Video, part 3 of 4
NHIE practice questions, part 3
50 practice questions for the National Home Inspector Exam, on heating; insulation, moisture, and ventilation; mechanical exhaust; plumbing; and interior. Each question is read aloud with its four options. Then you get 5 seconds to pick before the answer and the reason. The video runs about 42 minutes.
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Chapters
Pick a question to start the video there.
The 50 questions, with answers
Here is every question in the video, in the same order, with the answer and the reason under it. None of them is on the free practice exam, a paid practice exam, or the mastery exam.
Question 1, Heating, at 0:21
What is a tankless coil in a hot water boiler essentially?
- AA second expansion tank
- BAn automatic air separator
- CA pressure reducing valve
- DOne more heat exchanger
The answer is D
The coil is finned copper mounted in the boiler, and water circulating through it picks up heat, which is what any heat exchanger does. An expansion tank is also a vessel inside the system, but it absorbs volume rather than transferring heat.
Question 2, Heating, at 1:03
A separate water tank stands beside a boiler with a finned copper coil inside the tank. Which arrangement is that?
- AA range boiler
- BAn indirect-fired water heater
- CA tankless coil
- DA combination feed and relief valve
The answer is B
Moving the coil out of the boiler and into a tank is the whole definition of the indirect-fired water heater. A range boiler also uses a separate tank and fills by convection.
Question 3, Heating, at 1:45
Why does steam carry a large amount of energy?
- AChanging water into steam takes a great deal of energy
- BConvection adds energy to the steam as it rises
- CThe boiler holds the steam at about 180 degrees F
- DHouse steam systems are held above 15 psig while running
The answer is A
The energy that goes into the change of state comes back out when the steam condenses in the distribution devices, and that absorption and release is what latent heat names. Convection looks plausible because it is what moves the steam, but moving something is not the same as putting energy into it.
Question 4, Heating, at 2:38
A home inspector finds a corn cob burning furnace in a basement. What should the inspector do?
- AOperate it at the normal control and report the flame color
- BReport it as a defect because the fuel is not a wood fuel
- CDisclaim the inspection of it and recommend a qualified specialist
- DInspect it and report the condition of its heat exchanger
The answer is C
Where the fuel is biomass, a home inspector should disclaim the inspection. The inspector should also recommend that a qualified specialist evaluate the appliance, working from the manufacturer's instructions. Biomass is named as a solid fuel rather than as a defect, so calling the furnace a defect because the fuel is not wood invents a verdict that is not given.
Question 5, Insulation, moisture, and ventilation, at 3:42
What is the main purpose of ventilating a house?
- ATo cool the living space in summer
- BTo dilute and remove indoor pollutants
- CTo dry out wet insulation in the attic
- DTo supply combustion air to appliances
The answer is B
The main reason for ventilation is to dilute and remove pollutants that build up indoors. Water vapor, carbon dioxide, VOC, smoke, and combustion products are among them. Combustion air is a separate concern that air sealing can affect.
Question 6, Insulation, moisture, and ventilation, at 4:27
A home inspector finds moisture stains and mold growth on the ceiling beside a drop soffit above the kitchen cabinets. What could this indicate?
- AFluffed insulation in the exterior walls
- BA defect in insulation or air sealing
- CA Class III vapor retarder on the ceiling
- DNormal condensation that needs no report
The answer is B
Drop soffits are among the less obvious spaces next to conditioned space that need insulation, and missing insulation there is hard to see. Stains or mold close to such a soffit can point to a defect in its insulation or air sealing. Treating the stains as normal would miss that clue.
Question 7, Insulation, moisture, and ventilation, at 5:23
Which material is considered a vapor retarder but is NOT meant to serve as one?
- AAluminum foil sheeting
- BKraft paper facing
- CPolyethylene sheeting
- DVinyl wallpaper
The answer is D
Wallpaper made of vinyl or foil resists vapor flow and so acts as a vapor retarder, yet wallpaper is not meant to serve in that role. Kraft paper, polyethylene, and foil sheeting are intended vapor retarder materials.
Question 8, Insulation, moisture, and ventilation, at 6:05
Airborne water vapor may turn to liquid water once the air cools to the:
- AIndoor set point
- BDew point
- CFreezing point
- DHeating degree day
The answer is B
Condensation may occur once air cools to its dew point temperature.
