How odor persists
- Porous materials absorb VOCs into fiber structure
- Off-gassing continues for months
- Heat and humidity cycles re-release odor
- HVAC redistribution keeps odor circulating
Remediation methods
Surface cleaning (first pass)
- Wipe-down of hard surfaces
- Vacuum with HEPA
- Effective on non-porous only
Ozone treatment
- Oxidizes VOCs at surface
- Limited penetration
- Multiple treatments often needed
- Health precaution (clear space during treatment)
Thermal fogging
- Heated fog penetrates porous materials
- More effective than surface methods
- Still limited on dense porous
Hydroxyl generation
- Oxidative cleaning, safer than ozone
- Extended treatment time
Encapsulation
- Sealing surfaces to trap odor
- Often used with drywall before painting
- Not permanent
Replacement
- Only permanent solution for heavily contaminated porous materials
How to document odor
- Initial odor assessment by IH
- Post-remediation odor re-assessment
- Residual odor documentation (specific rooms, materials)
- Olfactory evaluation notes
- VOC testing if contested
Claim argument for replacement
When cleaning + ozone + thermal fogging still leaves odor:
- Porous materials must be replaced
- Sealed / encapsulated surfaces eventually fail
- Occupant health considerations
- Long-term livability standard