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by Tyler Murphy

I. Introduction

Pennsylvania insurance law has long lacked definitive guidance on two critical doctrines that govern coverage disputes in property insurance cases: the Efficient Proximate Cause Doctrine and the ensuing loss clause. In Stella Property Development and Event Production, LLC v. Auto-Owners Insurance Company, No. 3:24-cv-60, 2026 WL 221489 (W.D. Pa. Jan. 28, 2026), the United States District Court for the Western District of Pennsylvania issued a thorough opinion that predicts how the Pennsylvania Supreme Court would define the contours of both doctrines. The court’s analysis represents the most recent authority to address the application of the Efficient Proximate Cause Doctrine and ensuing loss clauses under Pennsylvania law, with the opinion issuing on January 28, 2026. This article traces the historical development of these doctrines in the Commonwealth, analyzes the court’s holdings, and examines the practical effects of the decision on claims investigations and coverage litigation across Pennsylvania.

II. History of the Efficient Proximate Cause Doctrine in Pennsylvania

The Pennsylvania Supreme Court has never definitively ruled on the precise parameters of how courts should apply the Efficient Proximate Cause Doctrine (“EPC”) in property insurance disputes. The seminal case on the doctrine in the Commonwealth remains Trexler Lumber Co. v. Allemannia Fire Ins. Co. of Pittsburgh, 136 A. 856 (Pa. 1927), which involved a windstorm insurance policy covering the insured’s lumber sheds. In Trexler, the policy covered windstorm damage but expressly excluded loss caused by snowstorms, and the central question at trial focused on whether the collapse of the insured’s sheds resulted from a windstorm or from snow pressure on the roofs. See id. at 857-858. The Court affirmed a verdict for the insured and approved of a jury charge requiring the insured to prove that the windstorm was the “dominant and efficient cause” of the collapse, while rejecting the insurer’s argument that any degree of snow contribution would bar recovery. Id. at 858.

The Trexler Court grounded its holding in the principle that an insured peril need not be the sole cause of a loss to trigger coverage. The Court explained that even if snow pressure contributed to the collapse of the lumber sheds, “that would not defeat plaintiff’s right of action,” because “[w]here a windstorm, covered by the policy, was the efficient cause of the loss, the fact that other outside causes contributed thereto will not relieve the insurer.” Id. The Court drew a critical distinction between causes that are “dominant” and “efficient” and those that are merely “remote” or “incidental,” establishing a framework under which the insured peril must serve as the predominating cause of the loss. Id. at 857. This foundational principle has guided Pennsylvania courts for nearly a century, yet the Supreme Court has not revisited or refined the doctrine’s application in the modern property insurance context.

III. History of Interpretation of Ensuing Loss Clauses in Pennsylvania

The most substantive Pennsylvania case law interpreting ensuing loss clauses in insurance policies comes from a non-precedential opinion of the Pennsylvania Superior Court in Ridgewood Grp., LLC v. Millers Cap. Ins. Co., No. 1138 EDA 2016, 2017 WL 781620 (Pa. Super. Ct. Feb. 28, 2017). In Ridgewood, the Superior Court confronted an “all-risks” policy that excluded losses caused by negligent maintenance but contained an exception providing that if the excluded cause “results in a Covered Cause of Loss,” the insurer would pay for the resulting damage. Id. at *3-4. The court adopted the Sixth Circuit’s interpretation of ensuing loss clauses from TMW Enterprises, Inc. v. Federal Insurance Company, 619 F.3d 574 (6th Cir. 2010), which focused on foreseeability as the defining principle. Ridgewood, 2017 WL 781620, at *5. The Superior Court held that damages which “naturally and foreseeably arise from the excluded cause are excluded,” while non-foreseeable losses qualify for the ensuing loss exception and remain covered under the policy. Id. Applying this framework, the court concluded that water infiltration damage arising from a rotted roof and clogged gutter system constituted a “natural and foreseeable loss” and affirmed summary judgment for the insurer. Id.

Two Pennsylvania federal district courts have applied the ensuing loss framework outlined in Ridgewood. See Griggs Rd., L.P. v. Selective Way Ins. Co. of Am., 368 F. Supp. 3d 799 (M.D. Pa. 2019); Burgunder v. United Specialty Ins. Co., No. CV 17-1295, 2018 WL 2184479 (W.D. Pa. May 11, 2018). The Stella decision now stands as the third federal court to articulate this foreseeability test, reinforcing a growing consensus across the Commonwealth that foreseeability controls the ensuing loss analysis under Pennsylvania law.

