Mold Remediation Decision Tree for Sick People

Should you stay? DIY? Hire pros? How to decide safely

≈ 2 min read

Educational only, not medical advice. This guide shares general information and community experience. It isn’t a diagnosis or a treatment plan. Please talk with your doctor or another licensed healthcare provider before starting, stopping, or changing any test, supplement, medication, or treatment.

Mold Remediation Decision Tree

1. Is the house safe enough to stay in right now?

Yes → Low visible mold, no musty smell, symptoms stable → Proceed to testing/remediation planning
No → Visible mold, strong musty odor, symptoms worsen indoors → Consider leaving as soon as you can (even temporarily); CIRS practitioners call removing exposure the most critical step

2. Do you have ERMI / HERTSMI-2 results?

HERTSMI-2 under 11 → “Statistically safe for re-entry for those with CIRS”
HERTSMI-2 11–15 → “Borderline; clean first and re-test before re-entry”
HERTSMI-2 over 15 → “Dangerous for those with CIRS. Do not enter.”
ERMI → Shoemaker-trained clinicians generally use below 2, and sometimes a lower target for very sensitive patients. Ask your practitioner which target applies to you.

The HERTSMI-2 bands are Dr. Ritchie Shoemaker’s published scale (Surviving Mold). His team notes it “is a building index” and “does not replace careful observation of symptoms.” These scales come from one clinical group and haven’t been independently validated. EPA says ERMI is a research tool not validated for routine use.

3. Budget & Severity

Low budget / mild symptoms

HEPA air purifiers + dehumidifier
DIY cleaning of hard surfaces
Discard soft items that smell
Post-cleaning ERMI re-test

Moderate–high budget / severe symptoms

Hire IICRC-certified remediator
Full containment + HEPA vacuum
Remove/replace porous materials
Post-remediation clearance testing

4. Post-Remediation Rules

Repeat ERMI/HERTSMI-2 2–4 weeks after work
Keep humidity <50% year-round
Use carbon + HEPA filters ongoing
If symptoms return → re-test or consider relocation

Cost vs. Thoroughness (Rough Guide)

Approach	Approx. Cost	How thorough (not evidence-graded)	Best For
HEPA purifiers + dehumidifier only	$300–800	Medium (containment)	Temporary / low budget
DIY cleaning + discard soft goods	$200–1,000	Medium–Low	Mild cases
Professional containment + HEPA vac	$1,500–5,000	High	Moderate exposure
Full professional remediation (remove/replace)	$5,000–20,000+	Very High	Severe / chronic exposure

The ratings above are a rough guide to how thoroughly each approach deals with mold, not a measure of health benefit for CIRS or MCAS. CIRS practitioners often suggest testing before and after remediation. The CDC and EPA don’t recommend routine mold testing for most homes, so ask your practitioner or inspector what makes sense for you (see our Mold Toxicity guide).