100+ Free ACT Mud Floors Practice Questions
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How is the correct water content of deck mud judged in the field?
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Key Facts: ACT Mud Floors Exam
25 MC
Written Exam Questions
ACT Consortium
84% / 85%
Written / Hands-on Passing
ACT Consortium
1:5
Deck Mud Cement-to-Sand
ANSI A108.1A
1-1/4 to 2 in
Unbonded Mortar Bed
TCNA F112/F121
1/4 in/ft
Min Slope to Drain
TCNA Handbook
100 Q
Practice Questions
OpenExamPrep
ACT Mortar (Mud) Floors validates that a CTI or IUBAC journeyman can correctly float an unbonded mortar bed: 4-mil poly cleavage membrane, 2x2 16-gauge WWF reinforcement, deck mud at 1:5 cement-to-sand, 1-1/4 in to 2 in thickness, 1/4 in per foot slope to drain, long straight-edge screeding with wood float and steel trowel, perimeter and field movement joints per TCNA EJ171, and 24-72 hour cure before tile-setting. Two-test format: 25-question written (84% pass) plus a field test (85% pass).
Sample ACT Mud Floors Practice Questions
Try these sample questions to test your ACT Mud Floors 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 describes an unbonded (floating) mortar bed over a concrete substrate for interior floor tile without a topical waterproof membrane?
2Which TCNA method adds a waterproof membrane to the unbonded mortar bed assembly over a concrete substrate?
3What is the primary purpose of a cleavage membrane in an unbonded mortar bed assembly?
4Which material is most commonly specified as a cleavage membrane in a TCNA F112 unbonded mortar bed?
5Which reinforcement is specified within an unbonded mortar bed per TCNA F112?
6Which TCNA Handbook method places thinset over a waterproof or anti-fracture membrane on a concrete slab — not a floated mortar bed?
7Which TCNA method is used where crack suppression must be provided only over existing in-plane cracks, not the entire floor area?
8On an F112 unbonded mortar bed, where is the 2x2 wire reinforcement placed within the bed cross-section?
9Which of the following best describes "unbonded" in the context of TCNA F112?
10When is TCNA F121 (unbonded bed with waterproof membrane) preferred over F112?
About the ACT Mud Floors Exam
The ACT Mortar (Mud) Floors credential certifies a tile installer's ability to design and float a thick mortar bed for floor tile in accordance with TCNA Handbook methods (F112, F121, F122, F125) and ANSI A108.1A/A108.1B. The certification combines a 25-question written exam (84% to pass) with a field test scored by trained third-party evaluators (85% to pass). Candidates must hold a current CTI from CTEF or have completed IUBAC journeyman apprenticeship.
Questions
25 scored questions
Time Limit
Half/full-day field test
Passing Score
84% written + 85% hands-on
Exam Fee
Contact CTEF/IMI (ACT Consortium (CTEF/TCNA/IMI/IUBAC/NTCA/TCAA))
ACT Mud Floors Exam Content Outline
Floating Mortar Bed Methods
TCNA F112 (unbonded mortar bed on concrete), F121 (with waterproof membrane), F122 (anti-fracture membrane), F125/F125A (crack-isolation membrane), cleavage membrane principle
Mortar Mix Design
Deck-mud 1:5 cement-to-sand, sharp/concrete sand, water content (compressed-handful), latex-modified admixtures per ANSI A118.4/A108.1B
Substrate Preparation
4-mil polyethylene cleavage membrane, 2x2 16-gauge WWF or galvanized lath reinforcement, perimeter expansion, ANSI A108 prep tolerances
Floating Thickness
1-1/4 in minimum to 2 in maximum unbonded mortar bed, slope tolerance for drains
Screeding & Finishing
Long straight-edge screeding, wood float vs. steel trowel, mortar slick bond coat, surface tolerance 1/4 in / 10 ft
Slope & Drainage
1/4 in / ft minimum slope to drain, double-slope shower receptor with pre-pan, two-stage drain weep-hole protection
Movement Joints & Curing
TCNA EJ171 perimeter and field joints, 1/8 in min width, ASTM C920 sealant, 24-72 hr mortar bed cure
How to Pass the ACT Mud Floors Exam
What You Need to Know
- Passing score: 84% written + 85% hands-on
- 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 Floors Study Tips from Top Performers
Frequently Asked Questions
What is the ACT Mortar (Mud) Floors credential?
ACT Mortar (Mud) Floors is one of the Advanced Certifications for Tile Installers offered by the ACT Consortium (CTEF, TCNA, IMI, IUBAC, NTCA, TCAA). It certifies that a tile installer can correctly design and float a thick mortar bed for floor tile per TCNA Handbook methods and ANSI specifications. The credential consists of a 25-question written exam (84% to pass) plus a field test scored by trained third-party evaluators (85% to pass).
What is the difference between TCNA F112 and F121?
Both are unbonded (floating) mortar bed methods over a concrete substrate, separated from the slab by a cleavage membrane and reinforced with 2x2 wire mesh. F112 is the basic interior floor method (no topical waterproof membrane). F121 places a waterproof membrane between the cleavage membrane and the slab — used where moisture from above must be contained or where the substrate could contribute moisture. The mortar bed thickness rule (1-1/4 in minimum to 2 in maximum) is the same for both.
What sand and cement ratio is used for deck mud?
ANSI A108.1A specifies one part Portland cement to five parts damp sand by volume (1:5). Sharp "concrete" sand (also called torpedo sand) is preferred over fine masonry sand because it interlocks better. The mix is dry-pack consistency — just enough water that a compressed handful holds together with no visible free water. Some installers use 4:1 for a richer bond but 5:1 is the published standard.
Why use a cleavage membrane under a mortar bed?
A cleavage membrane (typically 4-mil polyethylene or 15-pound roofing felt) breaks the bond between the mortar bed and the substrate, allowing the bed to "float" independently. If the slab cracks or moves, the mortar bed and the tile above it are isolated from that movement. The membrane also prevents the substrate from absorbing water from the fresh mortar, which would weaken the bed.
What slope is required from perimeter to drain?
TCNA specifies 1/4 in per foot (about 2% or 1:48) minimum slope from the perimeter walls to the drain. For shower receptors, the double-slope approach applies: the pre-pan mortar bed beneath the waterproof pan membrane is sloped 1/4 in / ft, and the top mortar bed above the pan is also sloped 1/4 in / ft. The two stages give the waterproof membrane positive slope to the drain weep holes.
How long should a mortar bed cure before tile is set?
The mortar bed typically requires 24 to 72 hours of cure before tile is bonded to it, depending on bed thickness, mortar type, ambient temperature, and humidity. The bed must be hard enough to walk on without indentation, and surface moisture should have dissipated to a saturated-surface-dry condition. Latex-modified beds may need longer dry-back time before bonding because the latex retards surface moisture loss.