Question 9, Insulation, moisture, and ventilation, at 6:34
A home inspector in climate zone 6 finds plastic sheeting laid over the attic floor insulation. Water condensing beneath the sheeting can cause:
- AShingle curling and flashing failure
- BBackdrafting of fuel-burning appliances
- CFaster drying of the ceiling below
- DWood damage, lower R-value, and fungal growth
The answer is D
Sheeting above the insulation can hold water between the sheeting and the attic floor. Three results follow: damaged wood, insulation that loses R-value, and moisture that supports fungal growth. Water held under the sheeting does not dry faster.
Question 10, Insulation, moisture, and ventilation, at 7:27
According to the manual, the present-day crawl space vent rules:
- AApply only in climate zones 5 to 8
- BAre preferred by most experts over closed crawl spaces
- CLack a scientific or empirical basis
- DCame after air conditioning became common
The answer is C
The crawl space vent rules rest on no scientific or empirical evidence and were written before air conditioning was widespread. Many experts now recommend closed crawl spaces to reduce moisture problems, which is the reverse of preferring vented ones.
Question 11, Insulation, moisture, and ventilation, at 8:17
A home inspector finds mold and rot inside an interior wall chase of a house with a damp crawl space. Such problems can develop in walls and chases that are:
- AOpen to the crawl space
- BLined with OSB sheathing
- CInsulated with unfaced batts
- DBuilt on the windward side
The answer is A
Walls and chases open to the crawl space can carry its moisture upward, and an attic open to the crawl space, common around chimneys and vent chases, can be affected the same way. Unfaced batts are vapor permeable but are not named as the cause.
Question 12, Insulation, moisture, and ventilation, at 9:07
Pouring loose fill insulation straight from the bag, instead of blowing it, is a concern because the insulation:
- ACan lose its fire retardant treatment over time
- BMay not reach the expected R-value
- CReleases fibers that may cause cancer
- DOften becomes an air barrier
The answer is B
A blowing machine mixes the material with air, and that blend is what produces the R-value the maker expects. Poured material skips the blend, so manufacturers may not recommend it. Loose fill is not an air barrier, and the claim that fiberglass is a possible carcinogen does not appear substantiated.
Question 13, Insulation, moisture, and ventilation, at 9:59
Which of the following was one of the original WRB materials?
- ASheathing with an integrated WRB
- BA liquid applied coating
- CSpunbonded house wrap
- DGrade D paper
The answer is D
The earliest WRB materials were Grade D paper, which is Kraft paper soaked in asphalt, and #15 felt, which is soaked in asphalt as well. House wraps, liquid coatings, and sheathing with an integrated WRB came later and have replaced those two in many markets.
Question 14, Insulation, moisture, and ventilation, at 10:45
During an attic inspection, a home inspector finds a radiant barrier draped directly over knob and tube wiring. Which action is BEST?
- AReport the condition and recommend correction by a qualified contractor
- BSwitch off the circuit breaker to that wiring before leaving
- CLift the radiant barrier off the wiring and continue the inspection
- DRecommend coating the wiring with radiant barrier paint
The answer is A
It is unwise for a radiant barrier to touch electrical cables, and knob and tube wiring is singled out as the worst case. A radiant barrier draped over knob and tube wiring is that condition, and the inspector reports it.
Question 15, Insulation, moisture, and ventilation, at 11:43
Ridge ventilation openings are allowed to sit no more than how far below the ridge?
- A3 feet
- B4 feet
- C5 feet
- D6 feet
The answer is A
Ridge openings should be at the ridge, but they are allowed as far as 3 feet below it. Eave openings, by contrast, are now required at the eaves, although older work sometimes placed them higher. A 4 foot drop is past what the rule allows.
Question 16, Insulation, moisture, and ventilation, at 12:24
A closed attic sits under a wood shake roof, and the home inspector cannot confirm a ventilated air space under the shakes. The inspector should:
- Arecommend removing shakes, which can show whether spacers exist
- Breport the attic as ventilated, since it may be vented
- Cassume the space may exist since standards require it
- Dreport that ventilation could not be confirmed
The answer is D
Wood roof coverings over an insulated attic assembly need a ventilated air space beneath them under current standards. The inspector should verify that some way of venting under the roof covering exists, or report that it could not be confirmed. The report should also say what that could mean, including a possible loss of the manufacturer's warranty.
