Glossary / flame spread

flame spread

How far flame travels across a specimen in ASTM E84. An index is not a Class A roof and is not noncombustible. Oregon ignition-resistant uses an extended run.

Last verified 2026-08-23. JSON (CC BY 4.0)

Also called: flame spread index.

Related

• ignition resistant
• noncombustible
• test method
• siding
• astm-e84
• Ignition-resistant versus noncombustible

Where this term is used

3 guides use this term.

• ASTM E119 versus a WUI wall test
• Ignition-resistant versus noncombustible
• The IWUIC edition on the lot