What Is T1-11 Siding — And Why It Fails Over Time
What is T1-11 siding? Popular in the 1970s and ’80s, this plywood or OSB siding was loved for its affordability and rustic look. But its vulnerability to water damage and high maintenance needs caused many homes to suffer rot, peeling, and failure. This guide explains T1-11’s story — and the modern siding materials that outperform it.








