Case Study · Landlord / Habitability Concerns·Fredonia, NY · 2024
A Fredonia NY tenant complaint about chronic basement mold in a 1955-construction rental property. Independent testing supports tenant's habitability claim; landlord's remediation contractor scope is expanded after the testing finding.
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A Fredonia tenant in the second year of a 2-year lease on a 1955-construction single-family rental had filed a habitability complaint with the property's owner-landlord citing chronic basement musty odor, visible black-spot growth on basement walls, and an asthma diagnosis the tenant attributed to indoor mold exposure. The landlord disputed the claim, citing a prior visual inspection by a contractor that found 'minor surface mold consistent with normal basement aging in WNY.'
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We were retained by the tenant on independent testing. Methodology identical to what we'd have used had the landlord retained us. The tenant paid the engagement fee directly. We did not communicate with the landlord or the landlord's contractor during the engagement.
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Field protocol: thermal imaging of the foundation walls revealed sustained moisture penetration along 22 linear feet of the north-facing concrete wall; moisture meter readings at 28-34% on concrete (saturated). Spore-trap air sampling at 4 indoor locations + outdoor baseline. Surface tape-lift at 3 visible-growth points on the foundation wall. Bulk sample of efflorescent material at the wall-floor joint.
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Spore-trap air analysis returned Aspergillus/Penicillium at 6,400 sec/m³ in basement (outdoor baseline 240 sec/m³) plus Stachybotrys chartarum at 320 sec/m³ in basement (outdoor baseline 0). Surface tape-lifts confirmed Stachybotrys colonies on the foundation wall. Bulk sample contained Chaetomium globosum colony fragments. Multiple species + sustained-moisture-required species pattern indicated chronic, not acute, contamination.
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Thermal imaging + moisture readings + species pattern collectively pointed to chronic foundation seepage from below grade. The north-facing wall is downhill on a lake-effect slope where snowmelt + groundwater infiltrate through the original (1955) concrete foundation without modern waterproofing. This was a building-system failure, not a tenant-caused moisture event.
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Our report identified the species, exposure levels, source analysis, and a scoped remediation work plan: foundation waterproofing (exterior excavation + membrane install + drain tile), interior mold removal under containment per ANSI/IICRC S520, and post-remediation clearance testing. Estimated work scope: $14,000-$22,000 depending on contractor selection.
Outcome
The landlord-tenant matter settled out of court. The landlord agreed to perform the full waterproofing + remediation scope (work was completed by a PACNY-member contractor for $18,400), the tenant received a 3-month rent abatement during construction, and the lease was renewed for a 5th year at the prior rent rate after our independent clearance testing confirmed acceptable conditions post-remediation.
— — Takeaway
Chronic basement moisture in WNY pre-1960 housing stock is a building-system issue more often than it's a tenant-caused issue. Independent testing with multiple species + species-pattern analysis distinguishes chronic from acute and supports an honest scope conversation between landlord and tenant. Both parties typically settle when the data is independent.
Related
Same protocol applied across different scenarios. Browse the full archive or explore the landlord / habitability concerns hub.
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