VAPOR BARRIERS ARE APPROPRIATE IN THE VAST MAJORITY OF COLD INSULATION APPLICATIONS
ARE APPROPRIATE IN THE VAST MAJORITY OF COLD INSULATION APPLICATIONS
An effective Vapor Barrier System can be achieved by (in order of effectiveness/cost):
- Factory-applying a vapor barrier sheet adhered over the insulation, with a Self-seal adhesive lap
- Factory-applying a PermaCast (0.02 perm) coating over fittings (elbows, tees, etc.)
- Field-applying a vapor barrier sheet over the installed insulation, held in place with tape
- Field-applying a zero-perm mastic over fittings/pipe
Additionally, PermaTherm advocates the use of our proprietary PermaCastTM coating, (only available on EPS) factory-applied over fittings such as elbows, tees, etc. PermaCast also significantly reduces field construction costs by eliminating the time-consuming application of layers of mastic and mesh around fittings, waiting for dry-time, and then fabricating a transition to the straight pipe insulation run.