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1405.1.1.1 Ignition Resistance
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Where permitted by Section 1405.1.1, combustible exterior wall coverings shall be tested in accordance with NFPA 268.
Exceptions:
- Wood or wood-based products.
- Other combustible materials covered with an exterior weather covering, other than vinyl sidings, included in and complying with the thickness requirements of Table 1404.2.
- Aluminum having a minimum thickness of 0.019 inch (0.48 mm).
Where installed on exterior walls having a fire separation distance of 5 feet (1524 mm) or less, combustible exterior wall coverings shall not exhibit sustained flaming as defined in NFPA 268.
For fire separation distances greater than 5 feet (1524 mm), any exterior wall covering shall be permitted that has been exposed to a reduced level of incident radiant heat flux in accordance with the NFPA 268 test method without exhibiting sustained flaming. The minimum fire separation distance required for the exterior wall covering shall be determined from Table 1405.1.1.1.2 based on the maximum tolerable level of incident radiant heat flux that does not cause sustained flaming of the exterior wall covering.
| FIRE
SEPARATION
DISTANCE (feet) |
TOLERABLE
LEVEL INCIDENT
RADIANT HEAT ENERGY (kW/m2) |
|---|---|
| 5 | 12.5 |
| 6 | 11.8 |
| 7 | 11.0 |
| 8 | 10.3 |
| 9 | 9.6 |
| 10 | 8.9 |
| 11 | 8.3 |
| 12 | 7.7 |
| 13 | 7.2 |
| 14 | 6.7 |
| 15 | 6.3 |
| 16 | 5.9 |
| 17 | 5.5 |
| 18 | 5.2 |
| 19 | 4.9 |
| 20 | 4.6 |
| 21 | 4.4 |
| 22 | 4.1 |
| 23 | 3.9 |
| 24 | 3.7 |
| 25 | 3.5 |
| — | |
For SI: 1 foot = 304.8 mm, 1 Btu/H2 • °F = 0.0057 kW/m2 • K.
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