Mold Remediation FAQ

Mold remediation is the process of safely removing mold contamination from a structure and its contents, and restoring the property to a condition where mold is no longer present at harmful levels. The IICRC S520 standard governs professional mold remediation.

The process includes: assessment and air sampling, containment to prevent spread, removal of contaminated materials, HEPA vacuuming and antimicrobial treatment, and post-remediation clearance testing.

Allied Restoration's technicians hold the IICRC AMRT (Applied Microbial Remediation Technician) certification.

Common signs that indicate a mold problem in your San Francisco Bay Area home or building:

• Visible mold — discoloration on walls, ceilings, grout, or around windows
• Musty odor — a persistent earthy or musty smell, especially in bathrooms, basements, or after water damage
• Recent water damage — any area that was wet for more than 48 hours without professional drying
• Health symptoms — occupants experiencing respiratory symptoms, allergies, or headaches that improve when leaving the building
• Humidity above 60% — measured with a hygrometer; SF's coastal climate makes this common

If you're unsure, Allied Restoration offers professional mold inspections with air sampling and written reports.

Mold testing (inspection) determines whether mold is present, what species, and at what concentrations. Allied Restoration performs:

• Air sampling — spore trap cassettes sent to an accredited lab
• Surface sampling — tape lifts or swabs of suspected areas
• Moisture survey — thermal imaging and moisture meters to find hidden moisture sources
• Written report with lab results and recommendations

Mold remediation is the actual removal and treatment process that follows a positive test result.

For insurance claims and legal purposes, the inspection and remediation should ideally be performed by separate companies. Allied can perform both or refer you to an independent industrial hygienist for testing.

Mold spreads primarily through airborne spores — microscopic particles that travel through HVAC systems, air movement, and physical disturbance of contaminated materials.

This is why containment is critical before remediation begins. Allied Restoration installs negative air pressure barriers and runs HEPA air scrubbers to prevent cross-contamination during the remediation process.

In San Francisco's dense multi-unit buildings, mold from one unit can spread to adjacent units through shared wall cavities, plumbing chases, and HVAC systems — making prompt professional remediation especially important.

Coverage depends on the cause of the mold and your specific policy:

• Mold from sudden water damage (burst pipe, appliance failure) — typically covered under the water damage claim
• Mold from a covered storm event — usually covered
• Mold from gradual leaks or neglect — typically NOT covered
• Pre-existing mold — not covered

Some policies have specific mold coverage limits ($5,000–$10,000 is common). Allied Restoration provides Xactimate documentation for all mold remediation work, which is the industry standard format for insurance claims.

Call us at (415) 529-5637 — we work directly with all major carriers.

Timeline varies based on the extent of contamination:

• Small localized mold (bathroom, single room) — 1–2 days
• Moderate contamination (one floor or multiple rooms) — 3–5 days
• Extensive contamination (whole house or large commercial) — 1–3 weeks

After remediation is complete, Allied Restoration recommends post-remediation clearance testing by an independent industrial hygienist to confirm that mold levels are within acceptable limits before the space is reoccupied.

It depends on the extent of the contamination and the areas being remediated:

• Small, isolated areas — occupants can often remain if proper containment barriers are installed
• Extensive contamination or whole-house remediation — temporary relocation is strongly recommended for health reasons, particularly for children, elderly, or immunocompromised occupants
• During active demolition — always vacate the affected area

Allied Restoration will assess your specific situation and advise on whether temporary relocation is necessary. If you have renters insurance or a homeowner's policy, additional living expenses during displacement may be covered.

San Francisco's climate creates unique mold challenges that differ from most of the country:

• Year-round coastal fog — neighborhoods like Outer Sunset, Inner Richmond, and Twin Peaks have persistent marine layer that keeps humidity elevated
• Victorian and Edwardian housing stock — original wood framing, minimal vapor barriers, aging plumbing and roofing
• Limited natural ventilation — many SF apartments and condos have poor cross-ventilation
• Dense multi-unit buildings — plumbing leaks in one unit affect multiple floors
• Crawlspaces — many SF homes have unventilated or poorly ventilated crawlspaces that accumulate moisture

Allied Restoration has served San Francisco since 2010 and understands these local conditions better than any national restoration chain.

Clearance testing is post-remediation air sampling performed by an independent industrial hygienist (not the remediation company) to confirm that mold levels have been reduced to acceptable concentrations before the space is re-occupied or enclosed.

You should always request clearance testing when:

• The remediation was extensive
• An insurance claim is involved
• You're selling or buying the property
• Occupants have health sensitivities
• A landlord-tenant dispute is involved

Allied Restoration encourages independent clearance testing on all significant remediation projects — it protects both our work and your peace of mind.

Mold will return if the underlying moisture source is not eliminated. Remediation removes the existing mold — but if a roof is still leaking, a pipe is still dripping, or condensation is still forming, new mold growth will begin within days.

Allied Restoration always identifies and addresses the moisture source as part of the remediation process. This may involve:

• Referring a plumber for pipe repairs
• Improving ventilation in bathrooms or crawlspaces
• Installing vapor barriers
• Recommending roofing repairs

We also apply EPA-registered antimicrobial treatments to remediated surfaces as an additional preventive measure.