Wildfire Smoke & Your Attic: Protecting Indoor Air Quality in Spokane

As our community navigates the lingering impacts of recent wildfire activity across Spokane County—including the Old Trails, Fairview, and Autumn Lane fires—heavy smoke and fine particulate matter (PM2.5) continue to impact the Inland Northwest.

While most homeowners know to seal windows, close doors, and run indoor HEPA purifiers, there is one critical air infiltration pathway that is frequently overlooked: your roof's attic ventilation system.

If you are noticing a lingering smoke smell in your house, your roof ventilation may be drawing smoke into your living areas. Understanding how wildfire smoke interacts with your home's intake and exhaust vents can help you protect your family's indoor air quality without causing severe heat damage to your roof structure.

How Wildfire Smoke Infiltrates Through Your Roof

To prevent moisture buildup and prolong the life of your shingles, asphalt shingle roofing systems are engineered to breathe continuously through passive intake vents (located along your soffits) and exhaust vents (located along the roof ridge).

However, during heavy smoke events, this continuous airflow creates two distinct challenges:

1. Stack Effect Infiltration: As warm air naturally rises and escapes through your home, it creates negative air pressure on lower levels. Hot smoke and fine ash entering your soffit vents can be pulled down into your living areas through unsealed ceiling light fixtures, attic access hatches, exhaust fans, and drywall seams.

2. Attic Insulation Contamination: Blown-in fiberglass and cellulose insulation act like giant filters. Over prolonged smoke events, fine particulate matter settles deep into the insulation material, trapping acrid odors long after the outdoor skies clear.

3 Immediate Steps to Protect Your Indoor Air

If smoke levels remain elevated across the Spokane area, follow these practical steps to minimize smoke transfer from your roof deck to your living space:

Action Item	How It Protects Your Home	Maintenance Tips
Seal the Attic Access Hatch	Apply foam weatherstripping along the lip of your attic pull-down ladder or access hatch.	Stops rising attic smoke from sinking into upper-floor hallways.
Set HVAC to Recirculate	Ensure your central AC or heat pump is set to Recirculate Air rather than pulling in fresh outside air.	Upgrade to a MERV 13 furnace filter if your system manufacturer permits.
Do NOT Seal Roof Vents	Never cover or block your soffit, ridge, or gable vents from the outside.	Blocking airflow traps extreme summer heat, which warps shingles and damages wood sheathing.

Pro Tip: Check the backdraft dampers on your kitchen and bathroom exhaust fans. If a damper is stuck open, smoke trapped in the attic space can drift straight down into your bathrooms and kitchen.

Post-Smoke Evaluation & Emergency Roof Inspections

Once emergency personnel declare areas safe and local air quality improves, conducting a thorough post-smoke evaluation is essential for long-term home health:

• Ash & Soot Accumulation: Heavy layers of dark ash on asphalt shingles absorb excess solar heat and can clog gutters ahead of late-summer thunderstorms.

• Radiant Heat Damage: If active flames burned near your property line, intense radiant heat can soften, blister, or warp asphalt shingles even without direct flame contact. Learn more about our Emergency Roof Repair Services to address heat-damaged shingles early.

• Insulation Odor Checks: If a strong smoke smell persists after outdoor air quality recovers, your attic insulation may need professional evaluation or replacement.

Standing Strong with Spokane

As trusted local roofing contractors in Spokane, the team at Arrow Point Roofing is committed to helping our neighbors protect, repair, and rebuild their homes. Whether you need a post-storm evaluation, a ventilation audit, or a complete Class A Fire-Rated Roof Replacement, we are here to support you.

Contact the local experts at Arrow Point Roofing today to schedule your comprehensive roof evaluation!