Specification History

SWS Version Created Specification ID Title Specification Objective Rationale Status
Version TBD 03/23/2021 - 11:50 4.0401.1f Ignition and thermal barriers

If foam is no more than 3 1/4" thick, is between 0.5 and 2.0 lb/ft3 in density, and has a flame spread/smoke development index of 25/450 or less when tested in accordance with ASTM E84 or UL 723, no thermal barrier is required

If foam is thicker than 3 1/4", does not meet the flame and smoke index, or is not between 0.5 and 2.0 lb/ft3 density, separate foam from the subspace with a suitable thermal barrier covering or coating as indicated in manufacturer's specifications and applicable building code

If code requirements are unclear, consult local code officials for clarification

Minimize ignition and combustion potential

Send to Tony Link to verify the intent of the committee was met by this suggested change. Black Line
Version 2020 08/14/2020 - 14:25 4.0401.1f Ignition and thermal barriers

If foam is no more than 3 1/4" thick and the space is not permanently habitable no thermal barrier is required

If foam is thicker than 3 1/4", doesn't meet the flame and smoke index, or is of less than 0.5 lb/ft3 density, separate foam from the subspace with a suitable thermal barrier covering or coating as indicated in manufacturer's specifications and applicable building code

If code requirements are unclear, consult local code officials for clarification

Minimize ignition and combustion potential

Black Line