2025 IRC EXAM CHAPTERS 3 AND 4
QUESTIONS WITH CORRECT ANSWERS
2025/2026
Photoelectric smoke alarms shall not be installed less than feetThorizontally from a perm
anently installed cooking appliance.
Ionization alarm separation distance is feet, and ionization alarms with a silencing button is
feet. - CORRECT ANSWER -6
20
10
Section R314.3.1 Installation near cooking appliances, Item 3.
Smoke alarms shall receive their primary power from the building wiring where such wiring is served fro
m a commercial source and, where primary power is interrupted, shall receive power from a
. -TCORRECT ANSWER -battery
Section R314.6 Power source.
Physical interconnection of smoke alarms shall not be required where al
arms are installed. - CORRECT ANSWER -listed wireless
(all alarms must sound upon activation of one alarm)
Section R314.4 Interconnection.
Smoke alarms are required in each .
Smoke alarms are required outside each separate .
Smoke alarms are required on each additional story of the dwelling, including and
and not including and .-
CORRECT ANSWER -sleeping room
sleeping area
basements, habitable attics
crawl spaces, uninhabitable attics
, R314.3 Smoke Alarms - Location
Carbon monoxide alarms shall be installed outside of each separate in t
he immediate vicinity of the . - CORRECT ANSWER -sleepingTarea
bedrooms
(CO alarms are not required if there are no fuel-fired appliances and no attached garage)
Section R315.3 Location
When a -
is located within a bedroom or its attached bathroom, a carbon monoxide alar
m shall be installed within the bedroom. - CORRECT ANSWER -fuel-burning appliance
R315.3 Carbon Monoxide Alarms - Location
Foam plastic insulation installed at 4 inches in thickness or less shall have a flame spread indexTof not mo
re than and a smoke-developed index of not more than .-
CORRECT ANSWER -75
450
Section R316.3.1 Foam plastic insulation 4 inches thick or less.
Foam plastic shall be separated from the interior of a building by an approved
of not less than -inch gypsum wallboard. - CORRECT ANSWER -thermal barrier
1/2
Section R316.4 Thermal barrier.
ATthermal barrier is not required for foam plasticTinsulation in an atticTthat is entered only for purposes of
or . - CORRECT ANSWER -repairs
QUESTIONS WITH CORRECT ANSWERS
2025/2026
Photoelectric smoke alarms shall not be installed less than feetThorizontally from a perm
anently installed cooking appliance.
Ionization alarm separation distance is feet, and ionization alarms with a silencing button is
feet. - CORRECT ANSWER -6
20
10
Section R314.3.1 Installation near cooking appliances, Item 3.
Smoke alarms shall receive their primary power from the building wiring where such wiring is served fro
m a commercial source and, where primary power is interrupted, shall receive power from a
. -TCORRECT ANSWER -battery
Section R314.6 Power source.
Physical interconnection of smoke alarms shall not be required where al
arms are installed. - CORRECT ANSWER -listed wireless
(all alarms must sound upon activation of one alarm)
Section R314.4 Interconnection.
Smoke alarms are required in each .
Smoke alarms are required outside each separate .
Smoke alarms are required on each additional story of the dwelling, including and
and not including and .-
CORRECT ANSWER -sleeping room
sleeping area
basements, habitable attics
crawl spaces, uninhabitable attics
, R314.3 Smoke Alarms - Location
Carbon monoxide alarms shall be installed outside of each separate in t
he immediate vicinity of the . - CORRECT ANSWER -sleepingTarea
bedrooms
(CO alarms are not required if there are no fuel-fired appliances and no attached garage)
Section R315.3 Location
When a -
is located within a bedroom or its attached bathroom, a carbon monoxide alar
m shall be installed within the bedroom. - CORRECT ANSWER -fuel-burning appliance
R315.3 Carbon Monoxide Alarms - Location
Foam plastic insulation installed at 4 inches in thickness or less shall have a flame spread indexTof not mo
re than and a smoke-developed index of not more than .-
CORRECT ANSWER -75
450
Section R316.3.1 Foam plastic insulation 4 inches thick or less.
Foam plastic shall be separated from the interior of a building by an approved
of not less than -inch gypsum wallboard. - CORRECT ANSWER -thermal barrier
1/2
Section R316.4 Thermal barrier.
ATthermal barrier is not required for foam plasticTinsulation in an atticTthat is entered only for purposes of
or . - CORRECT ANSWER -repairs
