Why Home Hardening Matters

Embers can lodge in vents, under decks, in gutters, or against siding and ignite dry materials inside or on the structure. Hardening closes these vulnerabilities and uses materials that resist ignition or burn more slowly. Research from the Insurance Institute for Business & Home Safety (IBHS) shows that multiple hardening features together significantly improve survival rates.

Key Home Hardening Principles and Best Practices

Focus first on the areas closest to the home (especially the first 5–10 feet and attachments like decks). Prioritize low-cost, high-impact actions before major retrofits.

1. Roof (Highest Priority)

• Use a Class A fire-rated roof (the highest rating) — asphalt composition, metal, concrete tile, or clay tile. Avoid wood shakes or shingles.
• Keep the roof and valleys clear of leaves, needles, and debris.
• Install noncombustible or ember-resistant gutters and downspouts; consider gutter guards or covers.
• For new construction or major re-roofing, follow local WUI codes (some Colorado areas have enhanced requirements).

2. Vents and Openings (Critical for Ember Protection)

• Screen attic, roof (soffit/eave), foundation, and crawlspace vents with 1/8-inch corrosion-resistant metal mesh. Standard 1/4-inch mesh is too large — embers can pass through it.
• Consider ember- and flame-resistant vent products (some listed for California Chapter 7A standards; check compatibility in Colorado).
• Enclose open areas under decks, stilt foundations, or cantilevered sections with mesh or noncombustible siding.

3. Windows, Doors, and Glazing

• Use tempered glass (multi-pane recommended — double or triple). Single-pane windows can break from heat, allowing embers inside.
• Upgrade to ignition-resistant frames where possible.
• For higher-risk areas, consider metal shutters or other protections (less common in Colorado retrofits).

4. Siding and Exterior Walls

• Maintain 6 inches of vertical clearance between the ground and the bottom of exterior siding (use noncombustible material like fiber cement or metal in this gap).
• Prefer noncombustible or ignition-resistant siding (fiber cement, stucco, metal). Avoid highly combustible options close to the ground.
• Seal gaps and intersections with proper flashing.

5. Decks, Porches, and Attachments

• Use ignition-resistant decking materials (especially walking surfaces).
• Enclose the underside of decks or screen with 1/8-inch mesh.
• Remove combustible storage under decks.
• Keep decks clear of furniture, planters, and debris.
• Replace or separate combustible fencing/gates within 5 feet of the home (use metal or noncombustible materials for the first section).

6. Other Structural Elements

• Clear debris from roofs, gutters, and decks regularly (especially before fire season).
• Store firewood, lumber, and other combustibles at least 30 feet away (ideally uphill and not under decks).
• Address propane tanks, gas meters, and other utilities — keep vegetation cleared 10+ feet around them.
• For new builds or major additions in Colorado’s Wildland-Urban Interface (WUI), some jurisdictions apply tiered “Class 1 or Class 2 Hardening” requirements based on fire intensity zones (covering roofs, walls, eaves, decks, glazing, etc.).

Colorado-Specific Notes

• The CSFS Home Ignition Zone Guide is an excellent free resource with checklists and illustrations tailored to Colorado conditions.
• Many insurance companies recognize hardening and defensible space for potential premium discounts or continued coverage.
• In steeper or heavily forested areas like around Steamboat Springs (Routt County), combine hardening with extended defensible space on slopes.
• Local fire protection districts or the Colorado State Forest Service can often provide site visits or referrals to qualified wildfire mitigation professionals.

Implementation Tips

• Start simple and cheap: Clear debris, install vent mesh, create the 6-inch noncombustible base clearance, and maintain gutters — these can make a big difference quickly.
• Retrofit vs. New Build: New construction allows easier integration of hardened features. For existing homes, prioritize roof, vents, and Zone 0 (0–5 feet) first.
• Maintenance is ongoing: Even hardened homes need regular upkeep — especially clearing ember traps before dry, windy seasons.
• No single feature is enough: The best protection comes from layering multiple measures (roof + vents + defensible space + siding upgrades).

Home hardening does not guarantee survival in every wildfire, but it dramatically improves your home’s odds — often allowing it to withstand ember attacks even when firefighters cannot reach every property.