A comment on the last ballot item for this standard pointed out that Permeance, rather than Permeability would be more appropriate to describe the water vapor transmission properties of the insulation joint adhesive. The task group discussed this and agreed to ballot the change from Permeability to Permeance. An adhesive permeance limit of 0.1 perm (5.7 ng/Pasm2) was agreed upon by the task group.
Date Initiated: 05-20-2019
Technical Contact: Cassandra Popovski
Item: 000
Ballot:
Status: