American Truck Leasing, Inc. v. Thorne Equipment Co.
400 Pa. Super. 530 · Superior Court of Pennsylvania · 1991
Facts
A fire started in combustible trash on Dorothy Gross's vacant property, spreading to a neighbor's building and damaging an elevator shaft. After the fire was extinguished, a demolition contractor, hired to remove the damaged shaft, caused further damage to American's property. American sued Gross, alleging her negligence in maintaining her property was a cause of their harm.
Issue
Was the property owner's alleged negligence in allowing trash to accumulate a substantial factor in causing damage to a third party's property, when the damage occurred the next day due to an independent demolition contractor's actions after the initial fire was extinguished?
Holding
The court affirmed the dismissal, holding that the property owner's alleged negligence was not a substantial factor in causing the plaintiff's harm due to the intervening act of the demolition contractor.
Rule
For negligence to be a legal cause, it must be a "substantial factor" in bringing about the harm, considering factors like other contributing forces, continuous operation of the conduct, and lapse of time. An independent, intervening act can break the chain of causation if the original negligence is too remote.
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