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NRCA Tile Installer practice questions

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Question 1Safety, Fall Protection, and Jobsites

On a low-slope roof, what is the primary purpose of a guardrail system installed along the open edge?

  1. To mark the boundary of the work area
  2. To support the weight of roofing materials
  3. To keep workers from falling to a lower level Correct answer.
  4. To protect the membrane from foot traffic

Explanation

Guardrails are a form of fall protection whose function is to prevent a worker from reaching and falling off an unprotected edge. Material storage, membrane protection, and area marking are separate concerns handled by other controls.

Question 2Safety, Fall Protection, and Jobsites

A roofer must access a steep-slope roof to install tile. Which practice best reflects the hierarchy of fall protection controls?

  1. Eliminate the exposure first, then use guardrails or a personal fall arrest system Correct answer.
  2. Start work and add protection only if someone reports a hazard
  3. Rely on worker caution once on the roof
  4. Use a warning line as the sole control on the steep slope

Explanation

The hierarchy of controls favors eliminating or preventing exposure before relying on personal protective equipment. When exposure cannot be eliminated, guardrails or a personal fall arrest system provide positive protection. Worker caution and warning lines alone are not adequate on steep-slope tile work.

Question 3Safety, Fall Protection, and Jobsites

Before using a personal fall arrest harness and lanyard on a tile roof, a worker should verify which of the following?

  1. The lifeline is made of natural fiber rope
  2. The lanyard is longer than the roof height
  3. The harness color matches the crew uniform
  4. The anchorage is rated and the system has been inspected Correct answer.

Explanation

A personal fall arrest system depends on an adequate anchorage and equipment that has been inspected and found free of damage. Color and rope material are irrelevant, and lanyard length must be matched to fall clearance, not roof height.

Question 4Safety, Fall Protection, and Jobsites

What is the main hazard of stacking tile bundles close to an unguarded roof edge?

  1. The tile may absorb moisture from the deck
  2. The tile may fade from sun exposure
  3. The roof deck may become too cool to adhere
  4. Bundles can slide or be knocked off, striking workers below Correct answer.

Explanation

Material staged near an open edge creates a dropped-object hazard for workers and others below and can also create a tripping or fall hazard near the edge. Bundles should be kept back from edges and secured. Sun fading, deck temperature, and moisture absorption are not the primary concern here.

Question 5Safety, Fall Protection, and Jobsites

A tile crew is setting up a jobsite. Which practice best controls housekeeping hazards on the roof?

  1. Allow extension cords to cross access routes
  2. Sweep debris and route cords away from walking paths Correct answer.
  3. Store all tools at the roof edge for easy reach
  4. Leave broken tile and packaging where it falls

Explanation

Good housekeeping means removing debris and keeping cords and tools out of walkways so workers do not trip or slip. Debris left in place, tools at the edge, and cords across access routes all increase injury risk.

Question 6Safety, Fall Protection, and Jobsites

Which condition most commonly causes ladder-related injuries during roof access for tile installation?

  1. Carrying tools in a tool belt
  2. Tying off the ladder at the top
  3. Using a ladder with a damaged or missing foot Correct answer.
  4. Setting the ladder on level ground

Explanation

Damaged or missing ladder feet allow the base to slip, which is a leading cause of ladder falls. Carrying tools in a belt, level footing, and tying off the ladder are accepted safe practices rather than causes of injury.

Question 7Safety, Fall Protection, and Jobsites

When is a worker required to use fall protection while performing tile work on a roof?

  1. Whenever the worker is exposed to an unprotected fall hazard at the regulated height Correct answer.
  2. Only during the first hour of the shift
  3. Only when the roof pitch exceeds 12:12
  4. Only when the building owner requests it

Explanation

Fall protection is required whenever a worker is exposed to an unprotected fall hazard at or above the height set by the applicable standard, regardless of pitch or time of day. Owner preference and a single pitch threshold do not define the duty.

