IRC Building Code Questions | 153 Questions with
100% Correct Answers
In Seismic Design Categories D0, D1, and D2, _____ stone masonry walls shall not be used.
Correct Answer: 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 Answer: #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 Answer: 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 Answer: 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 Answer: 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 Answer: 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 Answer: 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 Answer: 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 Answer: 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 Answer: Thermal barrier
1/2 in.
R316.4 Thermal barrier
All exterior footings shall be placed at least ___ inches below the undisturbed ground surface.
Correct Answer: 12 in.
(Where applicable, the dept of footings shall also conform to R403.1.4.1 - R403.1.4.2)
R403.1.4 Minimum length
The top surface of footings shall be level. The bottom surface of footings shall not have a slope
exceeding ____ unit vertical in ____ units horizontal. Correct Answer: 1:10
R403.1.5 Slope
Wood sill plates shall be anchored to the foundation with anchor bolts spaced a maximum of
____ feet on center. Correct Answer: 6 ft.
R403.1.6 Foundation anchorage
Foundation anchor bolts shall be at least ___ inch in diameter and shall extend a minimum of
___ inches into the concrete or grouted cells of concrete masonry units. Correct Answer: 1/2 in.
7 in.
R403.1.6 Foundation anchorage
Isolated hollow masonry piers shall have a minimum nominal thickness of ____ inches. Correct
Answer: 8 in.
R404.1.9 Isolated masonry piers.
Hollow masonry piers shall be capped with ____ inches of solid masonry or concrete or a
masonry cap block. Correct Answer: 4 in.
, As an alternative, the cavities of of the top course must be filled with concrete or grout.
R404.1.9.1
The studs used in wood foundation walls shall be ____-inch by ____-inch members. Correct
Answer: 2-inch by 6-inch
R404.2.2 Stud size
Wood sill plates shall be a minimum of ____-inch by ____-inch nominal lumber. Correct
Answer: 2-inch by 4-inch
R404.3 Wood sill plates
Perforated foundation drains shall be surrounded with an approved ____ ____. Correct Answer:
Filter membrane
(or the filter membrane shall cover the washed gravel or crushed rock covering the drain)
R405.1 Concrete or masonry foundations
The minimum net area of ventilation openings shall be not less than ____ square foot for each
___ square feet of under-floor space. Correct Answer: 1 sq. ft. for each 150 sq. ft.
R408.1 Ventilation
Ventilation openings in under-floor spaces are not required where the ground is covered with a
continuous ____ vapor retarder and the joints overlap at least ____ inches. Correct Answer:
Class I
6
R408.3 Unvented crawl space
The minimum required floor access opening to all under-floor spaces shall be ____ inches by
____ inches. Correct Answer: 18 inches by 24 inches.
R408.4 Access
Open web truss or I-Joist floor assemblies require a ____-inch gypsum wallboard membrane,
____-inch wood structural panel membrane, or the equivalent on the underside. Correct Answer:
1/2 gypsum
5/8 wood
R501.3 Fire protection of floors
The ends of each floor joist, beam or girder shall have not less than ____ inches of bearing on
wood or metal and not less than ____ inches on masonry or concrete. Correct Answer: 1.5 in.
100% Correct Answers
In Seismic Design Categories D0, D1, and D2, _____ stone masonry walls shall not be used.
Correct Answer: 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 Answer: #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 Answer: 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 Answer: 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 Answer: 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 Answer: 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 Answer: 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 Answer: 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 Answer: 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 Answer: Thermal barrier
1/2 in.
R316.4 Thermal barrier
All exterior footings shall be placed at least ___ inches below the undisturbed ground surface.
Correct Answer: 12 in.
(Where applicable, the dept of footings shall also conform to R403.1.4.1 - R403.1.4.2)
R403.1.4 Minimum length
The top surface of footings shall be level. The bottom surface of footings shall not have a slope
exceeding ____ unit vertical in ____ units horizontal. Correct Answer: 1:10
R403.1.5 Slope
Wood sill plates shall be anchored to the foundation with anchor bolts spaced a maximum of
____ feet on center. Correct Answer: 6 ft.
R403.1.6 Foundation anchorage
Foundation anchor bolts shall be at least ___ inch in diameter and shall extend a minimum of
___ inches into the concrete or grouted cells of concrete masonry units. Correct Answer: 1/2 in.
7 in.
R403.1.6 Foundation anchorage
Isolated hollow masonry piers shall have a minimum nominal thickness of ____ inches. Correct
Answer: 8 in.
R404.1.9 Isolated masonry piers.
Hollow masonry piers shall be capped with ____ inches of solid masonry or concrete or a
masonry cap block. Correct Answer: 4 in.
, As an alternative, the cavities of of the top course must be filled with concrete or grout.
R404.1.9.1
The studs used in wood foundation walls shall be ____-inch by ____-inch members. Correct
Answer: 2-inch by 6-inch
R404.2.2 Stud size
Wood sill plates shall be a minimum of ____-inch by ____-inch nominal lumber. Correct
Answer: 2-inch by 4-inch
R404.3 Wood sill plates
Perforated foundation drains shall be surrounded with an approved ____ ____. Correct Answer:
Filter membrane
(or the filter membrane shall cover the washed gravel or crushed rock covering the drain)
R405.1 Concrete or masonry foundations
The minimum net area of ventilation openings shall be not less than ____ square foot for each
___ square feet of under-floor space. Correct Answer: 1 sq. ft. for each 150 sq. ft.
R408.1 Ventilation
Ventilation openings in under-floor spaces are not required where the ground is covered with a
continuous ____ vapor retarder and the joints overlap at least ____ inches. Correct Answer:
Class I
6
R408.3 Unvented crawl space
The minimum required floor access opening to all under-floor spaces shall be ____ inches by
____ inches. Correct Answer: 18 inches by 24 inches.
R408.4 Access
Open web truss or I-Joist floor assemblies require a ____-inch gypsum wallboard membrane,
____-inch wood structural panel membrane, or the equivalent on the underside. Correct Answer:
1/2 gypsum
5/8 wood
R501.3 Fire protection of floors
The ends of each floor joist, beam or girder shall have not less than ____ inches of bearing on
wood or metal and not less than ____ inches on masonry or concrete. Correct Answer: 1.5 in.
