Rooftop PV Fire Access: Pathways and Ridge Setbacks
"Rooftop PV Fire Access: Pathways and Ridge Setbacks" is lesson 3 of 6 in the Solar (C-46) Learning Hub. It opens with "Which Code Section Applies to the Roof" and works through 5 short steps, then a worked example you can check yourself against.
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Steps in this lesson
Which Code Section Applies to the Roof
Two 36-Inch Pathways from Eave to Ridge
Setback at the Ridge: 33 Percent and 66 Percent
Keep Panels Away from the Escape Window and Mind the Conduit
Compute the Percentage First, Then Draw the Setbacks
The worked example in the course applies this lesson to a realistic job in 5 steps, from "Find the array's share of the plan view total roof area" through "Cross-check the limit".
What you'll be able to do
Explain the main idea of "Rooftop PV Fire Access: Pathways and Ridge Setbacks" in plain language you can use on the exam.
Apply this step with confidence: "Setback at the Ridge: 33 Percent and 66 Percent".
Apply this step with confidence: "Keep Panels Away from the Escape Window and Mind the Conduit".
Apply this step with confidence: "Compute the Percentage First, Then Draw the Setbacks".
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: Which Code Section Applies to the Roof
Firefighters need walkable pathways, a clear ridge for smoke ventilation, and a way off the roof, so California sets minimum spaces around a rooftop PV array. For houses and townhouses built under the California Residential Code, use 2025 CRC Section R329.6. For Group R-3 buildings that are not built under the CRC, use 2025 California Fire Code Section 1205.2.1 (it repeats the same 36-inch pathways and 33-percent and 66-percent setback rules). For all other occupancies, use CFC Section 1205.3. CRC R329.6 is not required for roofs with a slope of 2 units vertical in 12 horizontal (about 17 percent) or less, for detached nonhabitable structures such as carports and detached garages, or where the enforcing agency decides rooftop operations will not be employed.
Step 2: Two 36-Inch Pathways from Eave to Ridge
CRC R329.6.1 requires not fewer than two pathways, on separate roof planes, from the lowest roof edge to the ridge, each not less than 36 inches (914 mm) wide, on all buildings. At least one pathway must be on the street or driveway side of the roof. For each roof plane that has an array, there must also be a 36-inch pathway from lowest edge to ridge on that same plane, on an adjacent plane, or straddling the two. Pathways must be over areas that can support firefighters and located where there are few obstructions such as vent pipes, conduit or mechanical equipment.
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.
