Basement Water Intrusion & Building Envelope Assessment – North York
This project involved a structural Building Condition Assessment (BCA) of a two-storey residential building, with a focus on basement water intrusion and building envelope performance.
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Parsways was retained to assess structural and envelope-related deficiencies affecting moisture ingress, including ICF foundation walls, window wells, cladding interfaces, and site drainage conditions, in accordance with Ontario Building Code requirements.
Location: North York, Ontario
Completion: 2023
Sector: Residential Building
1. The Challenge
Although the building was relatively new, persistent basement water intrusion was reported. The source of moisture was not immediately apparent and required a systematic condition assessment.
This presented two primary technical challenges:
Multiple Water Entry Paths:
Potential ingress points included window wells, foundation penetrations, roof drainage discharge, and transitions at the building envelope and cladding systems.
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Envelope and Foundation Interface:
The use of ICF foundation walls and limestone cladding required careful review of waterproofing continuity, weep provisions, and detailing at penetrations and terminations.
2. The Engineering Solution
A structured structural BCA was completed using visual inspection, field measurements, and crack width readings, with reference to OBC drainage, damp-proofing, and envelope performance provisions.
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a. Foundation and Basement Assessment:
ICF foundation walls, basement finishes, and window wells were reviewed to identify moisture pathways and material distress associated with water ingress.
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b. Envelope and Drainage Review:
Limestone cladding, flashing details, balconies, roof runoff, gutters, downspouts, grading, and sump discharge were assessed to evaluate moisture demand on load-bearing elements.
3. The Outcome
Parsways delivered a stamped Building Condition Assessment report documenting observed deficiencies and their contributing mechanisms. Clear, code-aligned recommendations were provided to support targeted remedial design, improved drainage control, and long-term envelope and structural durability.