Composition hardboard siding—sometimes marketed under brand names such as Masonite®, Louisiana-Pacific (LP) Inner-Seal®, or Georgia-Pacific® PrimeTrim—was a popular exterior cladding choice from the 1970s through the early 2000s. It offered an affordable, wood-like appearance and easy installation. However, long-term performance problems and numerous product failures have since emerged, leading to lawsuits, recalls, and replacement programs. This paper outlines the composition, failure mechanisms, inspection considerations, and implications for property owners and real-estate stakeholders.
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