IRC Building Code 2025
Exam Questions with
Complete Answers
Denning [Date] [Course title]
,In Seismic Design Categories D0, D1, and D2, _____ stone masonry walls shall not be used. - Correct
Answers: Rubble
R404.1.1.1 Masonry foundation walls.
In Seismic Design Categories Do, D1 and D2, foundations with stem walls shall be provided with a
minimum of one No. ___ bar within 12 inches of the top of the wall and one No. ___ bar located 3 to 4
inches from the bottom of the footing. - Correct Answers: #4
#4
R403.1.3.1 Foundations with stemwalls
The grade away from foundation walls shall fall a minimum of ___ inches within the first ____ feet. -
Correct Answers: 6 in.
10 ft.
(Read exception)
R401.3 Drainage
In flood hazard areas, enclosed areas below the design flood elevation shall be used sole for:
1._____
2._____
3._____ - Correct Answers: Parking of vehicles
Building access or
Storage
R322.3.5 Enclosed areas below design flood elevation.
Address number shall be a minimum of ___ inches high with a minimum stroke of ____inch. - Correct
Answers: 4 in.
, 1/2 in.
R319.1 Address numbers
Protection of wood and wood based products from ___ shall be provided by the use of naturally durable
wood or wood that is preservative treated. - Correct Answers: Decay
R317.1 Location required
Dwelling Units in two-family dwellings shall be separated from each other by wall and/or floor
assemblies having not less than ___-hour fire resistive rating. - Correct Answers: 1 hour
R302.3 Two family dwellings
In areas where the probability of termite infestation is "very heavy", the clearance between foam
plastics installed above grade and exposed earth shall be at least ____ inches. - Correct Answers: 6 in.
R318.4 Foam plastic protection
A thermal barrier is not required for foam plastic insulation in an attic that is entered only for purposes
of ____ or ____. - Correct Answers: Repairs or maintenance
R316.5.3 Attics
Foam plastic shall be separated from the interior of a building by an approved ____ ____ of minimum
____- inch gypsum wallboard. - Correct Answers: Thermal barrier
1/2 in.
R316.4 Thermal barrier
Exam Questions with
Complete Answers
Denning [Date] [Course title]
,In Seismic Design Categories D0, D1, and D2, _____ stone masonry walls shall not be used. - Correct
Answers: Rubble
R404.1.1.1 Masonry foundation walls.
In Seismic Design Categories Do, D1 and D2, foundations with stem walls shall be provided with a
minimum of one No. ___ bar within 12 inches of the top of the wall and one No. ___ bar located 3 to 4
inches from the bottom of the footing. - Correct Answers: #4
#4
R403.1.3.1 Foundations with stemwalls
The grade away from foundation walls shall fall a minimum of ___ inches within the first ____ feet. -
Correct Answers: 6 in.
10 ft.
(Read exception)
R401.3 Drainage
In flood hazard areas, enclosed areas below the design flood elevation shall be used sole for:
1._____
2._____
3._____ - Correct Answers: Parking of vehicles
Building access or
Storage
R322.3.5 Enclosed areas below design flood elevation.
Address number shall be a minimum of ___ inches high with a minimum stroke of ____inch. - Correct
Answers: 4 in.
, 1/2 in.
R319.1 Address numbers
Protection of wood and wood based products from ___ shall be provided by the use of naturally durable
wood or wood that is preservative treated. - Correct Answers: Decay
R317.1 Location required
Dwelling Units in two-family dwellings shall be separated from each other by wall and/or floor
assemblies having not less than ___-hour fire resistive rating. - Correct Answers: 1 hour
R302.3 Two family dwellings
In areas where the probability of termite infestation is "very heavy", the clearance between foam
plastics installed above grade and exposed earth shall be at least ____ inches. - Correct Answers: 6 in.
R318.4 Foam plastic protection
A thermal barrier is not required for foam plastic insulation in an attic that is entered only for purposes
of ____ or ____. - Correct Answers: Repairs or maintenance
R316.5.3 Attics
Foam plastic shall be separated from the interior of a building by an approved ____ ____ of minimum
____- inch gypsum wallboard. - Correct Answers: Thermal barrier
1/2 in.
R316.4 Thermal barrier
