§ Chapter 4 IRC 2018
Foundations
10 entries from Chapter 4 of IRC 2018, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.
§ 01 Sections
All 10 entries.
Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.
Section
Title
Question
R403.1
Concrete Footing Size for a House — IRC 2018
R403.1
How wide and thick do concrete footings need to be for a house?
How wide and thick do concrete footings need to be for a house?
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R403.1
Foundation Footings on Undisturbed Soil or Fill — IRC 2018
R403.1
Do house footings have to sit on undisturbed soil, or can I pour on fill?
Do house footings have to sit on undisturbed soil, or can I pour on fill?
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R403.1.1
Foundation Wall Footing Edge Projection — IRC 2018
R403.1.1
How close to the edge of a footing can a foundation wall sit?
How close to the edge of a footing can a foundation wall sit?
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R403.1.3
Foundation Footing Rebar Requirements — IRC 2018
R403.1.3
When does a foundation need rebar or special reinforcement?
When does a foundation need rebar or special reinforcement?
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R403.1.4
Footing Depth and Frost Line Requirements — IRC 2018
R403.1.4
How deep do footings need to be below grade and below the frost line?
How deep do footings need to be below grade and below the frost line?
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R403.1.6
Sill Plate Anchor Bolt Spacing on Foundation — IRC 2018
R403.1.6
How are sill plates supposed to be anchored to the foundation?
How are sill plates supposed to be anchored to the foundation?
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R403.3
Frost-Protected Shallow Foundation Code Requirements — IRC 2018
R403.3
Can I use a frost-protected shallow foundation instead of digging below frost depth?
Can I use a frost-protected shallow foundation instead of digging below frost depth?
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R405.1
Foundation Drain Required for Basement or Crawl Space — IRC 2018
R405.1
Is a perimeter foundation drain required around my basement or crawl space?
Is a perimeter foundation drain required around my basement or crawl space?
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R406.1
Basement Foundation Wall Dampproofing Requirements — IRC 2018
R406.1
When does a basement foundation wall need dampproofing?
When does a basement foundation wall need dampproofing?
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R406.2
Foundation Waterproofing Required for High Water Table — IRC 2018
R406.2
When is waterproofing required instead of dampproofing?
When is waterproofing required instead of dampproofing?
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