InterNACHI How to Inspect Attic Ventilation and Interior Practice Test

These questions are part of the practice quiz. Start practicing

• According to home inspection standards, inspectors are ____________ to check the mechanical ventilation system by activating thermostatically operated fans.
• Where are air-leakage pathways most commonly found in a building?
• Which material should not obstruct attic ventilation openings?
• Which of the following describes the transfer of heat from one molecule to another?
• Which installation is prohibited due to safety concerns?
• _____ are intended to reduce the summer's heat gain and the winter's heat loss.
• Air transportation accounts for more than _____ of all water-vapor movement in building cavities.
• A handrail should allow users to maintain what type of grasp without twisting or releasing?
• What can excessive moisture in the attic lead to?
• What should be avoided when installing insulation in an attic?
• True or False: The insulation recommendations made by the U.S. DOE have been generally increased and exceed building code requirements.
• What is the best practice for ensuring adequate ventilation in an attic?
• To stop thermal bridging in an attic, what is recommended regarding the installation of insulation?
• What can be a result of inadequate attic ventilation?
• When inspecting, what is an important factor to check regarding knob-and-tube wiring?
• What is the ideal condition for attic insulation depth to prevent heat loss?
• What can be a result of insufficient attic ventilation?
• What is the minimum clear width required for an egress door when opened to 90 degrees?
• Every landing should be at least how many inches measured in the direction of travel?
• In a home located in Zone 2, what is the minimum R-value for a ceiling as stated by the DOE?
• How many cups of water can enter through a 1/2-inch round hole via air transportation in a year?
• What does the still air inside insulation primarily help reduce?
• Can heat move from one body to another by radiation?
• What is the purpose of flashing in building construction?
• What should the HVAC ductwork that runs through unconditioned spaces be?
• Which type of air is less dense?
• What is the primary purpose of attic ventilation?
• Which of the following statements about attic ventilation is true?
• According to the rule of thumb, how much net-vent opening is recommended for every square foot of insulated ceiling?
• What is the minimum R-value for a ceiling in a home located in Zone 5 according to the DOE?
• What happens to materials in contact with the concrete slab of a basement?
• The term R-value is used to describe what aspect of insulation materials?
• Before entering dimly lit attics, how many flashlights are inspectors recommended to bring?
• What is the minimum size for an opening to access an attic space, ensuring a clear passageway for mechanical appliance removal?
• Decorative handrails that hinder maintaining a natural grasp are generally considered what?
• If a house has newer siding, what might have been installed prior to the siding's installation?
• What does a vapor retarder do?
• What are installed in crawlspaces to prevent moisture from the ground from entering the home?
• In which part of the house is it crucial to minimize air leaks?
• What is one advantage of using 2x6 studs instead of 2x4s in wall construction?
• What effect does a basement concrete slab have on materials in contact with it?
• Energy-recovery ventilation systems provide a controlled way of ventilating a home while minimizing what type of loss?
• True or False: Every basement and sleeping room should have at least one emergency escape and rescue opening.
• True or False: The required egress door must be a side-hinged door with a 32-inch clear width when opened and 78 inches of clear opening.
• What is the transfer of heat energy by electromagnetic wave motion called?
• What is the hazard associated with installing insulation around knob-and-tube wiring?
• What is a common hazard associated with kraft paper facings on insulation?
• What type of vapor diffusion retarders should be avoided on the interior side of basement finishes?
• What is the significance of the dew point in relation to insulation?
• Should humid air in the basement's interior be allowed to leak into the finished wall assembly?
• Which of the following heat transfer methods involves the movement of warmed air?
• What is a common consequence of moisture being trapped in basement finishes?
• True or False: Compressed insulation will provide its full rated R-value.
• Which form of heat transfer involves direct contact between molecules?
• What could be a consequence of not covering vapor diffusion-retarders in attics?
• What type of barrier is polyethylene sheeting categorized as?
• If the ducts of the HVAC system run through unconditioned spaces, what should be done to the ductwork?
• In a 100-square-foot wall, how much water can diffuse through drywall without a vapor diffusion retarder?
