IRC Exam Part 8 - Chapter 4 – Foundations
Questions with Correct Answers 2026
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, sandy gravel
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 sa
nd, 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, sandy, s
ilty 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 b
edrock 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, sedimentary
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 weathe
ring 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 fl
oor 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 provided.
- correct answer-6"
R408.6 Under-floor space.
The minimum Width and Thickness for concrete footings shall not be less than ________ inches in Width
and __________ inches in depth. - correct answer-12
6
R403.1.1 Minimum size.
Footingvprojectionsvshallvnotvbevlessvthanv_________vandvshallvnotvexceedvthevthicknessvofvthevfooting
.v-
correctvanswer-2vinches
R403.1.1vMinimumvsize.
Allvexteriorvfootingsvshallvbevplacedvatvleastv_________vinchesvbelowvthevundisturbedvgroundvsurface.
v-
correctvanswer-12vinches
R403.1.4vMinimumvdepth.
Questions with Correct Answers 2026
In the absence of a complete geotechnical evaluation to determine the soil's characteristics, sandy gravel
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 sa
nd, 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, sandy, s
ilty 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 b
edrock 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, sedimentary
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 weathe
ring 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 fl
oor 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 provided.
- correct answer-6"
R408.6 Under-floor space.
The minimum Width and Thickness for concrete footings shall not be less than ________ inches in Width
and __________ inches in depth. - correct answer-12
6
R403.1.1 Minimum size.
Footingvprojectionsvshallvnotvbevlessvthanv_________vandvshallvnotvexceedvthevthicknessvofvthevfooting
.v-
correctvanswer-2vinches
R403.1.1vMinimumvsize.
Allvexteriorvfootingsvshallvbevplacedvatvleastv_________vinchesvbelowvthevundisturbedvgroundvsurface.
v-
correctvanswer-12vinches
R403.1.4vMinimumvdepth.
