Clearance testing in Yonkers: what to know
Yonkers' housing stock includes extensive pre-war multi-family apartment buildings and single-family homes built into the hillside terrain above the Hudson River, many dating from the 1900s–1950s — these older masonry and brick buildings have foundations and roofing that predate modern waterproofing standards, making basement and top-floor mold common.
The city's Hudson Valley climate brings four distinct seasons with humid summers and cold, snowy winters — freeze-thaw cycles and ice dam formation on older roofs are a recurring source of attic and wall-cavity moisture that becomes mold once the thaw sets in.
Yonkers' aging municipal water infrastructure, much of it installed in the early-to-mid 20th century, means main breaks and slow service-line leaks are more frequent than in newer municipalities, often saturating basement framing in multi-family buildings before a leak is reported.
Mold conditions in Yonkers
Common mold types in this area: Cladosporium (dominant outdoor species, elevated indoors from basement moisture); Penicillium/Aspergillus (older apartment basements and plaster walls); Stachybotrys chartarum (basement framing with chronic seepage or main-break moisture); Chaetomium (water-damaged plaster and drywall from roof or ice-dam leaks).
We serve Hudson River Museum, Philipse Manor Hall State Historic Site, Untermyer Park and Gardens, Empire City Casino at Yonkers Raceway, Yonkers waterfront on the Hudson River and the wider Yonkers area across ZIP codes 10710, 10701, 10703, 10704, 10705.
Signs you need clearance testing
- Remediation has been completed and containment is still in place
- The written protocol specifies clearance testing as a completion requirement
- A real estate transaction requires documented proof of successful remediation
- An insurance claim requires certified clearance documentation
- The remediator has offered to perform their own clearance (this should be declined)
- A previous clearance test failed and re-clearance is required after additional work
How we handle clearance testing in Yonkers
Clearance testing is the final step of any IICRC S520-compliant mold remediation and the critical quality control measure that confirms the work was done correctly. The clearance test must be performed by an independent licensed mold assessor — the company or individual that performed the remediation cannot perform their own clearance test. This independence is mandated by the NYS 2015 Mold Law and is best practice in all markets.
The timing and conditions of clearance testing are specified in the written remediation protocol. Standard protocol requires that containment remains fully in place when samples are collected, that the HEPA-filtered negative air machine has been running for at least 4 hours before sampling, and that an outdoor control sample is collected simultaneously with indoor samples.