• What is the purpose of air sealing in homes?
• What is the minimum space that should be maintained between insulation and the roof deck sheathing?
• What problem can arise from compressing insulation in the eaves area?
• If insulation sized for 6 ¼ inches is stuffed into a 5 ½-inch wall cavity, the effectiveness of the insulation will?
• In relation to emergency escape and rescue openings, what is the minimum horizontal area of a window well in square feet?
• What can lead to moisture buildup in the attic?
• How does a basement's concrete slab impact humidity levels?
• What is the minimum tread depth for a standard stair in inches?
• Which type of ventilation relies on the natural buoyancy of warm air to enhance airflow?
• What factor must be considered when designing bathroom ventilation systems?
• What is a vapor barrier classified as?
• How much total R-value does approximately 6 inches thick of loose fiberglass insulation provide?
• An effectively built wall is designed to control which of the following?
• Which combination of vents provides the most effective attic ventilation?
• Enclosures that do not allow passage of a certain diameter sphere should be removed. What is the minimum diameter in inches?
• What does proper attic ventilation primarily aim to prevent?
• In terms of health, why is attic ventilation important?
• To prevent _________ in an attic, it is recommended that enough insulation be installed to cover the tops of the floor joists.
• The lites in a window sash are divided horizontally and vertically by narrow strips called what?
• What is the required accessibility for water shut-off valves during an inspection?
• A balanced, whole-house ventilation system, if properly designed and installed, will neither pressurize nor depressurize a house. Is this statement True or False?
• What is the result of insulating an attic properly regarding thermal bridging?
• What is the effectiveness of air sealing compared to installing a vapor diffusion retarder?
• For an attic space, what is the minimum opening size required?
• What percentage of the water used for plants enters the air through ventilation?
• Must bathroom vents terminate at the home's exterior?
• What is the focus of building science in relation to heat transfer?
• What is the term for the temperature and moisture concentration at which water vapor begins to condense?
• Intermediate rails or balusters must withstand a horizontal load of how many pounds on an area equal to 1 square foot?
• Adding more insulation in areas where insulation is already present can reduce what expense?
• Why should the kraft paper or standard foil vapor diffusion-retarder facings on blanket insulation be covered?
• What is the primary benefit of reducing summer heat gain?
• What indicates that insulation is not performing effectively?
• True or False: Air sealing is not important as air does not carry moisture.
• Is installing a vapor diffusion retarder the most important step for controlling moisture in a wall?
• What is a potential problem with powered roof fans?
• Why must insulation fit properly in tight areas like eaves?
• What is the intended function of radiant barriers?
• What is the maximum diameter of a sphere that can pass through intermediate rails or ornamental enclosures at raised floor areas?
• Are inspectors required to inform clients about inadequate insulation?
• In the context of air movement, why is it important to manage air sealing?
• Effective moisture control in a home requires what in addition to vapor diffusion retarders?
• What is an essential feature of a handrail according to safety standards?
• What is the maximum variation in tread depth allowed within a flight of stairs?
• What is the ideal air flow direction for attic ventilation?
• What safety equipment should inspectors wear while inspecting electrical panels?
• What does OVE stand for?
• The R-value per inch of material for fiberglass batt insulation is what value?
• The transfer of heat from one molecule to another describes the process of ___________.
• Why are electrically powered roof fans considered less than ideal?
• What does effective attic ventilation help prevent?
• How does the International Residential Code (IRC) define vapor retarders?
• What is the recommended area for adequate natural ventilation in a bedroom?
• What aspect of building performance measures the efficacy of insulation?
• What is required to cover rigid foam insulation board?
• Insulation that is compressed will not provide what?
• What can excessive moisture in an attic lead to?
• What is a significant risk of using low permeability vapor retarders incorrectly?
• What effect does compressing insulation into the eaves area have?
• What should be done if ductwork runs through an unconditioned space?
• Which type of door is acceptable for emergency escape and rescue openings?
• Are inspectors required to report any signs of active water penetration observed at the time of inspection?
• What is the R-value of common 1/2-inch wood sheathing?
