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From [Institution name]
| Property | Unit | Requirement |
|---|---|---|
| Thickness | mm | ≥ 1.0 |
| Maximum load (Longitudinal or transverse) | kN/m | ≥ 4.4 |
| Elongation at break of modified bitumen portion | % | ≥ 10 |
| Adhesion to plywood at 4°C | kgf/30.5 cm | ≥ 0.92 |
| Adhesion to plywood at 23°C | kgf/30.5 cm | ≥ 5.44 |
| Thermal stability Specimens at a 45° angle for 14 days at: 95°C |
mm | ≤ 3 |
| Flexibility temperature | °C | −29 (no signs of cracking) |
| Tear resistance ( Longitudinal or transverse) | N | ≥ 89 |
| Moisture vapour permeance | ng/(Pa·s·m 2) | ≤ 5.7 |
| Sealability around nail | – | Pass |
| Waterproof integrity after low temperature flexibility | – | Pass |
| Waterproof integrity of lap seam | – | Pass |
| Slip resistance | – | Greater than asphalt saturated felt when tested under the same conditions of temperature and wetness |
| Unrolling property | – | The underlayment sheet shall not crack nor be so sticky as to cause tearing or other damage upon being unrolled at material temperatures between 4.4°C and 60°C. |