2025 IRC EXAM PART 3 QUESTIONS
WITH CORRECT ANSWERS 2025
Photoelectric smoke alarms shall not be installed less than feet horizontally from a per
manently installed cooking appliance.
Ionization alarm separation distance is feet, and ionization alarms with a silencing button i
s __________ 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 f
rom a commercial source and, where primary power is interrupted, shall receive power from a
. - CORRECT ANSWER -battery
Section R314.6 Power source.
Physical interconnection of smoke alarms shall not be required where
alarms 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
the immediate vicinity of the . - CORRECT ANSWER -sleeping area
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 al
arm 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 index of not
more 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.
A thermal barrier is not required for foam plastic insulation in an attic that is entered only for purpose
s of or . - CORRECT ANSWER -repairs
WITH CORRECT ANSWERS 2025
Photoelectric smoke alarms shall not be installed less than feet horizontally from a per
manently installed cooking appliance.
Ionization alarm separation distance is feet, and ionization alarms with a silencing button i
s __________ 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 f
rom a commercial source and, where primary power is interrupted, shall receive power from a
. - CORRECT ANSWER -battery
Section R314.6 Power source.
Physical interconnection of smoke alarms shall not be required where
alarms 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
the immediate vicinity of the . - CORRECT ANSWER -sleeping area
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 al
arm 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 index of not
more 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.
A thermal barrier is not required for foam plastic insulation in an attic that is entered only for purpose
s of or . - CORRECT ANSWER -repairs