• Why should polyethylene sheeting and vinyl wallpaper not be installed on the interior side of basement finishes?
• How can energy-recovery ventilation systems benefit a home?
• What process warms the air next to a hot surface and then moves that warm air?
• Which is a characteristic of Class III vapor retarders?
• What type of barrier can help minimize both heat gain and loss?
• Which of the following is not a function of vapor retarders?
• Insulation in an unfinished space can be installed by _____ it.
• How often should attic vents be checked for functionality?
• Moisture flow by vapor diffusion is governed by which law of thermodynamics?
• In regards to water vapor movement through walls, which method allows for significantly more vapor transmission?
• What is an example of a Class III vapor retarder?
• If slabs do not have a moisture vapor diffusion-retarder underneath, what are they considered in terms of finishing?
• What safety measure should inspectors consider before entering attics?
• What can be a consequence of inadequate attic ventilation?
• Which of the following is an example of a liquid?
• What is the maximum allowable sill height of a window opening for emergency escape and rescue openings?
• What is the minimum height requirement for a horizontal guard?
• Why is it misleading to label some materials as "vapor barriers"?
• In most jurisdictions, what type of studs can be spaced on 24-inch centers?
• Which of the following best describes the role of ventilation in a home?
• What is the primary issue with insulation that is poorly fitted to its cavity?
• How frequently should attic ventilation be assessed?
• The purpose of spot ventilation is to control the concentration of pollutants in which area?
• Common wood sheathing used by builders typically has an R-value of?
• What is necessary for fire and smoke characteristics of rigid-foam insulation board?
• What is the primary purpose of attic ventilation?
• What is a characteristic of well-insulated HVAC ductwork?
• What is the minimum horizontal load that intermediate rails or balusters should withstand on an area equal to 1 square foot?
• What factor, along with material and thickness, determines the R-value of insulation?
• What accounts for more than 98% of all water vapor movement in building cavities?
• Should insulation be installed without compressing it?
• In general, how do open-cell foams compare to closed-cell foams regarding water movement through walls?
• In building science, how can heat move from one body to another?
• What should be done with rigid foam insulation to comply with safety regulations?
• Which type of air carries more water vapor?
• Which statement is true about the characteristics of hot air compared to cold air?
• Which material is considered a Class I vapor retarder?
• How does wet insulation function as an insulator?
• In which situation is it crucial for an inspector to report observed conditions during an inspection?
• What is the primary function of a proper attic ventilation system?
• Are radiant barriers effective in preventing winter heat loss?
• What is the effect of low permeability vapor diffusion retarders in foundation walls?
• Is it a requirement for inspectors to activate thermostatically operated fans during a check of mechanical ventilation systems?
• Which factor is crucial in determining the amount of ventilation required for an attic?
• What can result from too much airflow in an attic?
• Is it required to inspect insulation in unfinished spaces such as attics?
• What is the purpose of intermediate rails or balusters in construction?
• What is one common sign of inadequate ventilation in an attic?
• According to home inspection standards, an inspector is _______ to report any present condition or clear indication of active water penetration.
• Insulation recommendations by which organization generally exceed local building codes?
• What effect does air sealing have on heat flow due to air movement?
• Should visible water damage during an inspection be reported to the client?
• Is it necessary to move a representative number of drop-ceiling tiles during an inspection?
• As air warms, what happens to its ability to hold water vapor?
• Which of the following is NOT a requirement for egress doors?
• During an inspection, what should the inspector check for regarding attic insulation?
• What type of hinge is required for an egress door?
• What is the function of a guard in construction?
• Which system in a building is considered one of the most complex?
• True or False: An enclosed accessible space under stairs should be protected on the enclosed side with a 1/2-inch gypsum board.
• What is the minimum height for a stair riser?
• Which method of insulating involves applying material in a format that fills gaps and cracks?
• What plays a significant role in effective moisture control besides vapor diffusion retarders?
• The design strength of a guard should resist what amount of concentrated load applied at any point along the handrail or the top of the guard?
• What is one method to improve attic ventilation?
• Which of the following is NOT a common type of attic vent?
• Adding more insulation in the attic will likely _____ energy bills.