Question 17, Insulation, moisture, and ventilation, at 13:25
A home inspector finds a closed crawl space whose pressure relief duct ties into the HVAC return duct. This connection is:
- Aimproper and should be reported
- Bthe preferred way to equalize the pressure
- Cacceptable as long as the duct has a grille
- Drequired whenever conditioned air is supplied
The answer is A
A relief duct running to the living space, or a grilled opening into the house, should be provided to equalize pressure in a closed crawl space. Neither the duct nor the opening should be tied into the HVAC return duct, so the connection is reported.
Question 18, Insulation, moisture, and ventilation, at 14:17
In the basement batt variant with a Class I vapor retarder against the foundation wall, why is no vapor retarder installed on the finished side?
- AIt avoids a dual vapor retarder and lets the wall dry inward
- BBuilding codes forbid any retarder on a basement wall
- CLiquid water must be able to drain out of the cavity
- DThe concrete foundation wall already acts as a second retarder
The answer is A
With no retarder on the finished side, the wall escapes the problem of a dual vapor retarder, and the framing can still dry into the room. The variant also needs little vapor moving through the foundation, and a wall that stays warmer than the dew point.
Question 19, Mechanical exhaust, at 15:14
Where it is not 10 feet away horizontally, how far below a chimney should a mechanical air intake sit, at MINIMUM?
- A2 feet
- B6 feet
- C18 inches
- D3 feet
The answer is D
An intake needs 10 feet of side clearance from a chimney, a plumbing vent, the vent of fuel-burning equipment, or an exhaust termination. Closer than that, it should sit 3 feet or more below the termination. The 6 foot figure is the horizontal gap between the two exterior hoods of an HRV or ERV, a different rule.
Question 20, Mechanical exhaust, at 16:03
A home inspector finds an HRV in a house heated by electric baseboard units, with no ducted heating or cooling. Which HRV configuration suits this house?
- AFully ducted, with its own supply and exhaust ducts
- BPartially ducted, supplying air through the return
- CAny configuration, if the fans are sized for it
- DSimplified duct, drawing air from the HVAC return
The answer is A
The fully ducted configuration runs apart from the HVAC system on its own exhaust and supply ducts. A house with no ducted heating or cooling can use only that configuration. The partially ducted and simplified configurations both depend on an HVAC return duct, which this house lacks.
Question 21, Mechanical exhaust, at 17:04
Which statement about HRV condensate drainage is correct?
- ALocal jurisdictions may require an auxiliary condensate system
- BCondensate tubing is often not allowed; rigid pipe can be used
- CERVs may need the same condensate drainage system as HRVs
- DHRVs usually produce condensate during the cooling season
The answer is A
HRVs make condensate during the defrost cycle and need a drainage system, which may use pipes or tubes as the manufacturer's instructions allow. Local jurisdictions may require an auxiliary system to manage the condensate as well. Condensate disposal piping serves HRVs only.
Question 22, Mechanical exhaust, at 18:05
In the simplified duct configuration, most pollutant removal is left to:
- Athe HVAC system fan
- Bthe dedicated exhaust grilles
- Cthe fans inside the unit
- Dthe local exhaust fans
The answer is D
With simplified ducting, the bathroom and kitchen exhaust fans carry most of the pollutant load, while the HVAC fan circulates the outside air. Only the fully ducted layout uses the unit's own internal fans for both jobs.
Question 23, Mechanical exhaust, at 18:48
With a whole-house fan running, a home inspector feels air blowing down into the hallway around the attic access hatch. Which defect does this point to?
- ACeiling louvers that fail to open fully
- BToo little attic ventilation opening area
- CA missing or damaged winter cover
- DA worn or loose fan drive belt
The answer is B
When a fan discharges into the attic, the attic needs enough ventilation openings to let that air out; if they are too small, the air is pushed back down through gaps between attic and living space. That points to attic ventilation openings that are blocked or short on area, a typical whole-house fan defect. Louvers that stay shut are a separate defect, seen at the ceiling opening itself.
Question 24, Mechanical exhaust, at 19:48
Exterior HRV and ERV termination hoods usually should sit AT LEAST how high above grade?
- A6 inches
- B9 inches
- C12 inches
- D18 inches
The answer is D
Hoods for supply and exhaust air usually should be raised 18 inches above grade at minimum, or above the snow depth expected. The two hoods should also stand 6 feet or more apart horizontally.
