Floors

Deck Beams Must Bear on Posts or Approved Connectors

What does the 2021 IRC require for deck beam bearing on posts?

R507.5

Deck Joist Spans Must Follow R507 Tables and Deck Loading

How far can deck joists span under the 2021 IRC?

R507.9

Floor Cantilevers Are Limited by Joist Size, Backspan, Load, and Bracing

How far can floor joists cantilever past a beam or foundation?

R502.3.3

Floor Girders and Beams Must Be Sized for Tributary Load and Span

How big does a girder or beam need to be under a floor?

R502.5

Floor Joist Holes and Notches Have Strict IRC Limits

Can I notch or drill holes in floor joists for plumbing or wiring?

R502.8

Floor Joist Spans Depend on Size, Species, Spacing, and Load

How far can floor joists span under the 2021 IRC?

R502.3

Floor Joists Need Restraint Against Rotation at Supports

Do floor joists need blocking or bridging at supports?

R502.7

Floor Joists, Beams, and Girders Need Minimum Bearing or Approved Hangers

How much bearing do floor joists, beams, or girders need on wood, steel, masonry, or concrete?

R502.6

Floor Sheathing Thickness Must Match Joist Spacing and Panel Rating

What thickness subfloor is required for floor joists spaced 16 or 24 inches on center?

R503.1

Wood in Contact With Concrete Often Needs Decay-Resistant or Treated Material

When does wood touching concrete need to be pressure-treated?

R317.1