2025 IRC EXAM- CHAPTER 4 – FOUNDATIONS
QUESTIONS WITH CORRECT ANSWERS 2025
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,GsandyGgra
velGmaterialGshallGbeGassumedGtoGhaveGaGpresumptiveGload-bearingGvalueGofG_________Gpsf.G-
GcorrectGanswer-3,000Gpsf
R401.4.1GSoilGtests.
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,Gsand,Gsilty
Gsand,GclayeyGsand,GsiltyGgravel,GandGclayeyGgravelGmaterialGshallGbeGassumedGtoGhaveGaGpresumptiveGload
-bearingGvalueGofG_________Gpsf.G-GcorrectGanswer-2,000Gpsf
R401.4.1GSoilGtests.
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,Gclay,Gsand
y,GsiltyGclay,GclayeyGsilt,Gsilt,GandGsandyGsiltclayGshallGbeGassumedGtoGhaveGaGpresumptiveGload-
bearingGvalueGofG_________Gpsf.G-GcorrectGanswer-1,500Gpsf
R401.4.1GSoilGtests.
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,Gcrystalline
GbedrockGshallGbeGassumedGtoGhaveGaGpresumptiveGload-bearingGvalueGofG_________Gpsf.G-
GcorrectGanswer-12,000
R401.4.1GSoilGtests.
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,Gsedimenta
ryGandGfoliatedGrockGshallGbeGassumedGtoGhaveGaGpresumptiveGload-bearingGvalueGofG_________Gpsf.G-
GcorrectGanswer-4,000
R401.4.1GSoilGtests.
, ConcreteGusedGinGaGbasementGslabGshallGhaveGaGminimumGstrengthGofG________GpsiGwhereGaGsevereGwea
theringGpotentialGexists.G-GcorrectGanswer-2,500Gpsi
R402.2GConcrete.
MinimumGcompressiveGstrengthGofGconcreteGwhetherGorGnotGitGisGexposedGtoGweatherGisG________Gpsi.G-
GcorrectGanswer-2,500Gpsi
R402.2GConcrete.
WhereGthereGisGevidenceGthatGtheGgroundwaterGtableGcanGriseGtoGwithinG________GinchesGofGtheGfinished
GfloorGatGtheGbuildingGperimeter,GtheGgradeGinGtheGunder-
floorGspaceGshallGbeGasGhighGasGtheGoutsideGfinishedGgradeGunlessGanGapprovedGdrainageGsystemGisGprovid
ed.G-GcorrectGanswer-6"
R408.6GUnder-floorGspace.
TheGminimumGWidthGandGThicknessGforGconcreteGfootingsGshallGnotGbeGlessGthanG________GinchesGinGWi
dthGandG__________GinchesGinGdepth.G-GcorrectGanswer-12
6
R403.1.1GMinimumGsize.
FootingGprojectionsGshallGnotGbeGlessGthanG_________GandGshallGnotGexceedGtheGthicknessGofGtheGfooting.
G-GcorrectGanswer-2Ginches
R403.1.1GMinimumGsize.
AllGexteriorGfootingsGshallGbeGplacedGatGleastG_________GinchesGbelowGtheGundisturbedGgroundGsurface.G-
GcorrectGanswer-12Ginches
R403.1.4GMinimumGdepth.
QUESTIONS WITH CORRECT ANSWERS 2025
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,GsandyGgra
velGmaterialGshallGbeGassumedGtoGhaveGaGpresumptiveGload-bearingGvalueGofG_________Gpsf.G-
GcorrectGanswer-3,000Gpsf
R401.4.1GSoilGtests.
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,Gsand,Gsilty
Gsand,GclayeyGsand,GsiltyGgravel,GandGclayeyGgravelGmaterialGshallGbeGassumedGtoGhaveGaGpresumptiveGload
-bearingGvalueGofG_________Gpsf.G-GcorrectGanswer-2,000Gpsf
R401.4.1GSoilGtests.
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,Gclay,Gsand
y,GsiltyGclay,GclayeyGsilt,Gsilt,GandGsandyGsiltclayGshallGbeGassumedGtoGhaveGaGpresumptiveGload-
bearingGvalueGofG_________Gpsf.G-GcorrectGanswer-1,500Gpsf
R401.4.1GSoilGtests.
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,Gcrystalline
GbedrockGshallGbeGassumedGtoGhaveGaGpresumptiveGload-bearingGvalueGofG_________Gpsf.G-
GcorrectGanswer-12,000
R401.4.1GSoilGtests.
InGtheGabsenceGofGaGcompleteGgeotechnicalGevaluationGtoGdetermineGtheGsoil'sGcharacteristics,Gsedimenta
ryGandGfoliatedGrockGshallGbeGassumedGtoGhaveGaGpresumptiveGload-bearingGvalueGofG_________Gpsf.G-
GcorrectGanswer-4,000
R401.4.1GSoilGtests.
, ConcreteGusedGinGaGbasementGslabGshallGhaveGaGminimumGstrengthGofG________GpsiGwhereGaGsevereGwea
theringGpotentialGexists.G-GcorrectGanswer-2,500Gpsi
R402.2GConcrete.
MinimumGcompressiveGstrengthGofGconcreteGwhetherGorGnotGitGisGexposedGtoGweatherGisG________Gpsi.G-
GcorrectGanswer-2,500Gpsi
R402.2GConcrete.
WhereGthereGisGevidenceGthatGtheGgroundwaterGtableGcanGriseGtoGwithinG________GinchesGofGtheGfinished
GfloorGatGtheGbuildingGperimeter,GtheGgradeGinGtheGunder-
floorGspaceGshallGbeGasGhighGasGtheGoutsideGfinishedGgradeGunlessGanGapprovedGdrainageGsystemGisGprovid
ed.G-GcorrectGanswer-6"
R408.6GUnder-floorGspace.
TheGminimumGWidthGandGThicknessGforGconcreteGfootingsGshallGnotGbeGlessGthanG________GinchesGinGWi
dthGandG__________GinchesGinGdepth.G-GcorrectGanswer-12
6
R403.1.1GMinimumGsize.
FootingGprojectionsGshallGnotGbeGlessGthanG_________GandGshallGnotGexceedGtheGthicknessGofGtheGfooting.
G-GcorrectGanswer-2Ginches
R403.1.1GMinimumGsize.
AllGexteriorGfootingsGshallGbeGplacedGatGleastG_________GinchesGbelowGtheGundisturbedGgroundGsurface.G-
GcorrectGanswer-12Ginches
R403.1.4GMinimumGdepth.
