IRC BUILDING CODE FINAL EXAM
STUDY GUIDE 2025/2026
COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<BRAND NEW VERSION>
In Seismic Design Categories D0, D1, and D2, _____ stone masonry
walls shall not be used. - 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. - 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. - 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._____ - 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. - 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.
- 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. - 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. - 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 ____. - 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. -
ANSWER Thermal barrier
1/2 in.
R316.4 Thermal barrier
All exterior footings shall be placed at least ___ inches below the
undisturbed ground surface. - 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. - 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. - 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. - ANSWER 1/2 in.
7 in.
R403.1.6 Foundation anchorage
Isolated hollow masonry piers shall have a minimum nominal thickness
of ____ inches. - 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. - 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. - ANSWER 2-inch by 6-inch
R404.2.2 Stud size
Wood sill plates shall be a minimum of ____-inch by ____-inch nominal
lumber. - ANSWER 2-inch by 4-inch
R404.3 Wood sill plates
Perforated foundation drains shall be surrounded with an approved ____
____. - 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. - 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. - ANSWER Class I
6
R408.3 Unvented crawl space
True/false smoke detectors are required to to be connected to normal
electrical wiring as well as battery-powered backup system - ANSWER
True
Where should smoke detectors be located in a residential home? -
ANSWER In each sleeping rooms and corridor provided access to
bedroom
The minimum required floor access opening to all under-floor spaces
shall be ____ inches by ____ inches. - 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. - 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. - ANSWER 1.5 in.
3 in.
STUDY GUIDE 2025/2026
COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<BRAND NEW VERSION>
In Seismic Design Categories D0, D1, and D2, _____ stone masonry
walls shall not be used. - 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. - 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. - 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._____ - 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. - 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.
- 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. - 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. - 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 ____. - 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. -
ANSWER Thermal barrier
1/2 in.
R316.4 Thermal barrier
All exterior footings shall be placed at least ___ inches below the
undisturbed ground surface. - 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. - 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. - 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. - ANSWER 1/2 in.
7 in.
R403.1.6 Foundation anchorage
Isolated hollow masonry piers shall have a minimum nominal thickness
of ____ inches. - 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. - 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. - ANSWER 2-inch by 6-inch
R404.2.2 Stud size
Wood sill plates shall be a minimum of ____-inch by ____-inch nominal
lumber. - ANSWER 2-inch by 4-inch
R404.3 Wood sill plates
Perforated foundation drains shall be surrounded with an approved ____
____. - 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. - 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. - ANSWER Class I
6
R408.3 Unvented crawl space
True/false smoke detectors are required to to be connected to normal
electrical wiring as well as battery-powered backup system - ANSWER
True
Where should smoke detectors be located in a residential home? -
ANSWER In each sleeping rooms and corridor provided access to
bedroom
The minimum required floor access opening to all under-floor spaces
shall be ____ inches by ____ inches. - 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. - 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. - ANSWER 1.5 in.
3 in.
