Historical class-action lawsuits and consumer legal disputes targeting IKO focused primarily on legacy, organic-mat shingle lines from decades past (such as Chateau and Renaissance) that allegedly experienced premature weathering, moisture blistering, curling, and granule loss. Modern fiberglass-mat architectural shingles like IKO Cambridge and Dynasty are manufactured using completely updated polymer-modified asphalt formulations and strict quality controls entirely separate from those legacy disputes.
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