roof deck expansion gap detail

Mitigating Thermal Expansion: Designing Sloped Roof Assemblies for 40°C Thermal Cycles

• September 16, 2026
• admin

In tropical and subtropical regions across the Indian subcontinent, a roof is exposed to severe, continuous thermal cycling. During the dry pre-monsoon months, intense solar radiation drives the surface temperature of dark roofing surfaces to 65°C to 75°C by mid-afternoon. As the sun sets—or when an abrupt monsoon squall sweeps in—the surface can plunge to …