Question 8Safety, Fall Protection, and Jobsites

A worker is installing tile near a skylight on a low-slope roof. What is the appropriate control?

  1. Paint the skylight a bright color and proceed
  2. Place a warning cone beside the skylight
  3. Assume the skylight dome will support a person's weight
  4. Cover or guard the skylight so it cannot be walked on or fallen through Correct answer.

Explanation

Skylights and other roof openings are fall hazards and must be covered with a secure cover or guarded. A dome is not a walking surface and a cone or paint does not prevent a fall.

Question 9Safety, Fall Protection, and Jobsites

Which item is part of a personal fall arrest system for roof tile work?

  1. A dust mask and safety glasses
  2. A hard hat and work gloves
  3. A knee pad and tool pouch
  4. A full-body harness with a shock-absorbing lanyard Correct answer.

Explanation

A personal fall arrest system consists of an anchorage, connectors, and a body support such as a full-body harness, often with a shock-absorbing lanyard. The other options are general PPE or tool-carrying items that do not arrest a fall.

Question 10Safety, Fall Protection, and Jobsites

A tile installer notices a frayed lifeline on the fall arrest system. What is the correct action?

  1. Shorten the lifeline to bypass the damaged section
  2. Continue using it and report it at the end of the week
  3. Remove the damaged component from service and tag it out Correct answer.
  4. Wrap tape over the fray and keep working

Explanation

Damaged fall arrest equipment must be removed from service immediately and tagged so it is not reused until inspected or replaced by a competent person. Tape, shortening, or delayed reporting leaves a defective system in use.

Question 11Safety, Fall Protection, and Jobsites

Which practice best protects workers below while tile is being hoisted to a roof?

  1. Hoist loads during breaks so no one is nearby
  2. Rely on workers to look up when they hear the hoist
  3. Hoist loads over the area where the crew is standing
  4. Barricade the hoist area and keep workers clear of the load path Correct answer.

Explanation

Hoisting creates a dropped-load hazard, so the area beneath the load path must be barricaded and kept clear. Relying on workers to watch or timing loads around breaks does not control the hazard.

Question 12Safety, Fall Protection, and Jobsites

What is the purpose of a warning line system on a low-slope roof?

  1. To anchor a personal fall arrest system
  2. To support stacked tile bundles
  3. To warn workers that they are approaching an unprotected edge Correct answer.
  4. To physically stop a falling worker

Explanation

A warning line is a barrier that signals workers they are nearing an unprotected edge; it does not physically stop a fall or serve as an anchor. Warning lines are used as part of a broader fall protection plan, not as a structural support.

Question 13Safety, Fall Protection, and Jobsites

A crew is working on a roof in high wind with loose tile and packaging. Which action best addresses the hazard?

  1. Continue work and hold packaging by hand
  2. Move loose materials to the roof edge for the wind to clear
  3. Stop work, secure or remove loose materials, and resume when conditions improve Correct answer.
  4. Increase the number of workers on the roof

Explanation

High wind increases the risk of dropped objects and loss of balance, so work should pause while loose materials are secured or removed. Moving materials to the edge or adding workers increases exposure rather than controlling it.

Question 14Safety, Fall Protection, and Jobsites

A worker must cross a roof to reach the tile staging area. Which practice reduces the risk of slipping on a steep-slope roof?

  1. Walk on the tile surface in smooth-soled shoes
  2. Move quickly across the slope to reduce exposure time
  3. Carry a heavy bundle to improve balance
  4. Use roof jacks, toe boards, or a staging platform for footing Correct answer.

Explanation

Roof jacks, toe boards, and staging platforms provide stable footing on steep slopes, and footwear should have slip-resistant soles. Smooth soles, heavy loads, and hurrying all increase the chance of a slip or fall.

Question 15Safety, Fall Protection, and Jobsites

Which statement correctly describes the role of a competent person on a tile roofing jobsite?