Question 25, Mechanical exhaust, at 20:29
A home inspector calculates a dryer exhaust duct developed length of 40 feet. Before calling the duct too long, the inspector should consider that:
- Aa 90 degree bend fitting can add no length
- Ban electric dryer may allow any length of duct
- Cthe dryer manufacturer may allow a longer duct
- Dthe transition duct may need to be added to the total
The answer is C
Many dryer makers allow a run longer than 35 feet, and the manufacturer's instructions govern when they do. Adding the transition duct would be an error, since developed length leaves it out.
Question 26, Mechanical exhaust, at 21:21
A home inspector finds no damper at a dryer exhaust termination hood. What is the concern?
- AThe dryer will overheat and shut itself off early
- BThe duct developed length will be increased
- CThe open duct gives air and vermin a path in
- DLint will build up in the transition duct
The answer is C
With no damper the duct stays open, letting outside air into the house and giving vermin a way into the duct. A damper that is present can also jam, often against siding or a screen at the hood.
Question 27, Mechanical exhaust, at 22:08
A home inspector finds that a range hood fan blows into the cabinet above it, and the fan is not connected to the duct. The concern is:
- Atoo little makeup air for the house's fuel-burning appliances
- Bcondensation forming on the outside of the duct
- Cthe fan exceeding its rated exhaust capacity
- Dgrease collecting in the wood cabinet and a grease fire
The answer is D
Blowing the fan into the cabinet instead of a sealed duct lets grease settle on the wood, and that buildup could lead to a grease fire. Makeup air is a concern tied to high-rate fans and fuel-burning appliances, not to an unconnected duct.
Question 28, Mechanical exhaust, at 23:03
Which is an acceptable termination for a bathroom exhaust fan duct?
- AInto the crawl space
- BInto the soffit
- CInto the attic near a gable vent
- DThrough the wall to the exterior
The answer is D
A bathroom fan should discharge outdoors, and the attic, crawl space, and soffit do not count as outdoors. Sending exhaust into those spaces was common practice until recently.
Question 29, Mechanical exhaust, at 23:43
Compared with most bend fittings, long radius bend fittings in a dryer exhaust duct:
- Aadd no length to the developed length
- Bhave a smaller developed length
- Care counted as part of the transition duct
- Dadd 5 feet each to the developed length
The answer is B
Most 90 degree bend fittings add 5 feet to the developed length and most 45 degree fittings add 2-1/2 feet. Long radius fittings have a smaller developed length, which is found in the fitting manufacturer's instructions or the IRC. Smaller is not zero, so a fitting that adds no length overstates the rule.
Question 30, Mechanical exhaust, at 24:35
Round kitchen exhaust ducts are usually AT LEAST _____ inches in diameter.
- A6
- B7
- C8
- D12
The answer is A
Kitchen duct size and length come from the fan maker's instructions. Round kitchen ducts usually measure 6 inches or more across, and rectangular ones usually 3-1/4 x 10 inches or more. The 4 inch figure is the diameter of a clothes dryer exhaust duct.
Question 31, Mechanical exhaust, at 25:16
Sheet metal screws or pop rivets that join dryer duct sections should be what length at most?
- A3/8 inch
- B1/8 inch
- C1/2 inch
- D1/4 inch
The answer is B
Fasteners that join dryer duct sections should be 1/8 inch long or shorter. Longer ones would reach into the airway and could catch lint.
Question 32, Mechanical exhaust, at 25:52
An electric clothes dryer exhaust duct should have a support AT LEAST every:
- A4 feet
- B6 feet
- C10 feet
- D12 feet
The answer is D
An electric dryer exhaust duct should be supported every 12 feet or less, while supports for a gas dryer duct go 4 feet or less apart. Neither figure is the 8 foot longest allowed transition duct.
Question 33, Plumbing, at 26:30
The MOST common alleged PEX fitting failures appear in fittings manufactured during which years?
- ABetween 1986 and 2000
- BBetween 1996 and 2010
- CBetween 2004 and 2014
- DBetween 1978 and 1995
The answer is B
For the yellow brass fittings used with PEX, the F1807 above all, the failures appear in fittings made from 1996 through 2010. August 2014 is the date given for the lawsuits.
Question 34, Plumbing, at 27:19
Where should the full-open valve for a water heater be installed?
