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C 54 EXAM 2025 | CERAMIC AND MOSAIC TILE
CONTRACTORS LICENSE EXAM | ALL QUESTIONS
AND CORRECT ANSWERS | GRADED A+ | VERIFIED
ANSWERS | LATEST EXAM
In preparing to reinstall tile, you find that one of the old tile from a concrete block wall is still attached to it. This tells you that: ---------CORRECT ANSWER-----------------it had a good bond When using glass mesh sheeting, what is NOT true? ---------CORRECT ANSWER-----------------Use neither diamond mesh nor 3/8" rib lath When using glass mesh sheeting, what is NOT true? ---------CORRECT ANSWER-----------------Adhesive mastic may be used on top of the sheeting. Under tile on countertops, what type of support can be used? --------- CORRECT ANSWER-----------------1"x6" boards, 1/4 inch apart For the extension of a pool, what type of cement should be used? --------- CORRECT ANSWER-----------------Туре I Which of the following is true when you use Portland cement grouting? ----- ----CORRECT ANSWER-----------------should be mixed thoroughly and allowed to hydrate
How should ceramic veneer tile be prepared because of its porosity? --------
- CORRECT ANSWER-----------------Soaked thoroughly in water Which of the following tools is NOT used with a butter board? --------- CORRECT ANSWER-----------------feature strip How long should tile be out of water before they are set? ---------CORRECT ANSWER-----------------10 minutes Mortar properly applied to a ceiling is floated: ---------CORRECT ANSWER- ----------------in thin coats When a ceiling is floated in two coats, how long should the tilesetter wait before applying the second coat? ---------CORRECT ANSWER----------------- over night Glazed tile for ceiling work should be: ---------CORRECT ANSWER----------- ------Allowed to soak at least 1/2 hour The correct thickness for the pure coat is: ---------CORRECT ANSWER------ -----------1/16 inch What condition should glazed wall tile be just before application to the ceiling? ---------CORRECT ANSWER-----------------thoroughly soaked but free to excess water
For countertops, what mortar mix ratio should be used? ---------CORRECT ANSWER-----------------1:5 a part portland cement, 5 parts washed sand For countertops, what mortar mix ratio should be used? ---------CORRECT ANSWER-----------------beating block What is the joint size for a tile 2-3/16 inch square or smaller? --------- CORRECT ANSWER-----------------1/16 to 1/8 inch The correct treatment when installing mortar felt behind the counter for a back splash is: ---------CORRECT ANSWER-----------------fold tightly into corners One of the following materials is NOT acceptable or proper as a surface for mud: ---------CORRECT ANSWER-----------------3/4 inch exterior grade plywood with dot & dasb saw cuts 6" o.c How is the bond tested, after placing tile over thin-set? ---------CORRECT ANSWER-----------------when bringing up tile, thin-set and mortar should come up along with it What is NOT true regarding a door threshold (or jamb)? ---------CORRECT ANSWER-----------------They are all made the same
What is the recommended gage of metal stud, when gypsum or green board is screwed to the stud, and ceramic tile installed with organic adhesive on interior walls? ---------CORRECT ANSWER----------------- 25 What is the recommended gage of metal stud when gypsum or green board is screwed to the stud, and ceramic tile installed with cement mortar on interior walls? ---------CORRECT ANSWER----------------- 20 Tile are evaluated with a uniform testing criteria. The tests are composed of: ---------CORRECT ANSWER-----------------non-destructive procedures and weight classification The destructive tests require the tile be tested for: ---------CORRECT ANSWER-----------------water absorption and crazing, thermal shock and bond strength and breaking strength and abrasive hardness Unglazed ceramic mosaic tiles are formed by either the dust-pressed or plastic method and are usually (-) inch to (-) inch thick. ---------CORRECT ANSWER-----------------1/4, 1/ Unglazed ceramic mosaic tile is required to either (-) or (-) --------- CORRECT ANSWER-----------------Impervious, vitreous Impervious requires a water absorption of not more than: ---------CORRECT ANSWER-----------------0.5%
Used with the spirit level to plumb and level float strips is the: --------- CORRECT ANSWER-----------------straight edge To butter the largest tiles, the trowel to use is: ---------CORRECT ANSWER- ----------------brick trowel To help establish the plane of a setting bed, the tilesetter uses a: --------- CORRECT ANSWER-----------------floating strip The rectangular trowel used by a tilesetter is: ---------CORRECT ANSWER- ----------------float trowel Which one of the following tools is preferred by tilesetters as an aid in erecting perpendicular lines in connection with laying tile floors? --------- CORRECT ANSWER-----------------Trammel bar Spots of mortar on a large floor are set, level by use of a: ---------CORRECT ANSWER-----------------water level When a quarry floor is set without legs, the tile- setter works within areas that are set how far apart? ---------CORRECT ANSWER-----------------3 rows
