How do structural silicone and mechanical fixing methods compare for long-term durability of a glass curtain wall?

Structural silicone glazing (SSG) and mechanical fixing are two primary attachment methods for glass curtain walls. SSG offers clean aesthetics with no visible external caps, but it requires precise curing, clean bonding surfaces, and strict QC. Mechanical fixing uses pressure plates or point supports that provide immediate structural restraint and easier inspection. In terms of durability, both systems can perform for decades when properly engineered. However, silicone joints must resist UV exposure, temperature fluctuations, and wind loads. Mechanical systems, while durable, may require periodic gasket replacement. The choice depends on project aesthetics, environmental exposure, engineering requirements, and maintenance considerations.