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.
Thec minimumc Widthc andc Thicknessc forc concretec footingsc shallc notc bec lessc thanc ________c inchesc inc W
i
dthc andc __________c inchesc inc depth.c -c correctc answer-12
6
R403.1.1c Minimumc size.
Footingcprojectionsc shallc notc bec lessc thanc _________c andcshallc notc exceedc thec thicknesscofc thecfooting
. - correctc answer-2c inches
R403.1.1c Minimumc size.
Allc exteriorcfootingsc shallcbec placedc atc leastc _________c inchesc belowc thec undisturbedc groundc surface.c
-
correctc answer-12c inches
R403.1.4c Minimumc depth.
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.
Thec minimumc Widthc andc Thicknessc forc concretec footingsc shallc notc bec lessc thanc ________c inchesc inc W
i
dthc andc __________c inchesc inc depth.c -c correctc answer-12
6
R403.1.1c Minimumc size.
Footingcprojectionsc shallc notc bec lessc thanc _________c andcshallc notc exceedc thec thicknesscofc thecfooting
. - correctc answer-2c inches
R403.1.1c Minimumc size.
Allc exteriorcfootingsc shallcbec placedc atc leastc _________c inchesc belowc thec undisturbedc groundc surface.c
-
correctc answer-12c inches
R403.1.4c Minimumc depth.
