Superstructures: Restoration 101: Why Do Envelopes Fail?
Why? First of all, many of them are antiques. Over time, all buildings become antiques and require restoration to arrest—or reverse—their deterioration.
It’s also important to understand how building envelope components are interconnected. A problem with one assembly often affects other parts of the envelope. Roof leaks can damage adjoining wall assemblies, and compromised parapets can cause damage to roofs.