ICC B1 smoke alarms, safety glazing and flame spread

What the outline says

ICC's B1 content outline lists 60 multiple-choice questions, a two-hour limit and an open book. The three topics are:

That is about four questions in total on a 60-question exam. Few are hard once you can find the sections.

Smoke detectors: three words to remember

The outline names installation, power supply and locations. Make those your checklist, and every smoke alarm question maps onto one of them.

• Locations. Where must alarms be present in a dwelling? Questions describe a floor plan and ask what is missing or misplaced.
• Power supply. What powers the alarm, and what happens if that power fails? Think about the source and the backup.
• Installation. How the alarms are mounted and how they relate to each other.

Carbon monoxide alarms are a related provision in the same area of the code. The outline's task names smoke detectors, so read the wording for your booking and your edition before deciding how much time to give them.

The trap here is the edition. The smoke alarm provisions moved to a different section number between the 2021 and 2024 IRC, according to ICC's published code books, so a tab from the wrong edition lands you on the wrong page. The 2021 versus 2024 guide and the tab list list both numbers.

Flame spread: a lookup about labels and ratings

Flame spread and smoke density are properties of finish materials, insulation and foam plastics. You do not calculate them. You check that the material has the rating the code asks for where it is used. A stem might describe foam plastic left exposed in a space, or a wall finish in a specific location, and ask whether it is acceptable.

The method is simple:

1. Identify the material: finish, insulation or foam plastic.
2. Identify where it is installed.
3. Find the requirement for that material and location in your book.
4. Compare it to what the question says is installed, and look at whether a cover or thermal barrier is described.

Because the topic spans finishes, insulation and foam plastic, the answers can sit in more than one chapter. The interior finish rules and the insulation rules are not in one place, so tab both. The chapter guide lists where.

Safety glazing: where and how it is marked

The outline says to verify that safety glazing is installed and labeled where required. It has two halves. One is location: glass in or next to doors, in certain wet areas and near stairs and floors is the kind of place the code looks at. The other is the label: the inspector looks for the permanent identification on the glass.

At 3%, this is worth about two questions. Candidates miss them because they know there is a rule but not which section holds the list of locations. Tab the safety glazing section and the list of hazardous locations as one tab, and practice finding it. The egress window guide is a useful read here because windows are where egress and glazing questions overlap.

A 20-minute drill

1. Open your IRC and find the smoke alarm section. Time it. If it takes over 90 seconds, add a tab.
2. Find the flame spread requirements for interior finish, then for foam plastic. Two lookups, two tabs.
3. Find the safety glazing locations list.
4. Repeat all three tomorrow. The timed lookup drill gives you a clock and a target pace.

The open book tips explain why the time you save on short topics goes to the hard ones.

Check the whole area, not just these three

These topics are small, so see how you score across the whole public safety area before you spend time here. Take the free 10-question check. It gives a score by area with no signup, and every answer is explained with the section it relies on. If a safety question trips you up, ask Plumb, the study assistant, to explain it. For timed practice exams and a study plan built from your exam date, see the plans.

Sources

• B1 Residential Building Inspector Content Outline, International Code Council: question count, time limit, open-book format, topic weights and the scope of each topic. IRC content is described in general terms only. Use your own copy for the text and section numbers.

FAQ

How much of the B1 is smoke detectors?

The outline gives smoke detectors 2%, about one question on a 60-question exam.

Does the B1 ask about safety glazing?

Yes. It is a 3% topic that asks you to verify safety glazing is installed and labeled where required.

Do I need to memorize the glazing locations?

No. The exam is open book. Know which section lists the locations and how to find it quickly.

Do smoke alarm section numbers differ by edition?

They can. Check the edition on your booking, then use the tab list for that edition.