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100+ Free NV C-20 Tiling Practice Questions

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2026 Statistics

Key Facts: NV C-20 Tiling Exam

40 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

1.5 hours

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Closed Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada C-20 Tiling Contractor Examination is the official NSCB/PSI closed book exam: 40 questions, 70% (28 of 40 points), 1.5 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English and Spanish.

Sample NV C-20 Tiling Practice Questions

Try these sample questions to test your NV C-20 Tiling exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under NAC 624.370, what work does a Nevada C-20 tiling license authorize?
A.Installation of ceramic, encaustic, vitreous, and similar tile by suction and adhesives, but not hollow or structural partitioning tile
B.Structural masonry walls of hollow clay tile
C.Finish carpentry and hardwood flooring
D.Plumbing of shower valves and drain lines
Explanation: NAC 624.370 lets a C-20 contractor install ceramic, encaustic, vitreous, and other tile-like products by suction and adhesives. Hollow or structural partitioning tile is excluded. Plumbing, electrical, and major masonry stay in other Nevada classifications.
2Which ANSI specification covers general requirements for structures, substrates, and preparation before ceramic tile is installed?
A.ANSI A118.1
B.ANSI A108.01
C.ANSI A136.1
D.ANSI A108.10
Explanation: ANSI A108.01 is the general-requirements standard for structures, substrates, and tile preparation. A118.1 is a dry-set mortar material spec, A136.1 is organic adhesive, and A108.10 is grout installation. Start in A108.01 when the question is whether the backing is ready.
3A concrete slab still has a film of curing compound. What does ANSI A108.01 require before bonded thin-set tile?
A.Leave the film to keep the slab from drying under the mortar
B.Prime the film with PVA drywall primer and set tile the same day
C.Remove the curing compound so the surface is clean and free of bond-breaking coatings
D.Cover the film with unsanded grout and then thin-set
Explanation: ANSI A108.01 requires surfaces to be clean and free of wax, curing compound, oil, and other coatings. Those films are bond breakers between portland-cement mortar and concrete. Mechanical removal or another approved method is required before the bond coat goes down.
4Why is paper-faced gypsum board the wrong backing for a tiled tub surround?
A.Paper-faced gypsum is too hard for thin-set to bond
B.Paper-faced gypsum is waterproof, so a membrane cannot stick
C.ANSI A136.1 requires paper-faced gypsum behind every wet wall
D.Paper-faced gypsum deteriorates when it stays wet and is not an accepted wet-area tile backing
Explanation: Paper-faced drywall, including ordinary moisture-resistant green board, is not a substitute for cementitious backer units or another listed wet-area board. Prolonged moisture breaks down the paper and gypsum core. NTCA tub-surround training calls for CBU, fiber-cement, glass-mat, or another approved wet backing plus the waterproofing the method requires.
5A cementitious backer unit is installed on a shower wall. Why is a waterproof membrane still required by typical TCNA wet-area methods?
A.CBU panels are water-resistant tile backings, not waterproof barriers
B.CBU panels are already waterproof, so a membrane is only decorative
C.ANSI A118.9 classifies CBU as an A118.10 membrane
D.Membranes are required only on dry closet walls
Explanation: ANSI A118.9 CBU is a cementitious tile backing. It resists moisture better than drywall, but water can still pass through joints, fastener holes, and the board itself. Wet-area methods therefore add an A118.10 membrane or another specified waterproofing layer. Treating CBU as a shower pan is a common failure.
6What minimum slope do TCNA wet-area methods and plumbing practice require for a tiled shower floor toward the drain?
A.1/16 inch per foot
B.1/4 inch per foot
C.1 inch per foot
D.No slope if a waterproof membrane is used
Explanation: Shower receptors and other drained wet floors are sloped at least 1/4 inch per foot toward the drain so water leaves the surface. A membrane keeps water out of the structure, but standing water still needs slope. Prefabricated trays and mud beds must both deliver that pitch.
7Besides curing compound, which contaminants must ANSI A108.01 surfaces be free of before bonded tile?
A.Dust, oil, grease, paint, and wax
B.Only standing water; oil films may remain
C.Only laitance; paint is an approved bonding primer
D.Nothing — thin-set bonds through any film
Explanation: A108.01 requires a clean, sound substrate. Dust, oil, grease, paint, wax, and similar films prevent portland-cement mortar from bonding. Degrease, grind, or otherwise remove the contaminant until sound concrete or the specified backing is exposed.
8Why is moisture-resistant paper-faced gypsum (green board) still rejected as the sole backing in a tiled shower?
A.Green board is rated as an A118.10 waterproof membrane
B.Green board is harder than CBU and cracks every tile
C.The paper face and gypsum core still deteriorate under prolonged wet-area moisture
D.ANSI A108.11 requires green board in every shower
Explanation: Green board resists brief humidity better than standard drywall, but it is still paper-faced gypsum. NTCA tub-surround practice and TCNA wet-area methods do not treat it as a shower backing. Use CBU or another listed wet-area board and the specified waterproofing.
9Unless the mortar manufacturer states a shorter wait, how long is a new concrete slab commonly allowed to cure before bonded ceramic tile?
A.4 hours
B.28 days
C.The same day the slab is finished
D.One year in every case
Explanation: A new slab continues to shrink and give off moisture as it hydrates. Bonding tile too early increases shrinkage cracks telegraphing through the tile and moisture interfering with the mortar. Twenty-eight days is the common industry waiting period; some premium systems allow a shorter wait, but that is a manufacturer exception.
10What is laitance on a concrete slab, and why must it be removed before bonded tile?
A.A beneficial hard skin that waterproofs the slab
B.A factory-applied A118.10 waterproof membrane
C.The reinforcing wire used in an unbonded mortar bed
D.A weak surface layer of cement paste and fines that will fail in shear under the bond coat
Explanation: Laitance is a weak layer of cement paste and fines that bleeds to the concrete surface. Bonded thin-set or a bonded mortar bed is only as strong as that skin, so the weak layer is ground or shot-blasted off until sound concrete is exposed. It is not waterproofing and is not reinforcement.