  1. The general contractor's receptionist
  2. Any worker who has worked on roofs for one year
  3. A person capable of identifying hazards and authorized to take prompt corrective action Correct answer.
  4. The worker with the highest seniority on the crew

Explanation

A competent person is defined by the ability to identify existing and predictable hazards and the authority to take prompt corrective measures. Time on the job, seniority, or office role alone do not confer that designation.

Question 16Safety, Fall Protection, and Jobsites

A tile installer is using a circular saw to cut tile on the roof. Which control best reduces silica dust exposure?

  1. Cut dry and stand upwind
  2. Cut only when the wind is calm
  3. Use wet cutting or dust collection with respiratory protection Correct answer.
  4. Wear a hard hat while cutting

Explanation

Wet cutting and dust collection suppress airborne silica at the source, and respiratory protection supplements those controls. Standing upwind, waiting for calm wind, or wearing a hard hat does not control the dust generated by cutting.

Question 17Safety, Fall Protection, and Jobsites

Which condition would make a roof anchorage unsuitable for a personal fall arrest system?

  1. It is a structural member rated for the required load
  2. It has been inspected by a competent person
  3. It is located away from the roof edge
  4. It is a vent pipe or lightweight conduit Correct answer.

Explanation

Anchorage points must be capable of supporting the loads required by the fall arrest system, and vent pipes or lightweight conduit are not structural. A rated member, inspection, and proper location are characteristics of a suitable anchorage.

Question 18Safety, Fall Protection, and Jobsites

A worker is exposed to electrical lines near a roof edge while installing tile. Which practice best addresses the hazard?

  1. Assume the lines are insulated and proceed
  2. Ask a coworker to watch the lines
  3. Work faster to reduce exposure time
  4. Maintain the required clearance and use non-conductive tools where appropriate Correct answer.

Explanation

Electrical hazards near roofs require maintaining the mandated clearance from energized lines and using appropriate equipment. Assuming insulation, hurrying, or relying on a spotter does not remove the electrical hazard.

Question 19Safety, Fall Protection, and Jobsites

Which practice supports effective jobsite communication during a tile installation on an occupied building?

  1. Remove barricades at the end of each morning
  2. Coordinate with the building owner and post barricades and signage below Correct answer.
  3. Allow occupants to walk under the hoist area
  4. Keep the building occupants unaware of roof work

Explanation

Coordination with the building owner and clear barricades and signage keep occupants away from dropped-object and hoisting hazards. Hiding the work, removing barricades early, or allowing access under the hoist area all increase risk to occupants.

Question 20Safety, Fall Protection, and Jobsites

A crew must decide how to protect a roof opening that will remain open during the shift. Which solution is acceptable?

  1. A piece of cardboard laid over the opening
  2. A note taped to the roof deck
  3. A cone placed beside the opening
  4. A cover secured against displacement and marked as a hole Correct answer.

Explanation

Roof openings must be guarded or covered with a cover that is secured against displacement and clearly marked to identify the hazard. Cardboard, cones, and notes do not prevent a worker from falling through the opening.

Question 21Roof Deck, Underlayment, and Substrate Preparation

On a roof deck, what is the primary purpose of installing underlayment beneath the field tile?

  1. To serve as the finished weatherproofing layer if tiles crack
  2. To insulate the attic and reduce heat loss through the roof
  3. To provide a secondary weather barrier and separate tiles from the deck Correct answer.
  4. To glue the tiles down and prevent them from sliding

Explanation

Underlayment is a secondary weather barrier that sheds any water driven past the tile field and keeps tiles from contacting the sheathing. It is not the primary roof covering, an adhesive, or an insulation product.

Question 22Roof Deck, Underlayment, and Substrate Preparation

Which condition in roof sheathing must be corrected before any underlayment is laid?

  1. Sheathing with slight surface texture from the mill
  2. Sheathing that is clean, dry, and firmly fastened to the framing
  3. Sheathing that is delaminated, rotted, or flexing underfoot Correct answer.
  4. Sheathing that shows visible wood grain and knots

Explanation

Underlayment needs a sound, flat substrate, so rotted, delaminated, or springy sheathing must be repaired or replaced first. Mill texture, grain, and knots are normal and do not prevent installation.

