Rationale

The proposed definition uses the same language as the current definition with revisions approved at subcommittee. The definition is more broadly stated to include the boundary or barrier separating environmentally distinct spaces within the same building – a definition that is more closely aligned with definitions published by other allied organizations such as ASHRAE. More importantly, the proposed definition does not preclude or otherwise undermine the use of the term ‘Building Envelope’ as it currently exists in other ASTM standards as the definition is consistent with what is currently published in E631.