Perms: Difference between revisions
Jump to navigation
Jump to search
(Created page with "Units of permeability. Class 1 vapor barrier - 0.1 perms or less Class 2 - 1 perm Class 3 - 10 perms Built-in barrier in underlayment - can be used instead of dedicated va...") |
No edit summary |
||
| Line 5: | Line 5: | ||
Class 2 - 1 perm | Class 2 - 1 perm | ||
Class 3 - 10 perms | Class 3 - 1-10 perms | ||
Built-in barrier in underlayment - can be used instead of dedicated vapor barrier - [https://www.flooringinc.com/blog/what-is-a-moisture-barrier/] | Built-in barrier in underlayment - can be used instead of dedicated vapor barrier - [https://www.flooringinc.com/blog/what-is-a-moisture-barrier/] | ||
Perm rating - vapor barrier vs vapor retarder. A vapor barrier is a Class 1 vapor retarder. [https://buildingscience.com/documents/digests/bsd-106-understanding-vapor-barriers] | |||