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10-2-3 Chimney Rule
Exam Prep

The 10-2-3 Rule and Other Chimney Facts That Show Up on Every B1 Exam

Chapter 10 is short. Examiners love it. Here are the five chimney and fireplace requirements that appear on the B1 exam more than any others.

John Calloway  ·  July 2026
4-inch sphere rule for deck railing safety
Why Codes Were Made

The Four-Inch Sphere: A Number Written in Children’s Lives

Why does the IRC require that no guard opening allow a 4-inch sphere to pass through? The answer spans three decades of code tightening — from 9 inches to 6 to 4 — driven by real CPSC data on child head entrapment.

John Calloway  ·  July 2026
Load Path
From the Field

From the Field — When “Just Getting It Done” Breaks the Load Path

A contractor bridged 2×4 blocks over anchor bolts instead of adjusting the stud layout. It was everywhere in the house. Here is why it fails, what the code says, and the fix that actually works.

John Calloway  ·  July 2026
DOE vs ICC Energy Code Dispute
Code Watch

DOE vs ICC: The $127 Billion Energy Code Dispute

DOE says the 2024 energy code adds $14K per home. ICC says DOE is ignoring $182 billion in energy savings. Here is what inspectors and builders need to know about the standoff.

John Calloway  ·  July 2026
SC Adopts 2024 IRC
Code Watch

South Carolina Adopts the 2024 IRC — What Every Lowcountry Inspector Needs to Know

The 2024 IRC is now South Carolina law. Here is what changed, what it means for inspectors, and the key sections you need to know before your next inspection.

John Calloway  ·  June 2026
Imaginary Lot Lines
Code Watch

What Are “Imaginary Lot Lines” in the 2024 IRC? A Field Guide for Inspectors

The 2024 IRC expanded the imaginary lot line concept to all dwellings on the same lot — not just townhouses. Here is what that means for your fire separation inspections.

John Calloway  ·  July 2026
SC Farm Stand Bill
Code Watch

SC’s Farm Stand Bill: Three Perspectives on What H5097 Really Means

Signed into law May 15, 2026 with a unanimous vote — but unanimous doesn’t mean uncomplicated. Three perspectives: the farmer, the jurisdiction, and ours.

John Calloway  ·  June 2026

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