About the NV C-20 Tiling Exam

The Nevada C-20 Tiling Contractor Examination is the official Nevada State Contractors Board trade examination administered by PSI Services LLC. The official exam has 40 scored questions. Passing is 70% (28 of 40 points) in 1.5 hours. The examination is closed book. Closed book. PSI lists Setting Tile, Builder's Guide to Floors, and ANSI A108/A118/A136.1:2017 as study-only references.. PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin 270, updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. PSI also offers this examination in Spanish; this bank is an English-language MCQ study adaptation, not an official translation. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Assessment

Closed Book computer-based multiple-choice. Closed book. PSI lists Setting Tile, Builder's Guide to Floors, and ANSI A108/A118/A136.1:2017 as study-only references.

Time Limit

1.5 hours

Passing Score

70% (28 of 40 points)

Exam Fee

USD 95 (PSI Services LLC (for the Nevada State Contractors Board))

NV C-20 Tiling Exam Content Outline

30%

Surface Preparation

Surface Preparation (12 items)

55%

Installation and Adhesives

Installation and Adhesives (22 items)

15%

Grout and Finishing

Grout and Finishing (6 items)

How to Pass the NV C-20 Tiling Exam

What You Need to Know

  • Passing score: 70% (28 of 40 points)
  • Assessment: Closed Book computer-based multiple-choice. Closed book. PSI lists Setting Tile, Builder's Guide to Floors, and ANSI A108/A118/A136.1:2017 as study-only references.
  • Time limit: 1.5 hours
  • Exam fee: USD 95

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NV C-20 Tiling Study Tips from Top Performers

1Distribute study time to the official bulletin 270 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada C-20 Tiling Contractor Examination?

The official PSI examination has 40 scored questions. Passing is 70% (28 of 40 points) within 1.5 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-20 exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV C-20 exam open book?

No. PSI lists this examination as closed book. Closed book. PSI lists Setting Tile, Builder's Guide to Floors, and ANSI A108/A118/A136.1:2017 as study-only references.

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.