- AAt the main water service entry to the dwelling
- BOn the cold supply pipe, close to the water heater
- COn the drain fitting at the base of the water heater
- DOn the hot outlet pipe, close to the water heater
The answer is B
The water heater valve belongs on the cold supply pipe, close to the heater, and it should be a full-open type. It does not go on the hot water outlet.
Question 35, Plumbing, at 28:01
A home inspector finds a bathroom sink with no stopper, no strainer, and no cross-bar in the drain outlet. Which typical defect applies?
- AInadequate flow, or inadequate drainage
- BA gap between the sink and the countertop that is unsealed
- CPop-up stopper that fails to open or close, or works improperly
- DNo stopper or other obstruction in the drain outlet
The answer is D
The pop-up item describes a stopper that is present and malfunctioning, and here there is nothing in the outlet at all. A sink needs no stopper, but it does need some device like a strainer or cross-bar to help keep objects out of the drain, so the empty outlet is its own listed defect.
Question 36, Plumbing, at 28:58
A home inspector finds a loose flush handle. What usually repairs this problem?
- ATightening the bolts that hold the tank to the bowl
- BTightening the handle nut found inside the tank
- CReplacing the trip lever and the chain together
- DReplacing the whole flush valve assembly
The answer is B
A nut inside the tank secures the flush handle, and tightening it usually takes care of a loose one. The tank bolts hold the tank to the bowl and have nothing to do with the handle. Replacing assemblies is more work than the repair calls for.
Question 37, Plumbing, at 29:46
On a lawn irrigation system, how far above the highest outlet should a pressure vacuum breaker be, at MINIMUM?
- A2 to 4 inches
- B6 to 12 inches
- C18 to 24 inches
- D1 to 2 inches
The answer is B
One to two inches borrows from the air gap figures, which are a different kind of separation. For a pressure vacuum breaker the figure is 6 to 12 inches or more above the highest outlet. The exact figure varies with local regulations.
Question 38, Plumbing, at 30:32
A steel pressure tank is described as waterlogged. What has happened inside it?
- AThe bladder inside it has ruptured
- BIts water has taken on rust from the shell
- CThe tank has filled above the outlet
- DIts air has leaked away or been absorbed into the water
The answer is D
A ruptured bladder describes a precharged tank, and a steel tank keeps no barrier between its air and its water at all. Air in a steel tank tends to leak out, or is absorbed into the water, and a tank in that state is waterlogged. Restoring its pressure means air must be added.
Question 39, Plumbing, at 31:23
On what three grounds may people find the materials and organisms in well water objectionable?
- AAppearance, pressure, and negative health effects
- BTaste, hardness, and the cost of treating it
- CTaste, appearance, and negative health effects
- DOdor, color, and the age of the well itself
The answer is C
Well water may carry materials and organisms, and the objections to them are how the water tastes, how it looks, and the harm it can do to health. Hardness and the cost of treatment are not among the three grounds.
Question 40, Plumbing, at 32:11
Which region favors ABS pipe, and which favors PVC?
- AABS in the West, PVC in the East
- BABS in the North, PVC in the South
- CNeither material shows a regional pattern
- DABS in the East, PVC in the West
The answer is A
The West favors ABS and the East favors PVC.
Question 41, Plumbing, at 32:47
During an inspection of a crawl space, a home inspector observes that a section of drain pipe lies level. How is that condition treated?
- AAcceptable where the run is 3 inches or larger
- BAcceptable where the run is under 3 inches
- CReportable, as a level pipe slope
- DExcessive slope, which is a separate item
The answer is C
A run lying level, or sloping toward the source of flow, is a pipe slope defect on the defect list. Counter sloped names the second condition only. The fall expected instead is 1/4 inch per foot under 3 inches, and 1/8 inch per foot at 3 inches and above. A slope that is too steep is a different item on that same list, and it applies mostly to pipes of 3 inches and larger.
Question 42, Plumbing, at 33:47
A short turn quarter bend is installed in a 2 inch drainage pipe that is not a fixture drain. Which direction change may it make there?
- AVertical to horizontal only
- BAll three direction changes
- CHorizontal to vertical only
- DHorizontal to horizontal only
The answer is C
In pipes of 2 1/2 inches and under, other than fixture drains of 2 inches and under, a short 90 is allowed for horizontal to vertical alone. Fixture drains of 2 inches and under carry no restriction, and pipes of 3 inches and over add vertical to horizontal.