When a floor is set without legs, the chalk line is generally placed parallel to the longest wall and how far from it? ---------CORRECT ANSWER------------- ----one tile away Mortar for quarry tiles should be cement dusted: ---------CORRECT ANSWER-----------------heavily What do you use on steel plate to form a bond with the mortar setting bed? ---------CORRECT ANSWER-----------------shrinkage mesh What should be applied to a concrete surface immediately before it receives the mortar setting bed? ---------CORRECT ANSWER----------------- water and cement Shrinkage mesh is lapped a minimum of how much over steel plate? --------
- CORRECT ANSWER-----------------one mesh Shrinkage mesh over steel plate is laced with tie wire of how much spacing? ---------CORRECT ANSWER-----------------12 inches on center How much should shrinkage mesh be turned up at its junction with vertical walls? ---------CORRECT ANSWER-----------------попe What is used to insure the stability of concrete fill over the structural subfloor? ---------CORRECT ANSWER-----------------Shrinkage mesh
To make chipping hammers, chisels, and drill bits more durable, they are capped with: ---------CORRECT ANSWER-----------------tungsten carbide The tilesetter uses what tool to help establish the plane of the setting bed? ---------CORRECT ANSWER-----------------floating strip For smoothing small irregularities left on the mortar bed, the tilesetter may use a: ---------CORRECT ANSWER-----------------wood float For grout to meet normal wear conditions, it should be: ---------CORRECT ANSWER-----------------hard and dense The grouts that are recommended for use as both bond coat and grout for tile work in food and beverage plants are the: ---------CORRECT ANSWER- ----------------resin base When concrete fill is put over a structural sub- floor, what is used to insure its stability? ---------CORRECT ANSWER-----------------shrinkage mesh A 90° corner is specified when installing a sink, the deck lath should be held away from the wall: ---------CORRECT ANSWER-----------------1 inches A tile cove is specified when installing a sink, the deck lath should be held away from the wall: ---------CORRECT ANSWER-----------------3 inches
A 90° corner is specified when installing a sink, the cabinet should be (- )wider than the sink from front to back. ---------CORRECT ANSWER---------- -------2 inches A tile cove is specified when installing a sink, the cabinet should be (-) wider than the sink from front ---------CORRECT ANSWER----------------- 4 inches The layout should start with (-) , on a straight- run drain board with a diagonal deck: ---------CORRECT ANSWER-----------------Full diagonals at the cap and at the sink On a straight-run drainboard with a straight deck, layout should start with: -- -------CORRECT ANSWER-----------------a full tile on the cap When installing a Pullman without using trim shapes, how large of a joint should be left around it? ---------CORRECT ANSWER-----------------1/16 inch The V-cap is (-) backed with mortar. ---------CORRECT ANSWER------------- ----fully What is the maximum depth of the mortar, when using a V-cap apron? ------ ---CORRECT ANSWER-----------------1 inch
You have two apprentices to clean a tile floor; one has an acid product and the other has a stiff brush.You should tell them: ---------CORRECT ANSWER-----------------to use neutral soap What do you NOT do when you are in charge of cleaning on a tile floor job? ---------CORRECT ANSWER-----------------as floor is being tiled, stack all items in a neat pile Mike had a concrete floor that he wanted to tile. He cleaned the floor and laid tile with thin set base. Is this correct? ---------CORRECT ANSWER------- ----------No it should have a mortar bed Corners in a shower receptor should be reinforced by (-) before installing tile. ---------CORRECT ANSWER-----------------50 lb. tear-strength woven glass fiber webbing hot mopped in place and extending 4 inches in all directions from each corner The best method of waterproofing a shower is: ---------CORRECT ANSWER-----------------3 layers of 15 lb. felt with hot mopping The total thickness of the mortar bed should never be less than (-) at any point when you are installing shower receptors. ---------CORRECT ANSWER-----------------1 3/4 inches Organic mastic should NOT be used for: ---------CORRECT ANSWER-------- ---------tile in a shower
