) Consortium, made up of CTEF, IMI, TCAA, NTCA, and TCNA. Candidates must first hold an active CTEF Certified Tile Installer (CTI) credential or be a journeyman tile setter through the IUBAC apprenticeship. The exam has a 25-question multiple-choice written portion (84% passing) and a hands-on field test (85% passing) graded by trained third-party evaluators. The certification covers TCNA Handbook wall methods W201/W202/W221/W222 and W244, ANSI A108.1A installation, EJ171 movement joints, expanded metal lath selection and fastening, Portland cement scratch and brown coats, latex-modified mortar admixtures, plumb/flatness tolerances (1/4 in/10 ft standard, 1/8 in/10 ft for tiles greater than 15 in), and bond-coat/tile installation over the cured bed.
Sample ACT Mud Walls Practice Questions
Try these sample questions to test your ACT Mud Walls exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which TCNA Handbook method covers tile installation over a Portland cement plaster scratch and brown coat applied to metal lath on a wall?
2Why is a cleavage membrane installed behind metal lath in TCNA Method W201?
3TCNA Method W221 is selected when the existing wall substrate is which of the following?
4An installer applies a Portland cement plaster scratch and brown coat directly over moisture-resistant gypsum board to true a wall before tile. Which TCNA wall method describes this assembly?
5Which of the following is the most accurate description of TCNA Method W244C?
6In TCNA W201, the metal lath is installed so that the cups (open mesh openings) face which direction on a wall?
7What is the minimum expanded metal lath weight specified for wall mortar bed applications under TCNA wall methods?
8When using 2.5 lb expanded diamond-mesh lath on a wall under TCNA W201, which fastener spacing along studs is most appropriate?
9On a wood-stud wall under TCNA W201, what minimum penetration into the framing should each lath fastener achieve?
10Behind the metal lath in TCNA W201, the installer must place a continuous moisture-control layer. Which material is most commonly specified?
About the ACT Mud Walls Exam
ACT Mortar (Mud) Walls certifies tile installers who can properly float a wall mortar bed - the traditional Portland cement scratch-and-brown thick-set assembly over metal lath used to bring out-of-plumb or out-of-flat walls into tile-installation tolerance. The credential combines a 25-question multiple-choice written test on TCNA Handbook methods (W201, W221, W222, W244, EJ171) and a hands-on field test in which a third-party evaluator grades the installer building a wall mortar bed.
Questions
25 scored questions
Time Limit
Half/full-day field test
Passing Score
84%/85%
Exam Fee
Contact CTEF/IMI (ACT Consortium (CTEF + IMI + TCAA + NTCA + TCNA))
ACT Mud Walls Exam Content Outline
TCNA Wall Methods (W201, W221, W222, W244)
Selection between full thick-set over lath (W201), thick correction (W221), single-coat correction (W222), and thin-set over CBU (W244)
Lath Types & Fastening
2.5/3.4 lb expanded diamond mesh, galvanized, self-furring, fastener spacing on studs, 3-strand engagement, 3/4 in penetration, vapor barrier behind lath
Mortar Mix
Portland cement scratch and brown coats (1:3 to 1:5), Type S, ASTM C144 sand, latex/polymer additives, ANSI A118.1 bond coat
Scratch & Brown Coat
Scratch coat ~3/8 in combed horizontally, brown coat to ~3/4 in total bed at ~5/8 in lifts, partial cure between coats, sponge-float surface
Plumb & Flatness Tolerances
1/4 in/10 ft standard tile, 1/8 in/10 ft + 1/16 in/12 in for tiles greater than 15 in, framing trigger ~1/4 in in 8 ft
Movement Joints (EJ171)
Interior 20-25 ft, exterior 8-12 ft, perimeter and all changes of plane, 1/8 in min width, ASTM C920 sealant
Tile Installation Over Float
Bond coat A118.1/A118.4/A118.15, 95% LFT coverage, back-buttering, beat-in, notch direction, 33% LFT offset
How to Pass the ACT Mud Walls Exam
What You Need to Know
- Passing score: 84%/85%
- Exam length: 25 questions
- Time limit: Half/full-day field test
- 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 Mud Walls Study Tips from Top Performers
Frequently Asked Questions
What is the ACT Mortar (Mud) Walls certification?
ACT Mortar (Mud) Walls is one of the Advanced Certifications for Tile Installers (ACT) administered by the ACT Consortium (CTEF + IMI + TCAA + NTCA + TCNA). It certifies installers who can properly float a wall - that is, build a Portland cement scratch-and-brown mortar bed over metal lath (TCNA W201) and correct out-of-plumb or out-of-flat substrates with thicker or single-coat float methods (W221/W222). The credential consists of a 25-question multiple-choice written test and a hands-on field test graded by a trained third-party evaluator.
What are the prerequisites for ACT Mud Walls?
Candidates must first hold an active CTEF Certified Tile Installer (CTI) credential, or be a journeyman tile setter through the International Union of Bricklayers and Allied Craftworkers (IUBAC) apprenticeship training program. State licensing or manufacturer training alone does not satisfy the ACT prerequisite.
What is the passing score for ACT Mud Walls?
The written test passing score is commonly cited as 84%, and the hands-on field test passing score as 85%. Both components must be passed independently to receive the certification.
What does the ACT Mud Walls written test cover?
The 25-question multiple-choice test covers TCNA Handbook wall methods (W201, W202, W221, W222, W244 series), ANSI A108.1A installation with Portland cement mortar, EJ171 movement joints (interior 20-25 ft, exterior 8-12 ft, all changes of plane), expanded metal lath selection (2.5/3.4 lb diamond mesh, galvanized, self-furring) and fastening, vapor barrier installation behind lath, Portland cement scratch and brown coat proportions and thickness, plumb/flatness tolerances, bond coat selection (A118.1/A118.4/A118.15), and large-format tile coverage (95%) and offset (33%) requirements.
What does the ACT Mud Walls hands-on field test cover?
Candidates build a wall mortar bed on a mock-up at an ACT-accredited site under a trained third-party evaluator. The evaluator grades vapor barrier and lath installation (cups up, fastener spacing, lap, 3-strand engagement, 3/4 in penetration), scratch coat application and horizontal combing, brown coat thickness and plumb/flatness against screed rails, surface texture for bond coat, movement joint placement, and bond coat coverage on a sample tile lift-and-inspect.
How do I register for the ACT Mud Walls exam?
Contact the Ceramic Tile Education Foundation (CTEF) at 864-222-2131 or visit tilecertifications.com to schedule with an ACT-accredited site. IUBAC members can register through the International Masonry Institute (Teri Indelli, 630-396-3144). The exam is offered in-person only; there is no remote-testing option.