IV. Stella Property Development and Event Production, LLC v. Auto-Owners Insurance Company

The dispute in Stella arose from a claim for roof damage to the Casimir Cultural Center in Johnstown, Pennsylvania, a building originally constructed in 1902. Stella, 2026 WL 221489, at *1. On June 21, 2021, a windstorm with estimated maximum gusts of 65 mph struck the area, and the policyholder’s inspector found extensive wind damage on nearly all facets of the roof while noting that the existing organic shingles were in “very poor condition.” Id. at *2. The insurer, Auto-Owners, retained its own inspectors and an engineer, who concluded that long-term deterioration, not a single wind event, caused the loss, and denied the claim under the policy’s wear-and-tear and inadequate maintenance exclusions. Id. at *2–3, 5.

The court first addressed the EPC doctrine, observing that it needed to predict how the Pennsylvania Supreme Court would rule given the absence of definitive guidance. Id. at *5–6. Distinguishing the EPC doctrine from the concurrent causation doctrine, the court noted that the EPC focuses on the predominant cause of a loss rather than permitting coverage whenever a covered peril serves as any concurrent proximate cause. Id. at *6. Relying on Trexler, the court concluded that “the Pennsylvania Supreme Court would apply the efficient proximate cause doctrine in that predominant-cause sense,” and held that Stella bore the burden of proving the windstorm was the “dominant and efficient” cause rather than a mere remote or incidental cause. Id. at *6–7. Because competing expert evidence existed on both sides, the court determined the question belonged to the factfinder. Id. at *7.

The court then turned to the ensuing loss clauses in both the wear-and-tear and maintenance exclusions. Id. at *7–8. Stella argued that the clauses restored coverage whenever an excluded condition and a covered peril combined to produce a single loss, but the court rejected this reading, agreeing with Auto-Owners that “the ensuing loss clause applies when an excluded condition results in the peril itself, and the Policy then pays for ‘the loss or damage caused by that’ ensuing peril.” Id. at *7–8. Because wear and tear, or inadequate maintenance, of the roof did not “result in” a windstorm but merely made the roof more susceptible to wind damage, the ensuing loss clause did not reinstate coverage as a matter of law. Id. at *8–10.

Although the court did not expressly invoke the foreseeability test in its primary ensuing loss analysis, the framework it applied achieves the same result. In Ridgewood, the Superior Court held that ensuing loss clauses restore coverage only for losses that do not “naturally and foreseeably arise from the excluded cause.” Ridgewood, 2017 WL 781620, at *5. The Stella court’s requirement that the excluded condition must actually “result in” the covered peril, rather than merely increase susceptibility to it, draws the same analytical line. Stella, 2026 WL 221489, at *8, 10. Under both approaches, damage flowing as a natural and foreseeable consequence of the excluded cause remains excluded, and coverage returns only when an independent covered peril produces separate, unforeseeable damage. The court acknowledged this alignment in footnote 21, citing Ridgewood and observing that “foreseeability is the lynchpin” of the ensuing loss analysis, while noting that even under Stella’s broader reading, unresolved factual disputes about the roof’s condition and the foreseeability of the claimed damage precluded summary judgment. Id. at *10 n.21.

V. Comment

The Stella court’s adoption of a “predominant cause” framework for the EPC doctrine carries significant practical consequences across Pennsylvania. Claim investigators should focus their efforts on identifying the single most dominant cause of a loss, elevating the role of experts and expert testimony in claims investigations and coverage litigation alike. If a court or jury finds that the predominant cause is a covered peril, the insurer must pay the claim regardless of contributions from excluded causes, but if the predominant cause is an excluded peril, the policyholder loses coverage through the exclusion and may turn to the ensuing loss clause as a narrow path to restore it—but only if the specific exclusion that defeats coverage actually contains an ensuing loss provision. Not all policy exclusions include such a provision, and the absence of one forecloses that path entirely.

Under the court’s reading, ensuing loss clauses operate only when the excluded condition results in a distinct covered peril that causes separate loss or damage, and foreseeability remains the “lynchpin” of that analysis; losses which naturally and foreseeably arise from the excluded cause remain excluded. As the third Pennsylvania federal court to cite to the foreseeability framework from the non-precedential Ridgewood opinion, the Stella decision contributes to a growing predictability in Pennsylvania coverage law and provides a consistent analytical framework for evaluating these disputes.

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The opinions expressed are those of the authors and do not necessarily reflect the views of the firm or its clients. This article is for general information purposes and is not intended to be and should not be taken as legal advice.