Building codes give a roof three fire ratings, and Class A is the top one. Santa Clarita does not put one rating on the whole city. Your address and the scope of the work decide which rule applies.
We handle reroofs in Santa Clarita, so we read these code rules before we plan an assembly. The local rules are short, but they decide the covering you can put on a roof here.
Class A roofing depends on the project and the location
The current Santa Clarita building code splits roof work into two situations. Outside the mapped fire hazard and wildland-urban zones, a new covering must be at least Class B. The minimum covers roofing put on during a repair, an alteration or a full replacement.
Inside a mapped Fire Hazard Zone, the applicable California Wildland-Urban Interface Code provisions govern the building. Roof covering repair or replacement there also follows the City's amended Chapter 15. The stricter wildfire rules come from both, not from Chapter 15 alone.
So the answer depends on the mapped status of your address and on the scope of work. Ask City Building and Safety to confirm both before you choose a covering.
Both of those checks come before a full roof replacement here. They also shape the roofing work we do across Santa Clarita and nearby cities in Los Angeles County. A tile reroof and a flat-roof job land in front of the same code rules.
Check the current fire hazard map
California keeps the current fire hazard severity zone maps at the Office of the State Fire Marshal. Those maps sort land into moderate, high and very high hazard. The state updated those maps in 2025, so open the live version rather than an old copy.
The Fire Marshal also says these maps measure hazard, not risk. A mapped zone describes conditions across an area, so it does not grade your building. You still need a real review of your own roof before you choose a covering.
The City also posts a fire hazard map in its GIS map gallery. GIS is just the City's public mapping system. The City says its maps are informational and not legal documents.
The file linked there carries a 2022 timestamp, so we treat it as background. For a live answer on one parcel, check the state maps and call City Building and Safety. The City lists fire, flood and topography among the site conditions it wants checked in the field.
Roof requirement screening table
Use the table below to sort your own project before anyone quotes a covering or orders material. Each row names the question, the official record that answers it, and the limit on that record.
| Reader situation or question | What to prepare or confirm | Official source | Scope or date limitation |
|---|---|---|---|
| Identify the property and its current mapped zone | Your exact address and the hazard zone returned for it today | California OSFM fire hazard severity zone maps and data | Maps show hazard, not risk; confirm the current map version and the agency with jurisdiction |
| Check the local minimum outside the mapped wildfire scope | The class of the covering proposed for the work | Santa Clarita Building Code, 2025 edition, roof covering rules | Class B minimum rule sits outside the mapped fire hazard and wildland-urban scope; the 2025 edition covers applications from January 1, 2026 |
| Identify the rules that apply inside a mapped zone | Whether the City places the parcel in a Fire Hazard Zone | Santa Clarita Building Code, 2025 edition, applicable wildland-urban interface provisions plus amended Chapter 15 | Covers roof covering repair and replacement in the mapped zone; the City confirms the parcel |
| Separate the project scope and the roof area it touches | How much covering the job replaces and whether the deck is exposed | City of Santa Clarita Building and Safety, Permit Center | The City sets permit scope, inspections and fees for the work |
| Verify the documents for the complete proposed assembly | The listing that covers deck, underlayment and covering together | Assembly listing tested to ASTM E108 or UL 790 | One product data sheet does not prove the class of the installed assembly |
Outside the mapped wildfire scope
Outside the mapped fire zones, the local rule sets a Class B minimum for the covering you install. The wildland-urban interface is the band where houses sit next to open wildland. A higher rated assembly stays allowed, because the rule sets only a floor.
Mapped zones and project-specific rules
Inside a mapped Fire Hazard Zone, wildland-urban interface provisions govern the building, and roof-covering repair or replacement follows Chapter 15. State wildfire rules reach the lands the Fire Marshal maps as high or very high hazard. Cities here sit in local responsibility areas, where a local agency carries fire protection duty.
The class your project needs there still comes from a current code review at your address. Confirm the mapped status with the City before you treat your property as outside that scope.
The roof assembly and its fire rating
A fire rating belongs to the complete tested assembly, so one product alone cannot carry it. Labs test the whole assembly against ASTM E108 or UL 790, and the rating follows that tested set. That means the deck, the underlayment and the covering all sit inside the rating together.
Underlayment is the waterproof layer that sits under the tile or the shingle. The listing is the paperwork that records which layers a lab tested together. Swap one layer for a cheaper substitute and that listing may no longer describe your roof.
Keep that listing with your project records, because it describes the roof a lab actually tested.
The City code also reaches the deck that sits under the covering. Spaced sheathing means the deck boards carry gaps between them, and the code calls for new solid sheathing there. An old wood shake or wood shingle surface comes off completely, down to the deck, before new roofing.
A reroof inspection follows that removal, or comes before new roofing when the job covers an old layer. We repair or replace damaged decking before the new roof goes on. When an owner wants the deck checked first, we schedule a roof inspection before the covering comes off.
Questions before you choose a roof covering
A short list of questions keeps the covering choice honest before anyone orders material. Ask the City counter first, then ask us to match those answers to the proposed assembly.
Application date matters because the City applies the 2025 codes to submissions received on or after January 1, 2026. Earlier submissions stay with the 2022 codes, so an older set of plans can follow a different rule.
We help property owners pull the roofing permit through the City Permit Center when the work needs one. The City reviews the application, sets its own fees, and tells you which inspections it wants. Call us with the address and the scope, and we will walk through the rules with you.
- Which code edition applies to my application date, the current one or the earlier set?
- Is the property inside a mapped Fire Hazard Zone right now, and who confirms that?
- Which covering class does this scope of work require at this address?
- Does the proposed assembly carry a listing that covers the deck, the underlayment and the covering?
- Does this job need a permit, and which inspections does the City want on site?
Common questions about Class A roof rules
Does every Santa Clarita roof need Class A?+
No. Outside the mapped fire zones, the local rule sets a Class B minimum for the new covering. Inside a mapped Fire Hazard Zone, wildland-urban interface provisions and amended Chapter 15 can require Class A.
Where can I check the current fire-hazard map?+
Use the state Fire Marshal's current fire hazard severity zone maps and data for your exact address. Then confirm the result with City Building and Safety before you order a covering. The City's own map gallery is informational and does not settle a parcel.
Does one material prove the whole roof assembly complies?+
No. The rating belongs to the assembly that a lab tested to ASTM E108 or UL 790. Keep the listing that covers your deck, underlayment and covering.
Class A is a real requirement on some Santa Clarita roofs, and not a blanket rule for the city. Check the map route, read the code rule for your scope, then confirm both with the City.
Call us at (661) 367-8211 if you want help reading those rules for your own roof. Santa Clarita Roofing Contractors is a division of Home Vision Remodel. We work under CSLB #1112525.