The Minnesota Defect Library
The defects that actually decide deals in the Twin Cities metro — documented from the field, not a generic checklist.
Known failure modes.
Select a defect.
Ice Dams
One of the most common and damaging Twin Cities metro roof claims — causes ceiling stains, rot and mold if l…
OpenATTAttic Bypass Condensation
A hidden cause of roof-deck rot and 'mystery' attic mold in cold climates.…
OpenFOUFoundation Frost Heave
Distinguishes cosmetic cracks from structural movement that ends deals.…
OpenEXTNegative Grading
The single most common root cause of wet basements in the Twin Cities metro.…
OpenELEAluminum Branch Wiring
A recognized fire hazard that affects insurance and negotiation — common in Hennepin and Ramsey counties's 1…
OpenPLUClay Sewer Lateral
A concealed four-to-five-figure defect a standard inspection cannot see.…
OpenPLUPolybutylene Supply Piping
Often uninsurable; a major buyer-negotiation item in Twin Cities metro homes.…
OpenELEUndersized Electrical Service
Limits the home's usability and is costly to upgrade.…
OpenEXTImproper Deck Ledger Attachment
The leading cause of catastrophic deck collapse.…
OpenHVAHVAC Past Service Life
A major-system replacement is among the largest post-purchase surprises.…
OpenELEKnob-and-Tube Wiring
An insurance and life-safety concern requiring expert evaluation.…
OpenENVRadon Entry Pathways
Hennepin and Ramsey counties is a high-radon area; this is a health issue, not just a real-estate one.…
OpenEXTCedar & LP Siding Rot
A widespread 1990s-build defect that becomes a five-figure re-side if missed.…
OpenKnow the house
before you own it.
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