§ Chapter 5 IRC 2018
Floors
10 entries from Chapter 5 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
R317.1
Wood Touching Concrete — Pressure-Treated Requirements — IRC 2018
R317.1
When does wood touching concrete need to be pressure-treated?
When does wood touching concrete need to be pressure-treated?
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R502.3
Floor Joist Span Limits — IRC 2018
R502.3
How far can floor joists span under the IRC?
How far can floor joists span under the IRC?
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R502.3.3
Floor Joist Cantilever Limits — IRC 2018
R502.3.3
How far can floor joists cantilever past a beam or foundation?
How far can floor joists cantilever past a beam or foundation?
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R502.5
Floor Girder and Beam Span Requirements — IRC 2018
R502.5
How big does a girder or beam need to be under a floor?
How big does a girder or beam need to be under a floor?
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R502.6
Floor Joist and Beam Bearing Requirements — IRC 2018
R502.6
How much bearing do floor joists, beams, or girders need on wood, steel, masonry, or concrete?
How much bearing do floor joists, beams, or girders need on wood, steel, masonry, or concrete?
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R502.7
Floor Joist Blocking and Bridging Requirements — IRC 2018
R502.7
Do floor joists need blocking or bridging at supports?
Do floor joists need blocking or bridging at supports?
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R502.8
Drilling and Notching Floor Joists — IRC 2018
R502.8
Can I notch or drill holes in floor joists for plumbing or wiring?
Can I notch or drill holes in floor joists for plumbing or wiring?
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R503.2
Floor Sheathing Thickness for Joist Spacing — IRC 2018
R503.2
What thickness subfloor is required for floor joists spaced 16 or 24 inches on center?
What thickness subfloor is required for floor joists spaced 16 or 24 inches on center?
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R507.5
Deck Joist Span Requirements — IRC 2018
R507.5
How far can deck joists span under IRC 2018?
How far can deck joists span under IRC 2018?
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R507.6
Deck Beam Bearing on Posts — IRC 2018
R507.6
What does IRC 2018 require for deck beam bearing on posts?
What does IRC 2018 require for deck beam bearing on posts?
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§ 02 Chapter navigation