What is the minimum drain for a shower floor? ---------CORRECT ANSWER-----------------1/4 inch per foot What mortar mix ratio should be used for a shower (pipe) wall? --------- CORRECT ANSWER-----------------1: When the plug is removed for a tile-lined shower receptor: --------- CORRECT ANSWER-----------------all of the test water must drain out by gravity through the weep holes How should you clean glass mosaic tile (other than small tile mosaic)? ------ ---CORRECT ANSWER-----------------a soft brush; after it is set, scrub with an abrasive nylon pad and give a light acid cleaning (1 part muriatic acid: 20 parts water). What should the tile-setting first do, when installing a mosaic (glass or marble) floor? ---------CORRECT ANSWER-----------------lay out the mosaic at a different site, keeping each sheet as tight as possible, and starting with sheet No. 1 When laying a ceramic mosaic tile floor, the tile-setter should: --------- CORRECT ANSWER-----------------begin at the intersection of the two LONGEST right angle walls
Where the ceiling joins the wall: ---------CORRECT ANSWER----------------- the ceiling lap should float freely When applying scratch coat to a ceiling, how long do you wait before applying the second coat? ---------CORRECT ANSWER----------------- overnight When back-buttering a ceiling, what thickness do you observe? --------- CORRECT ANSWER-----------------1/16 inch Adjusting tile after it is applied to a ceiling, you can expеct: --------- CORRECT ANSWER-----------------to break the bond The dash coat should consist of (-) after sandblasting a concrete wall. ------- --CORRECT ANSWER-----------------consist of 1 part Portland cement: 1. parts graded sharp fine sand To rough sandblast an exterior concrete wall: ---------CORRECT ANSWER- ----------------each nozzle requires about 300 cfm of air at a minimum of 90 psi. Blasting is begun at the top, and the nozzle is directed from side-to- side at a distance of about 24 inches from the surface After a worker sandblasts a wall, apply: ---------CORRECT ANSWER--------- --------dash coat
What should you add to your dry-mixed sand and cenent as a wetting agent, after sandblasting a concrete wall? ---------CORRECT ANSWER------ -----------1 part antihydro : 5 parts water (-) is NOT true of epoxies. ---------CORRECT ANSWER-----------------they have a very long pot life What should you do if you spill epoxy material on your hands? --------- CORRECT ANSWER-----------------wash off immediately and thoroughly with water Which is NOT true when using epoxy or mastic adhesive? --------- CORRECT ANSWER-----------------block off area so that fumes will travel to other areas What kind(s) of Portland cement is/are used on Roman tubs? --------- CORRECT ANSWER-----------------Type I or II (-) is used to set ceramic tile in Roman tubs: ---------CORRECT ANSWER--- --------------Portland cement mortar A Roman bath should be water-tested: ---------CORRECT ANSWER---------- -------at least 24 hours Water testing Roman tubs (after hot mopping) should occur: --------- CORRECT ANSWER-----------------before tiling
When using a quarry rack: ---------CORRECT ANSWER-----------------The rack must always be square Before using a quarry rack, you should: ---------CORRECT ANSWER--------- --------Use a chalk line When using a quarry rack: ---------CORRECT ANSWER-----------------rack, but butt tiles toward the same corner of the rack, and toward the same corner of the room or building A dispute arises between you and another contractor about who is responsible for cleaning up some scraps and trash. The owner pays for the clean-up and charges you (the C-54 contractor) because the architect determines that you are the responsible party. This procedure is: --------- CORRECT ANSWER-----------------in accordance with standard practice. One of the following statements about grout is NOT correct: --------- CORRECT ANSWER-----------------A grout mixture left in an open container can be remixed with warm-to-hot water if it is allowed twice the recommended drying time. A mortar bed should be (-) thick to require a scratch coat over cement. ------ ---CORRECT ANSWER-----------------3/4" Which of the following provides for the best bond for tile? ---------CORRECT ANSWER-----------------immediate placement of tile on freshly combed mortar
On concrete surfaces on which exterior tile is laid, the maximum spacing allowed for expansion joints is: ---------CORRECT ANSWER----------------- 20 feet A bond is: ---------CORRECT ANSWER-----------------adherence of one material to another Regarding thin-set installation, which of the following is INCORRECT? ------ ---CORRECT ANSWER-----------------soak tiles in water before application Which of the following is NOT correct? ---------CORRECT ANSWER---------- -------additional welt of tiles will help provide a bond on mortar that has too long after combing and the bond of tile on re-combed mortar Where you must till to bring the floor level to the proper grade to receive the mortar bed, use: ---------CORRECT ANSWER-----------------1 part Portland cement: 3 parts sand : 4 parts coarse aggregate (-) is NOT a waterproofing admixture ---------CORRECT ANSWER------------ -----THL dust Metal lath on gypsum sheathing should be all EXCEPT one of the following: ---------CORRECT ANSWER-----------------it should be lapped at least 1"