Question 23Roof Deck, Underlayment, and Substrate Preparation

What is the minimum nominal thickness of wood roof sheathing typically required to support tile roofing where the manufacturer permits it?

  1. 3/8 inch
  2. 1/2 inch
  3. 1 inch
  4. 5/8 inch Correct answer.

Explanation

Tile roofs are heavy, and codes commonly require a minimum nominal 5/8-inch wood structural panel or equivalent for tile support. Thinner panels such as 3/8 or 1/2 inch generally do not provide adequate stiffness for tile loads.

Question 24Roof Deck, Underlayment, and Substrate Preparation

Why must roof underlayment be installed with the courses lapped in the direction of water flow?

  1. So the laps create a capillary break that dries the deck
  2. So the upper course overlaps the lower course and sheds water downhill Correct answer.
  3. So the laps align with the rake edge for a straight appearance
  4. So the lower course overlaps the upper course to hide fasteners

Explanation

Water runs downhill, so each higher course must overlap the one below it, shingle-fashion, to keep water on the surface. Reversing the lap lets water run behind the underlayment at the seam.

Question 25Roof Deck, Underlayment, and Substrate Preparation

A steep-slope tile roof is being installed in a cold climate where ice dams are expected at the eaves. What should be installed along the eave edge?

  1. A layer of building paper lapped over the fascia
  2. A double layer of standard organic felt
  3. An ice-dam protection membrane extending up from the eave Correct answer.
  4. A coat of asphalt primer on the bare sheathing

Explanation

Ice-dam protection membrane is required at eaves in areas prone to ice damming because it seals around fasteners and resists water backing up under the courses. Felt, paper, or primer cannot resist standing water at the eave.

Question 26Roof Deck, Underlayment, and Substrate Preparation

What is the correct fastener schedule for attaching underlayment to wood sheathing?

  1. Fasteners spaced per the manufacturer's schedule, typically with caps or discs Correct answer.
  2. Staples only at the corners of each sheet
  3. No fasteners, since tile fasteners will hold the underlayment
  4. A single row of nails along the horizontal centerline

Explanation

Underlayment must be fastened per the manufacturer's published schedule, often with cap nails or discs to resist wind and prevent tear-out. Corner-only, centerline-only, or unfastened installation lets the membrane lift or wrinkle.

Question 27Roof Deck, Underlayment, and Substrate Preparation

When installing a self-adhering underlayment membrane on a roof deck, what surface preparation is required?

  1. Leave the sheathing dusty so the membrane can slide into place
  2. Coat the deck with a release agent before rolling the membrane
  3. Apply a primer only if the deck is dusty or chalky Correct answer.
  4. Dampen the sheathing to activate the adhesive

Explanation

Self-adhering membranes bond best to a clean, dry, smooth deck; a primer is used where the surface is dusty, chalky, or otherwise specified by the manufacturer. Wetting, dust, or release agents defeat the adhesive bond.

Question 28Roof Deck, Underlayment, and Substrate Preparation

Why is it important to keep underlayment courses straight and wrinkle-free before tile installation?

  1. Wrinkles prevent the tile from sliding down the roof slope
  2. Wrinkles are required to allow the underlayment to expand thermally
  3. Wrinkles can telegraph through the tile and create uneven bedding and stress points Correct answer.
  4. Wrinkles improve drainage by channeling water to the eave

Explanation

Wrinkles and buckles create high spots that telegraph through the tile, cause uneven mortar bedding, and concentrate stress that can crack tile. Underlayment should lie flat and be pulled taut during installation.

Question 29Roof Deck, Underlayment, and Substrate Preparation

What is the purpose of installing a metal drip edge at the eave before the underlayment is applied?

  1. To vent the attic space beneath the roof deck
  2. To fasten the first course of tile to the deck
  3. To act as the primary flashing at valleys
  4. To direct water away from the fascia and support the underlayment edge Correct answer.

