Clearance testing in Kensington: what to know
Kensington's Victorian bungalows and Craftsman homes from the 1900s–1930s are among the oldest residential stock in Montgomery County — original wood-lath plaster, cedar shingle roofs, and minimal attic insulation create a high-mold-risk profile in wet or humid conditions.
Many Kensington properties have root-damaged drain lines and aging cast-iron plumbing — slow underground leaks can saturate basement framing over months before discovery, producing extensive Stachybotrys growth behind finished surfaces.
Mold conditions in Kensington
Common mold types in this area: Penicillium (plaster walls with historic moisture infiltration); Cladosporium (wood exterior trim and cedar shingle substrate); Stachybotrys (basement framing from root-damaged drain lines); Chaetomium (water-damaged wood lath plaster).
We serve Kensington Town Hall, Noyes Library for Young Children, Kensington Antique Row (Howard Avenue), Rock Creek Trail (nearby) and the wider Kensington area across ZIP codes 20895.
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 Kensington
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.