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ICC RESIDENTIAL BUILDING INSPECTOR
CERTIFICATION PRACTICE EXAM/STUDY GUIDE
2026 ALL QUESTIONS AND CORRECT DETAILED
ANSWERS ALREADY A GRADED WITH EXPERT
FEEDBACK |NEW AND REVISED
Soil Investigation - ANSWER- Required if the soil bearing capacity is
under 1500 psf.
Rebar Yield Strength - ANSWER- Minimum 40,000 PSI for rebar.
Footers minimum width - ANSWER- Minimum width: 12 inches.
Footers extension requirement - ANSWER- Must extend a minimum of
2 inches past the foundation (for chimneys, 6 inches).
Footers minimum depth - ANSWER- Minimum depth: 12 inches to the
bottom of the footer below undisturbed soil or below the frost line.
Stepped Footers - ANSWER- Required if the slope of the ground
exceeds 1 in 10.
Sole Plate (Foundation Wall) - ANSWER- Must use 1/2 inch bolts
embedded 7 inches into the concrete.
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Sole Plate bolt spacing - ANSWER- Bolts should be spaced no more
than 6 feet on center.
Sole Plate positioning - ANSWER- The sole plate must be within 12
inches of the end of the plate.
Foundation Elevation - ANSWER- The top of the foundation must be at
least 12 inches above the street gutter.
Grade Slope from Foundation - ANSWER- Must slope away at 2% for
the first 10 feet.
Footings for Wood - ANSWER- Require stone no greater than 3/4 inch.
Frost Protection (Corners) - ANSWER- In severe weather areas,
insulation for frost protection must extend 60 inches away from the
corner of the foundation.
Soil Classifications - ANSWER- Defined by the Unified Soil
Classification System.
Concrete Foundation Wall Thickness (Seismic Category D) -
ANSWER- If no more than 4 feet 6 inches high, a 6-inch concrete
foundation wall is allowed (normally 7 1/2 inches).
Rubble Stone Foundation - ANSWER- Minimum thickness is 16 inches.
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Hollow Masonry Unit (CMU) Piers (Filled) - ANSWER- Can be 10
times the minimal thickness in height (e.g., a 16x16 inch pier can be 160
inches high).
Drainage Tiles (Crushed Stone) - ANSWER- Need 2 inches of crushed
stone under them.
Drainage System Extension - ANSWER- Must extend 1 foot beyond the
outside edge of the footing.
Vapor Retarders (Polyethylene) - ANSWER- Always 6 mil thick for
basements.
Damp Proofing - ANSWER- Anything allowed for waterproofing can
also be used for damp proofing (e.g., 60 mil flexible polymer cat).
Minimum Post Dimensions for Wood post - ANSWER- 4x4 inches.
Minimum Post Dimensions for Steel post - ANSWER- 3x3 inches or 3-
inch round diameter.
Crawl Space Ventilation - ANSWER- 1 square foot of required openings
for every 150 square feet of foundation area.
ICC RESIDENTIAL BUILDING INSPECTOR
CERTIFICATION PRACTICE EXAM/STUDY GUIDE
2026 ALL QUESTIONS AND CORRECT DETAILED
ANSWERS ALREADY A GRADED WITH EXPERT
FEEDBACK |NEW AND REVISED
Soil Investigation - ANSWER- Required if the soil bearing capacity is
under 1500 psf.
Rebar Yield Strength - ANSWER- Minimum 40,000 PSI for rebar.
Footers minimum width - ANSWER- Minimum width: 12 inches.
Footers extension requirement - ANSWER- Must extend a minimum of
2 inches past the foundation (for chimneys, 6 inches).
Footers minimum depth - ANSWER- Minimum depth: 12 inches to the
bottom of the footer below undisturbed soil or below the frost line.
Stepped Footers - ANSWER- Required if the slope of the ground
exceeds 1 in 10.
Sole Plate (Foundation Wall) - ANSWER- Must use 1/2 inch bolts
embedded 7 inches into the concrete.
,2|Page
Sole Plate bolt spacing - ANSWER- Bolts should be spaced no more
than 6 feet on center.
Sole Plate positioning - ANSWER- The sole plate must be within 12
inches of the end of the plate.
Foundation Elevation - ANSWER- The top of the foundation must be at
least 12 inches above the street gutter.
Grade Slope from Foundation - ANSWER- Must slope away at 2% for
the first 10 feet.
Footings for Wood - ANSWER- Require stone no greater than 3/4 inch.
Frost Protection (Corners) - ANSWER- In severe weather areas,
insulation for frost protection must extend 60 inches away from the
corner of the foundation.
Soil Classifications - ANSWER- Defined by the Unified Soil
Classification System.
Concrete Foundation Wall Thickness (Seismic Category D) -
ANSWER- If no more than 4 feet 6 inches high, a 6-inch concrete
foundation wall is allowed (normally 7 1/2 inches).
Rubble Stone Foundation - ANSWER- Minimum thickness is 16 inches.
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Hollow Masonry Unit (CMU) Piers (Filled) - ANSWER- Can be 10
times the minimal thickness in height (e.g., a 16x16 inch pier can be 160
inches high).
Drainage Tiles (Crushed Stone) - ANSWER- Need 2 inches of crushed
stone under them.
Drainage System Extension - ANSWER- Must extend 1 foot beyond the
outside edge of the footing.
Vapor Retarders (Polyethylene) - ANSWER- Always 6 mil thick for
basements.
Damp Proofing - ANSWER- Anything allowed for waterproofing can
also be used for damp proofing (e.g., 60 mil flexible polymer cat).
Minimum Post Dimensions for Wood post - ANSWER- 4x4 inches.
Minimum Post Dimensions for Steel post - ANSWER- 3x3 inches or 3-
inch round diameter.
Crawl Space Ventilation - ANSWER- 1 square foot of required openings
for every 150 square feet of foundation area.