Explanation

Eave drip edge is installed over the sheathing so the underlayment laps over it, directing water off the roof and away from the fascia. It is not a tile fastener, valley flashing, or vent.

Question 30Roof Deck, Underlayment, and Substrate Preparation

At a roof valley, how should underlayment be installed before the valley flashing is placed?

  1. Stop the underlayment at the valley and leave the sheathing exposed
  2. Cut the underlayment short of the valley centerline on both sides
  3. Run the underlayment across the valley and lap it over the valley flashing Correct answer.
  4. Install the underlayment only after the tile in the valley is set

Explanation

Underlayment should be carried across the valley and lapped so water is directed into the valley flashing, which is then installed over it. Cutting short or leaving sheathing exposed allows water to reach the deck.

Question 31Roof Deck, Underlayment, and Substrate Preparation

What is the required clearance between the roof deck underlayment and the top of a chimney or wall where flashing will be installed?

  1. The underlayment should stop one inch below the flashing
  2. The underlayment should be cut flush with the deck edge
  3. The underlayment should extend up the wall or chimney at least several inches behind the flashing Correct answer.
  4. The underlayment should be omitted near all penetrations

Explanation

Underlayment should be turned up the wall or chimney several inches so the flashing can lap over it, keeping water from reaching the deck behind the flashing. Stopping it short or omitting it creates a leak path at the penetration.

Question 32Roof Deck, Underlayment, and Substrate Preparation

What is the minimum slope at which many tile manufacturers permit tile installation over a single layer of underlayment without additional waterproofing?

  1. 1:12
  2. 8:12
  3. 2:12
  4. 4:12 Correct answer.

Explanation

Many tile systems specify a minimum slope of 4:12 for standard underlayment installation, with additional waterproofing required below that. Slopes of 1:12 or 2:12 generally fall below the threshold for standard tile application.

Question 33Roof Deck, Underlayment, and Substrate Preparation

What is the purpose of a cricket (saddle) built on the roof deck at a chimney wider than 30 inches?

  1. To divert water around the chimney and prevent ponding behind it Correct answer.
  2. To allow the underlayment to terminate without flashing
  3. To support the weight of the tile around the chimney
  4. To provide a mounting surface for the chimney cap

Explanation

A cricket is a small peaked roof built on the uphill side of a wide chimney to divert water around it and prevent water from ponding or backing into the flashing. It is a drainage detail, not structural support or a cap mount.

Question 34Roof Deck, Underlayment, and Substrate Preparation

When installing underlayment on a roof with a slope greater than 4:12, what installation method is commonly used to resist wind uplift?

  1. Horizontal courses lapped and fastened with cap nails or discs per the manufacturer Correct answer.
  2. Underlayment stapled only at the ridge
  3. Vertical strips laid parallel to the slope with no laps
  4. A single continuous sheet laid loose over the deck

Explanation

On steeper slopes, underlayment is installed in horizontal courses, lapped shingle-fashion, and fastened with cap nails or discs per the manufacturer to resist wind uplift. Vertical, loose, or ridge-only installation leaves the membrane vulnerable to wind.

Question 35Roof Deck, Underlayment, and Substrate Preparation

What should be done if the roof sheathing has gaps wider than the manufacturer's allowance before underlayment is installed?

  1. Fill or cover the gaps with solid sheathing or approved material Correct answer.
  2. Leave the gaps to provide ventilation
  3. Caulk the gaps with roof cement
  4. Cover the gaps with underlayment only

Explanation

Gaps wider than allowed must be filled or covered with solid material so the underlayment has continuous support and cannot sag into the gap. Underlayment alone, open gaps, or cement do not provide proper support.

Question 36Roof Deck, Underlayment, and Substrate Preparation

Why is it important to install underlayment over the ridge and lap it from both sides before ridge tile is set?

  1. To allow the ridge to vent moisture from the attic
  2. To create a bond between the two roof slopes
  3. To keep the ridge cap from being fastened to the deck
  4. To provide continuous weather protection at the ridge where the two roof planes meet Correct answer.

