IRC EXAM- CHAPTER 4 – FOUNDATIONS
QUESTIONS WITH CORRECT ANSWERS 2026
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, sandy gra
vel material shall be assumed to have a presumptive load-bearing value of _________ psf. -
correct answer-3,000 psf
R401.4.1 Soil tests.
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, sand, silty
sand, clayey sand, silty gravel, and clayey gravel material shall be assumed to have a presumptive load
-bearing value of _________ psf. - correct answer-2,000 psf
R401.4.1 Soil tests.
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, clay, sand
y, silty clay, clayey silt, silt, and sandy siltclay shall be assumed to have a presumptive load-
bearing value of _________ psf. - correct answer-1,500 psf
R401.4.1 Soil tests.
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, crystalline
bedrock shall be assumed to have a presumptive load-bearing value of _________ psf. -
correct answer-12,000
R401.4.1 Soil tests.
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, sedimenta
ry and foliated rock shall be assumed to have a presumptive load-bearing value of _________ psf. -
correct answer-4,000
R401.4.1 Soil tests.
, Concrete used in a basement slab shall have a minimum strength of ________ psi where a severe wea
thering potential exists. - correct answer-2,500 psi
R402.2 Concrete.
Minimum compressive strength of concrete whether or not it is exposed to weather is ________ psi. -
correct answer-2,500 psi
R402.2 Concrete.
Where there is evidence that the groundwater table can rise to within ________ inches of the finished
floor at the building perimeter, the grade in the under-
floor space shall be as high as the outside finished grade unless an approved drainage system is provid
ed. - correct answer-6"
R408.6 Under-floor space.
ThezminimumzWidthzandz Thicknessz forz concretez footingszshallznotzbez lesszthanz________z incheszinzW
i
dthzandz__________z inchesz inzdepth.z-zcorrectz answer-12
6
R403.1.1z Minimumzsize.
Footingzprojectionszshallznotzbez lesszthanz_________zandzshallz notzexceedzthezthicknesszofzthezfooting
. - correctz answer-2z inches
R403.1.1z Minimumzsize.
Allzexteriorzfootingszshallzbez placedzatz leastz_________z incheszbelowz thezundisturbedzgroundzsurface.z
-
correctz answer-12z inches
R403.1.4z Minimumzdepth.
QUESTIONS WITH CORRECT ANSWERS 2026
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, sandy gra
vel material shall be assumed to have a presumptive load-bearing value of _________ psf. -
correct answer-3,000 psf
R401.4.1 Soil tests.
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, sand, silty
sand, clayey sand, silty gravel, and clayey gravel material shall be assumed to have a presumptive load
-bearing value of _________ psf. - correct answer-2,000 psf
R401.4.1 Soil tests.
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, clay, sand
y, silty clay, clayey silt, silt, and sandy siltclay shall be assumed to have a presumptive load-
bearing value of _________ psf. - correct answer-1,500 psf
R401.4.1 Soil tests.
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, crystalline
bedrock shall be assumed to have a presumptive load-bearing value of _________ psf. -
correct answer-12,000
R401.4.1 Soil tests.
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, sedimenta
ry and foliated rock shall be assumed to have a presumptive load-bearing value of _________ psf. -
correct answer-4,000
R401.4.1 Soil tests.
, Concrete used in a basement slab shall have a minimum strength of ________ psi where a severe wea
thering potential exists. - correct answer-2,500 psi
R402.2 Concrete.
Minimum compressive strength of concrete whether or not it is exposed to weather is ________ psi. -
correct answer-2,500 psi
R402.2 Concrete.
Where there is evidence that the groundwater table can rise to within ________ inches of the finished
floor at the building perimeter, the grade in the under-
floor space shall be as high as the outside finished grade unless an approved drainage system is provid
ed. - correct answer-6"
R408.6 Under-floor space.
ThezminimumzWidthzandz Thicknessz forz concretez footingszshallznotzbez lesszthanz________z incheszinzW
i
dthzandz__________z inchesz inzdepth.z-zcorrectz answer-12
6
R403.1.1z Minimumzsize.
Footingzprojectionszshallznotzbez lesszthanz_________zandzshallz notzexceedzthezthicknesszofzthezfooting
. - correctz answer-2z inches
R403.1.1z Minimumzsize.
Allzexteriorzfootingszshallzbez placedzatz leastz_________z incheszbelowz thezundisturbedzgroundzsurface.z
-
correctz answer-12z inches
R403.1.4z Minimumzdepth.