Question 43, Plumbing, at 34:39
How far from the foundation is the point where the building drain becomes the building sewer?
- AWithin 18 feet
- BWithin 10 feet
- CWithin 40 feet
- DWithin 3 feet
The answer is D
The junction of building drain and building sewer is within 3 feet of the foundation, and the cleanout then sits within 10 feet of the junction itself. The 10 foot figure attaches to the cleanout and not to the junction.
Question 44, Plumbing, at 35:19
A home inspector observes a fixture connected vertically to a wet vented pipe. What does that fixture need?
- AA larger wet vented pipe
- BA wye fitting set horizontally
- CA separate vent of its own
- DAn AAV within 15 degrees
The answer is C
A fixture that joins the wet vented pipe vertically instead of horizontally needs a separate vent of its own. Widening the pipe leaves the direction of the joint unchanged.
Question 45, Plumbing, at 36:01
A home inspector observes an AAV in an attic standing about 3 inches above the insulation. How is that treated?
- AAcceptable where the AAV clears the horizontal drain below it by 4 inches
- BAcceptable where the insulation is batts rather than loose fill
- CAcceptable where the AAV stands within 15 degrees of vertical
- DReportable: an AAV in an attic should clear the insulation by 6 inches
The answer is D
An AAV in an attic should clear the insulation by 6 inches at the least, and 3 inches does not reach that. The 4 inch figure measures up from the horizontal drain, and meeting one figure says nothing about the other.
Question 46, Plumbing, at 37:00
A home inspector finds a septic system with a pump, an aerator, and mixing blades. What should the inspector keep in mind about a system of this kind?
- AIt is a mound-type system, which a qualified professional designs
- BIt may require regular maintenance, a point to put to the client
- CIt often removes the need for a drain field, so no field is found on the lot
- DIt needs a larger tank than a common system, usually 1,500 gallons or more
The answer is B
Pumps, aerators, mixing blades, and field pipes of smaller size are all parts of less common septic systems. Those systems may need regular maintenance, and telling the client so is something the inspector may wish to do. A mound is one example of the kind rather than the whole category, and no tank size attaches to any of them.
Question 47, Plumbing, at 38:08
In a basement, 1/2 inch black steel gas pipe is strapped to the joists at 9 foot intervals. What should the home inspector make of that spacing?
- AIt is correct, since the interval covers copper tubing
- BIt is wider than the 4 foot interval set for that size
- CIt is correct, since 10 feet is the interval at that size
- DIt is wider than the 6 foot interval set for that size
The answer is D
The 4 foot figure belongs to copper at that size, and the 10 foot figure belongs to pipe of 1-1/4 inch and larger. Black steel is held at 6 feet horizontally where the pipe is 1/2 inch, at 8 feet at 3/4 inch and 1 inch, and at 10 feet above that, so 9 feet is too far apart on 1/2 inch pipe. Holding the interval is what keeps stress off the pipe and off the fittings.
Question 48, Plumbing, at 39:13
For oil supply pipe and tubing, the manual treats the phrase properly supported as:
- Adefined by IRC 2018 Chapter 22
- Bset at 6 feet between supports
- Cset by the tank manufacturer
- Dleft undefined by the manual
The answer is D
Proper support is a phrase used for oil pipe and tubing without a definition, and no source for a definition is named, neither the IRC nor the tank manufacturer. The 6 foot figure serves a different purpose: beyond that interval, copper tubing supports may be questionable. It does not define proper support.
Question 49, Interior, at 40:05
Drywall sheets are usually how wide?
- A2 feet
- B3 feet
- C4 feet
- D5 feet
The answer is C
Drywall sheets usually come 4 feet wide, with lengths usually from 8 feet up to 16 feet. The longer sheets are heavy and are usually stocked only by drywall suppliers.
Question 50, Interior, at 40:39
A home inspector finds green board used as the backer for wall tile inside a shower. Which statement about this backer is accurate?
- AIt is allowed when it is installed over a layer of Type X drywall
- BIt is allowed when the tile joints are sealed
- CIt is allowed, and its water-resistant paper makes it a suitable tile backer
- DIt was once allowed but is no longer allowed
The answer is D
Green board has paper with some resistance to water, and it was at one time allowed behind wall tile in showers and in tubs that have a shower. That use is no longer allowed. Its water-resistant paper does not make it an approved shower backer today.
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