Explanation

The ridge is where two planes meet and is vulnerable to wind-driven rain, so underlayment should be carried over and lapped from both sides before ridge tile. It is not a fastening detail, vent, or structural bond.

Question 37Roof Deck, Underlayment, and Substrate Preparation

Which of the following best describes the correct handling of underlayment at a sidewall where step flashing will be installed?

  1. Terminate the underlayment at the base of the wall
  2. Install the underlayment over the step flashing
  3. Cut the underlayment away where step flashing will sit
  4. Run the underlayment up the wall behind the step flashing Correct answer.

Explanation

Underlayment is turned up the sidewall so step flashing can lap over it, keeping water out from behind the flashing. Terminating at the base, cutting it away, or covering the flashing all create leak paths.

Question 38Roof Deck, Underlayment, and Substrate Preparation

What is the purpose of a ventilation gap or vented underlayment system in some tile roof assemblies?

  1. To reduce the weight of the roof assembly
  2. To provide a path for rainwater to drain under the tile
  3. To allow moisture vapor to escape from the deck and reduce condensation Correct answer.
  4. To allow the tile to expand and contract freely

Explanation

Vented underlayment or a counter-batten gap allows moisture vapor from the deck to escape and reduces condensation under the tile. It is not for tile movement, drainage of rainwater, or weight reduction.

Question 39Roof Deck, Underlayment, and Substrate Preparation

On a low-slope tile roof below the manufacturer's minimum, what additional measure is typically required under the tile?

  1. A fully adhered waterproof membrane over the entire deck Correct answer.
  2. A single layer of standard felt
  3. A layer of gravel ballast
  4. No underlayment, since tile sheds water

Explanation

Below the minimum slope, a fully adhered waterproof membrane is typically required because water can back up and the tile alone cannot be relied on to shed it. Standard felt, ballast, or no underlayment would not provide the needed waterproofing.

Question 40Roof Deck, Underlayment, and Substrate Preparation

What is the correct order of installation for underlayment, eave drip edge, and the first course of tile?

  1. Underlayment, then tile, then drip edge
  2. Underlayment, then drip edge, then tile
  3. Drip edge, then underlayment, then tile Correct answer.
  4. Tile, then underlayment, then drip edge

Explanation

The eave drip edge is installed first, the underlayment is lapped over it, and then the tile is installed. This sequence lets water shed off the drip edge and keeps the underlayment edge protected.

Question 41Roof Deck, Underlayment, and Substrate Preparation

Which of these is a sign that roof sheathing is not adequately fastened to the framing before underlayment is installed?

  1. The sheathing flexes or moves when walked on Correct answer.
  2. The sheathing panels have visible grade stamps
  3. The sheathing edges are aligned
  4. The sheathing has a uniform color

Explanation

Flexing or movement underfoot indicates loose or inadequate fastening, which must be corrected before underlayment and tile are installed. Grade stamps, color, and edge alignment are not indicators of inadequate fastening.

Question 42Roof Deck, Underlayment, and Substrate Preparation

Why should underlayment not be installed over a wet or frosted roof deck?

  1. Moisture trapped beneath the underlayment can cause deck rot and loss of adhesion Correct answer.
  2. The underlayment will adhere too strongly and cannot be adjusted
  3. The tile will not cure properly
  4. The underlayment will change color

Explanation

Installing over wet or frosted sheathing traps moisture, which can rot the deck and prevent proper adhesion of self-adhering membranes. Underlayment should only be installed over a clean, dry deck.

Question 43Roof Deck, Underlayment, and Substrate Preparation

What is the purpose of a batten or counter-batten system installed over the underlayment on a tile roof?

  1. To reduce the dead load of the tile on the deck
  2. To glue the tile down without fasteners
  3. To replace the underlayment as the waterproofing layer
  4. To create a drainage and ventilation space and provide a fastening base for tile Correct answer.

