Owner, General Contractor · Updated November 06, 2026
If your home has wood siding, eaves or fences, there are two ways to make them harder to ignite: coat them with an intumescent fire-retardant paint, or replace them with noncombustible materials like fiber cement, stucco or metal. As a builder, here's how I explain the choice to homeowners.
At a glance
| Intumescent coating | Noncombustible siding | |
|---|---|---|
| What it does | Swells into an insulating char, up to 20 times its dry thickness, when heated (Riverside Fire) | Doesn't burn |
| Keeps your existing look | Yes, it goes on like paint | No, the exterior changes |
| Counts for California's wildfire building code | No. You can use it, but not to meet Chapter 7A (Riverside Fire) | Yes, when it meets Chapter 7A |
| Weather | Can lose effectiveness with weather exposure, so it needs inspection and recoating | Long-lasting |
| Disruption | Days | Weeks, with permits |
| Cost | Lower | Much higher |
When coating makes sense
- You love the look of your wood siding or shingles and aren't remodeling.
- You want to protect fences, decks, trim and eaves that won't be replaced soon.
- You want protection this season, not after a permit cycle.
A coating is an added layer, not a code solution. It protects the surfaces you have while you plan bigger upgrades. Read how intumescent paint works.
When new siding makes sense
- You're remodeling or rebuilding, especially after the Palisades or Eaton fires. The permit will require Chapter 7A materials anyway. See rebuilding after the fires.
- Your siding is old, damaged or due for replacement.
- You want the hardening to count for code and insurance without upkeep.
IBHS found that after the 2025 LA fires, homes with noncombustible siding plus a Class A roof, double-pane windows and enclosed eaves had a 54 percent chance of avoiding damage, versus 36 percent for homes with one of those features (IBHS).
Our approach
Most of our clients do both over time: coat the wood they have now, then switch to noncombustible materials when a remodel comes up. Either way, clear the first five feet around the house, because burning plants and furniture next to the wall defeat any siding. See the five-foot zone and our fire-retardant coating service.
Coat, replace or both? We'll walk your home and price both paths. Book a free assessment.
Frequently asked questions
Does fire-retardant paint count toward California's building code?
No. California homeowners can use intumescent coatings, but they can't rely on them to meet the wildfire requirements of Chapter 7A.
How long does intumescent paint last outdoors?
It depends on the product and exposure. Weather reduces effectiveness, so plan on regular inspection and recoating per the manufacturer.
Is fiber cement siding fire-resistant?
Fiber cement is noncombustible and is widely used to meet Chapter 7A. Check the specific product listing for your project.
By Craig Weeks
