"Chimney Seismic Steel, Ties and Strap Anchors" is lesson 4 of 8 in the Masonry (C-29) Learning Hub. It opens with "When the Seismic Rules Apply" and works through 5 short steps, then a worked example you can check yourself against.
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Steps in this lesson
When the Seismic Rules Apply
Vertical Bars: Count by Width
Horizontal Ties
Strap Anchors at Floors, Ceilings and Roof
Footing and Corbeling
The worked example in the course applies this lesson to a realistic job in 5 steps, from "Do the seismic rules apply?" through "Size the footing".
What you'll be able to do
Explain the main idea of "Chimney Seismic Steel, Ties and Strap Anchors" in plain language you can use on the exam.
Apply this step with confidence: "Horizontal Ties".
Apply this step with confidence: "Strap Anchors at Floors, Ceilings and Roof".
Apply this step with confidence: "Footing and Corbeling".
Test yourself on the worked example and the quick-check quiz inside the classroom.
The diagram for this lesson, exactly as it appears in the Learning Hub.
The first steps of this lesson
Step 1: When the Seismic Rules Apply
Under 2025 CRC R1003.3, masonry and concrete chimneys in Seismic Design Category C, D0, D1 or D2 must be reinforced and anchored as detailed in R1003.3.1, R1003.3.2 and R1003.4. In Seismic Design Category A or B, reinforcement and seismic anchorage are not required. CBC 2113.3 says the same for A and B, applies 2113.3.1, 2113.3.2 and 2113.4 to C and D, and sends categories E and F to the engineered masonry provisions of CBC 2101 through 2108. Find the category on the plans before you order steel.
Step 2: Vertical Bars: Count by Width
For a chimney up to 40 inches wide, place four No. 4 continuous vertical bars anchored in the foundation, in the concrete, between wythes of solid masonry or in the cells of hollow units, and grout them (R1003.3.1). For a chimney more than 40 inches wide, add two more No. 4 bars for each additional 40 inches of width or fraction thereof. Keep the grout from bonding to the flue liner so the liner is free to move with thermal expansion. For a chimney serving a masonry fireplace, R1001.3.1 and Table R1001.1 also add two No. 4 bars for each additional flue.
The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.
Independent exam preparation. Contractors Classroom is not affiliated with the Contractors State License Board, and no course can guarantee a passing result.