Explanation

Battens or counter-battens create a gap for drainage and ventilation and give a fastening base for the tile. They do not replace the underlayment, bond the tile, or reduce dead load.

Question 44Roof Deck, Underlayment, and Substrate Preparation

What is the correct treatment of underlayment at a roof-to-wall intersection where the wall is above the roof?

  1. Run the underlayment over the wall flashing
  2. Run the underlayment up the wall and lap the wall flashing over it Correct answer.
  3. Stop the underlayment at the roof plane and caulk the joint
  4. Omit the underlayment at the wall intersection

Explanation

At a roof-to-wall intersection, underlayment is turned up the wall and the wall flashing laps over it so water cannot get behind the flashing. Running it over the flashing, stopping short, or omitting it creates a leak path.

Question 45Tile Materials, Types, and Standards

Under ANSI A108.02, what does the term "mortar bed" specifically refer to in tile installation?

  1. A layer of plywood underlayment fastened to the subfloor
  2. An adhesive troweled directly onto a gypsum wallboard surface
  3. A latex-modified thin-set applied with a 1/4-inch notched trowel
  4. A mixture of cement, sand, and water applied over a cleavage membrane or bonded to a substrate Correct answer.

Explanation

A mortar bed is a thick-set layer of cement, sand, and water typically 3/4 inch or more, installed over a cleavage membrane or bonded to a suitable substrate. It is distinct from thin-set adhesives, which are applied in thin layers with a trowel.

Question 46Tile Materials, Types, and Standards

Which ANSI standard specifically governs dry-set Portland cement mortar for ceramic tile?

  1. ANSI A118.1 Correct answer.
  2. ANSI A108.5
  3. ANSI A136.1
  4. ANSI A118.4

Explanation

ANSI A118.1 is the specification for dry-set Portland cement mortar, the basic unmodified thin-set. A118.4 covers modified dry-set mortar, A136.1 covers organic adhesives, and A108.5 covers installation of dry-set mortar.

Question 47Tile Materials, Types, and Standards

Which tile type is produced by the dust-pressed method and is characterized by a water absorption rate of less than 0.5 percent?

  1. Porcelain tile Correct answer.
  2. Glazed wall tile
  3. Quarry tile
  4. Saltillo tile

Explanation

Porcelain tile is a dense, dust-pressed product with water absorption typically below 0.5 percent per ANSI A326.3 classification. Its low porosity results from fine clays and high firing temperatures.

Question 48Tile Materials, Types, and Standards

What is the primary purpose of a cleavage membrane in a mortar bed installation?

  1. To bond the mortar bed rigidly to the subfloor
  2. To increase the compressive strength of the mortar
  3. To provide waterproofing beneath the setting bed
  4. To decouple the mortar bed from the structural substrate and allow independent movement Correct answer.

Explanation

A cleavage membrane separates the reinforced mortar bed from the substrate so the two can move independently and prevent reflective cracking. It is not a bonding agent or a waterproofing layer.

Question 49Tile Materials, Types, and Standards

Which term describes a tile that has a slightly irregular, handcrafted edge and surface produced by a specific manufacturing process?

  1. Rectified tile
  2. Extruded tile Correct answer.
  3. Modular tile
  4. Pressed tile

Explanation

Extruded tile is formed by forcing clay through a die, which can produce a slightly irregular, rustic edge and surface. Rectified tile is precisely cut after firing, and modular tile refers to sizing that allows grout joint alignment.

Question 50Tile Materials, Types, and Standards

In the ANSI A326.3 slip-resistance classification, which category is intended for areas that are always wet, such as shower floors?

  1. DCOF of 0.60 or greater Correct answer.
  2. DCOF of 0.42 or greater
  3. DCOF of 0.35 or greater
  4. DCOF of 0.50 or greater

Explanation

ANSI A326.3 sets a minimum DCOF of 0.60 for tiles used in areas that are always wet, such as shower floors and pool decks. The 0.42 threshold applies to level interior spaces that may become wet.