Rationale

FACING INFORMATION-Section 1.3 references Practice C921 which was withdrawn in 2021 and there is an opportunity to include practice C755 for the considerations to be taken for vapor retarders and guide C1423 which provides guidance specific to selecting jacketing materials. The information provided in section 6.2 for facing is outdated and the proposal is included which references C1136 facing materials. The reference to practice C921 is removed from the Referenced Documents listing and the Practice C755 and Guide C1423 are added to the Referenced Documents.