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D371-89 – Standard Test Method Technical Guide
📐 Product Types and Classifications
This specification covers asphalt roll roofing in sheet form, typically 36 in. (914 mm) wide, used as a cap sheet in built-up roofs. The material is classified into four types based on minimum mass per unit area.
| 🏷️ Type | 📏 Min Mass (lb/100 ft²) | 📐 Min Mass (g/m²) |
|---|---|---|
| I | 37.0 | 1806 |
| II | 46.3 | 2260 |
| III | 35.5 | 1733 |
| IV | 42.8 | 2090 |
⚙️ Physical Requirements and Testing
The finished product must not crack or be sticky when unrolled at ambient temperatures above 50°F (10°C). Pliability at 77°F (25°