Mold remediation in Passaic County, New Jersey

The river, the storms and the housing in Passaic County

Paterson flooded in the record Passaic flood of October 1903, in Hurricane Irene in August 2011 when the water reached levels the city had not seen in a century, and again in the remnants of Hurricane Ida in September 2021. Downstream in Passaic, Ida put six feet of water into a street and the city evacuated residents to City Hall. Upstream in Wayne and Little Falls the same river rises more slowly and sits for days.

Paterson, Passaic and Clifton are largely pre war brick and frame, with plaster on lath, stacked floors and finished basements that were never designed to be dry rooms. North and west of them, Wayne, Little Falls and the lake neighborhoods are postwar subdivisions and summer bungalows converted to year round houses, sitting on slab and shallow crawl space. A reading taken in one tells you nothing useful about the other.

Grading the water, and the 24 to 48 hour window

Water that has crossed ground, a street or a storm drain before it reached a house is category 3 under the ANSI IICRC S500 standard, the grossly contaminated category. That decision is made at the door and it changes the whole job. Porous materials the water touched come out: carpet, pad, porous subfloor and the lower band of drywall. Porous material exposed to category 3 water is removed whether or not growth has appeared yet.

The United States Environmental Protection Agency tells homeowners to dry water damaged areas and items within 24 to 48 hours to prevent mold growth. Inside that window, with material dried through rather than dry to the touch, growth is unlikely. Past it, assume growth until a meter says otherwise. A homeowner who has run a rented dehumidifier for two days on a category 3 basement has dried contaminated material into the room.

The visual inspection that scopes the work

A mold job is priced from three answers: where the water is coming from, which materials are affected, and what the work will take. The technician walks the affected rooms and the spaces behind and above them, uses a thermal camera to choose where to read, and writes moisture readings at fixed points so the same points can be read again later and compared. The report names the water source and the affected materials.

Where growth has started, the work follows ANSI IICRC S520, which describes three conditions: condition 1 is a normal fungal ecology, condition 2 is settled spores and fragments, condition 3 is actual growth. The condition sets the scope. A small patch of condition 3 inside a wall cavity takes more work than a wide film of settled dust across a basement ceiling, and the boundary between conditions is where the containment goes.

When sampling earns its cost, and when it does not

Air and surface samples are collected on site and read by a laboratory. A surface sample shows what is on or in a material. An air sample shows what was airborne in a room at the moment it was taken. Neither result tells you where the water came in, and the water is the question that decides whether the problem returns after the cavity has been closed back up.

Sampling is useful when growth is hidden, when a musty smell has no visible cause, when a sale or a tenancy needs a third party number, or when an earlier remediation is in dispute. Where growth is visible and the source has already been found, a sample mostly adds a laboratory figure to something already settled. Where an independent clearance is wanted after removal, book it in your own name.

Containment, negative air and HEPA filtration

Cutting colonized drywall out of a cavity puts far more into the air than growth sitting undisturbed on a wall, which is why the barrier goes up before the first cut. The work area is sealed and held under lower pressure than the rooms around it, so air moves inward while material is disturbed, and a HEPA air scrubber runs for the whole of the removal and filters what it pulls through.

Not every job needs the full setup. Settled spores and fragments in one corner are usually HEPA vacuumed and damp wiped with no barrier at all. Growth inside a wall cavity is where containment earns its cost. Where a heating and cooling system serves the room, it is shut down or isolated first, because a return running during removal carries that room's air into every room the system feeds.

What comes out, what is dried and kept, and what you hold at the end

Colonized porous materials come out. Drywall, insulation, carpet pad, ceiling tile and particle board hold growth inside their structure, and there is no dependable way to clean the inside of them in place. The cut runs back to a sound edge set by the inspection and the meter, because water travels up a wall and along a plate line with no regard for what looks neat. Framing, concrete, metal and tile are HEPA vacuumed and damp wiped.

EPA guidance is that a patch under about ten square feet, with the water source already corrected, can in most cases be handled by a homeowner, and a biocide such as chlorine bleach is not recommended as routine practice. Call when the area is larger, when growth is near the heating and cooling system, when the water was sewage or flood water, or when a cleaned spot returns. Appointments are taken at any hour.